TITLE 14
HOUSING AND CONSTRUCTION
CHAPTER 7
BUILDING CODES
GENERAL
PART 4 2003 NEW MEXICO EARTHEN BUILDING MATERIALS CODE
14.7.4.1
ISSUING AGENCY: Construction Industries Division of the
Regulation and Licensing Department.
[14.7.4.1 NMAC - Rp, 14.11.11.1 NMAC,
11-19-04]
14.7.4.2 SCOPE: This rule applies to all earthen building materials contracting work performed in New Mexico on or after November 19, 2004, that is subject to the jurisdiction of CID, unless performed pursuant to a permit for which an application was received by CID before that date.
[14.7.4.2 NMAC - Rp, 14.11.11.2 NMAC,
11-19-04]
14.7.4.3 STATUTORY AUTHORITY: NMSA 1978 Section 60-13-9 and 60-13-44.
[14.7.4.3 NMAC - Rp, 14.11.11.3 NMAC,
11-19-04]
14.7.4.4 DURATION: Permanent.
[14.7.4.4 NMAC - Rp, 14.11.11.4 NMAC,
11-19-04]
14.7.4.5 EFFECTIVE DATE: November 19, 2004, unless a later date is cited at the end of a section.
[14.7.4.5 NMAC - Rp, 14.11.11.5 NMAC,
11-19-04]
14.7.4.6 OBJECTIVE: The purpose of this rule is to establish minimum standards for earthen building materials construction in New Mexico.
[14.7.4.6 NMAC - Rp, 14.11.11.6 NMAC,
11-19-04]
14.7.4.7
DEFINITIONS:
A.
Amended soil means improving an unqualified soil to a qualified state
with the addition of other soils or amendments.
B.
Amendments means additive elements to soil, such as lime, portland
cement, fly ash, etc. which are dry-mixed into the main soil body as a
percentage of total weight to achieve stabilization.
C.
Buttress means a projecting structure providing lateral support to a
wall. The buttress shall be
incorporated into the foundation and wall system. (Refer to figure 1 of the earthen building materials
auxiliary workbook, hereafter
referred to as workbook
D. CEB means compressed earth block.
E.
Keyway means a groove on the vertical rammed earth wall surface for
interlocking purposes. Refer to
figure 3.
F.
Lift means a course of rammed earth, placed within the
forms, and then compacted.
G.
Nailer means any material rammed into the wall that serves as an
attachment device. Refer to figure
4.
H.
Optimum moisture means sufficient water (generally no more than ten
(10) percent) mixed into the soil to attain sufficient
compaction.
I.
psi means pounds per square inch.
J.
Qualified soil means any soil, or mixture of soils, that attains 300
psi compression strength and attains 50 psi. modulus of
rupture.
K.
Rammed earth means qualified
soil that is mechanically or manually consolidated to full
compaction.
L.
Stabilization, stabilized means qualified soils that pass the wet
strength test under ASTM D1633-00 or contain a minimum of six (6) percent
portland cement by weight.
Stabilization is achieved through the use of
amendments.
M.
Wet strength compression test means an approved testing laboratory
process in which a fully cured rammed earth cylinder is
completely submerged in water a minimum of four hours according to ASTM
D1633-00, then subjected to a compression test.
[14.7.4.7 NMAC - Rp, 14.11.11.7 NMAC,
11-19-04]
14.7.4.8
EARTHEN
BUILDING MATERIALS:
A. General. The provisions of this rule, 14.7.4 NMAC, shall control the design and construction of one- and two-family dwellings in which earthen building materials form the bearing wall system.
B. Allowable wall heights for earthen structures. All earthen structures whether adobe, burned adobe, compressed earth block, rammed earth or terrσn, shall conform to table 1. For purposes of using table 1, height is defined as the distance from the top of the slab or top of stem wall to the underside of the bond beam.
Table 1- ALLOWABLE WALL HEIGHTS FOR
EARTHEN
STRUCTURES | |||||
Maximum Sds |
Wall Thickness |
Maximum Height |
Maximum Sds |
Wall Thickness |
Maximum
Height |
.25 |
10 |
120 |
.3 |
10 |
120 |
12 |
128 |
12 |
128 | ||
14 |
144 |
14 |
144 | ||
16 |
144 |
16 |
144 | ||
18 |
144 |
18 |
144 | ||
24 |
144 |
24 |
144 | ||
.35 |
10 |
120 |
.4 |
10 |
120 |
12 |
128 |
12 |
128 | ||
14 |
144 |
14 |
144 | ||
16 |
144 |
16 |
144 | ||
18 |
144 |
18 |
144 | ||
24 |
144 |
24 |
144 | ||
.45 |
10 |
104 |
.5 |
10 |
96 |
12 |
128 |
12 |
112 | ||
14 |
144 |
14 |
136 | ||
16 |
144 |
16 |
144 | ||
18 |
144 |
18 |
144 | ||
24 |
144 |
24 |
144 | ||
This table is
based on two story maximum, one and two family residential with seismic
soil site class D1. |
[14.7.4.8 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.9
ADOBE CONSTRUCTION:
A.
General. Adobe shall not be used in any building more
than (2) stories in height. The
maximum height of every wall of adobe block without lateral
support is specified in 14.7.4.8 NMAC, table 1. The height of the wall is defined as the
distance from the top of the slab or top of stem wall to the underside of the
bond beam. The maximum height of
exterior walls, which are laterally supported with those supports located no
more than twenty-four (24) feet apart, are as defined in 14.7.4.8 NMAC, table
1. The bottom story of a two-story
is allowed a minimum thickness of fourteen (14) inches with the upper story
allowed a thickness of ten (10) inches providing the structure meets the
provisions of 14.7.4.8 NMAC, table 1.
B.
Fireplaces. Adobe or
masonry fireplaces and chimneys in adobe structures shall comply with 14.7.3.18
NMAC. They shall be integrated into
adjacent adobe walls during construction or secured to them by suitable steel
ladder reinforcement or reinforcing rods.
C.
Count Rumford fireplaces.
Count Rumford fireplaces are allowed as provided in 14.7.3.18
NMAC.
D.
Soil. Soil for use in
adobe blocks should
have a mixture of coarse sand, sand, silt and clay, naturally occurring, or
amended with sand or straw, that will make a sun-dried brick without serious
warping or cracking. The best way
to determine the fitness of a soil is to make sample blocks and allow them to
cure in the open, protected from moisture.
Then test as specified by Subsections C and D of 14.7.4.11 NMAC. The soil shall not contain more than two
(2) percent soluble salts.
[14.7.4.9 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.10
CLASSES OF ADOBE:
A.
Stabilized adobe. The term stabilized is defined to mean
water-resistant adobe made of soil to which certain admixtures are added in the
manufacturing process in order to limit water absorption into the adobe. Exterior walls constructed of stabilized
mortar and adobe requires no additional protection. Cement stucco or other waterproof
coating is not required. The test
required is that a dried four (4) inch cube cut from a sample unit shall not
gain more than 2.5% in weight when placed upon a constantly water-saturated
porous surface for seven (7) days.
An adobe unit that meets this specification shall be considered
stabilized.
B.
Unstabilized adobe.
Unstabilized or natural adobes are adobes that do not meet the water
absorption specifications indicated in Subsection A of 14.7.4.10 NMAC
above. Use of unstabilized adobes
is prohibited within four (4) inches of the finished floor grade. Stabilized adobe or waterproof masonry
units and mortar may be used for the first four (4) inches above floor
grade.
C.
Terrσn. The term
Terrσn shall refer to a cut sod brick.
Their use is permitted if units are dry and the wall design is in
conformance with this code.
D.
Burned adobe. The term
burned adobe shall refer to mud adobe bricks that have been cured by
low-temperature kiln firing. This
type of adobe is not generally dense enough to be frostproof and may
deteriorate with seasonal freeze-thaw cycles. Its use for exterior locations is
discouraged in climate zones with daily freeze-thaw cycles.
[14.7.4.10 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.11
PROPERTIES, SAMPLING AND TESTING:
A.
General. Each of the
tests prescribed in this section shall be applied to sample units selected at
random at a ratio of five (5) units per twenty-five thousand (25,000) bricks to
be used or at the discretion of the building official.
B.
Shrinkage cracks.
Shrinkage cracks are allowed, providing that these cracks do not
jeopardize the structural integrity of the blocks.
C. Compressive strength.
(1) Cured units shall have
an average minimum compressive strength of three hundred (300) pounds per square
inch when tested. One (1) sample
out of five (5) may have a compressive strength of not less than two hundred
fifty (250) psi.
(2)
The adobe block shall be tested in
the flat position. The length of
the test unit must be a minimum of twice the width. The surfaces must be smooth. The test unit shall be subjected to a
uniform compressive load that is gradually increased at a rate of five hundred
(500) psi./minute until failure occurs.
A true platen should be used in the testing machine, along with swivel
head to accommodate nonparallel bearing surfaces. The compressive strength is defined as
P/A, where P= load and A = area of compression surface.
D.
Modulus of rupture.
Cured units shall average fifty (50) psi in modulus of rupture when
tested according to the following procedures. A cured unit shall be laid over two-inch
(2) diameter cylindrical supports two (2) inches from each end and extending
across the full width of the unit.
A cylinder two (2) inches in diameter shall be laid midway between and
parallel to the supports. Load
shall be applied to the cylinder at a rate of five hundred (500) psi/minute
until rupture occurs. The modulus
of rupture is equal to: 3PL/2bt2
(P=rupture load
in pounds, L=span between supports, b=width of block, t=thickness of
block)
.
E.
Mortar. The use of earth mortar is allowed if
the earth mortar
material is of the same type as the adobe blocks. Conventional lime/sand/cement mortars of
types M, S, and N are also allowed.
Mortar bedding joints shall be fully grouted, with partially open
head joints allowable if the surface is to be plastered. All joints shall be lapped at least
twenty-five (25) percent of the visible block
length.
F.
Use. No adobe shall be
laid in the wall until fully cured.
G.
Foundations. Adobes may
not be used for foundations or basement walls. All adobe walls, except as noted under
group M buildings, shall have a continuous footing at least eight (8) inches
thick and not less than two (2) inches wider on each side that supports the
foundation stem walls above. All
foundation stem walls that support adobe units shall extend to an elevation not
less than six (6) inches above the finish grade. Foundation stem walls shall be at least
as thick as the adobe walls they support.
Where perimeter insulation is used, a variance is allowed for the stem
wall width to be two (2) inches narrower than the width of the adobe wall it
supports. Alternative foundation
systems must be approved by the building official.
H.
Bond beams. All bearing
walls shall be topped with a continuous bond beam (except patio walls less than
six (6) feet high above stem). All
bond beam construction shall be in accordance with accepted engineering
practices.
I.
Concrete bond beam.
Concrete bond beams shall be a minimum of six (6) inches high by ten (10)
inches wide for walls up to fourteen (14) inches thick. Where adobe walls are wider than one
course, two-thirds (2/3) of each visible course top shall be covered by the
concrete bond beam. All concrete
bond beams shall be reinforced with a minimum of two (2) no. 4 reinforcing rods
at each floor and ceiling plate line.
J.
Wood bond beam. Wood
bond beams shall be a minimum of six (6) inches deep by ten (10) inches wide for
walls up to fourteen (14) inches thick.
Where adobe walls are wider than one course, two-thirds (2/3) of each
visible course top shall be covered by a wood bond beam and the roof load shall
be distributed over both bond beams.
Wood bond beams may be solid in the six-inch (6) dimension, or may be
built up by applying layers of lumber.
Ends of wood bond beams are to be lapped a minimum of the width of the
wall and fully nailed. No wood
layer shall be less than one (1) inch nominal thickness. The building official shall approve all
wooden bond beams for walls wider than fourteen (14)
inches.
K.
Lintels. Lintels of wood
or concrete are allowed. When an
engineers drawing and seal is not provided, all lintels shall conform to table
2 or 3 below. The required bearing
of any lintel shall not be reduced by a splayed or angled window or door
opening.
L.
Wood lintels. When an
engineers drawing and seal is not provided for lintels, all wood lintels
shall conform to table 2 and have a fiber stress rating of at least 850
psi.
Table 2 adobe Wall Wood Lintel Schedule | ||||
MINIMUM FIBER STRESS 850
psi | ||||
Wall Width |
Max. Span |
Size |
Bearing length on earth wall |
Load Capacity |
10 |
4'-0 |
10 x 6 |
12 |
860 PLF |
6'-0 |
10 x 8 |
12 |
1020 PLF | |
8'-0 |
10 x 10 |
18 |
1150 PLF | |
10'-0 |
10 x 12 |
24 |
1000 PLF | |
12'-0 |
10 x 14 |
24 |
1000 PLF | |
12 |
4'-0 |
10 x 6 |
12 |
860 PLF |
6'-0 |
10 x 8 |
12 |
1020 PLF | |
8'-0 |
10 x 10 |
18 |
1150 PLF | |
10'-0 |
10 x 12 |
24 |
1000 PLF | |
12'-0 |
10 x 14 |
24 |
1000 PLF | |
14 |
4'-0 |
12 x 6 |
12 |
950 PLF |
6'-0 |
12 x 8 |
12 |
1150 PLF | |
8'-0 |
12 x 10 |
18 |
1300 PLF | |
10'-0 |
12 x 12 |
24 |
1300 PLF | |
12'-0 |
12 x 14 |
24 |
1200
PLF |
M.
Concrete lintels. When an engineers drawing and seal is
not provided for lintels, all concrete lintels shall conform to table 3 and have
a minimum strength of 3000 psi.
Table 3 ADOBE WALL CONCRETE LINTEL SCHEDULE MIN. 3000 psi | ||||
Maximum Span |
Minimum depth * |
Reinforcing |
Maximum Capacity per linear foot |
Bearing
length on earth
wall |
Less than 6 -
0 |
8 |
2 - # 4 |
1500 lbs. |
12 |
6' - 0" to 10' -
0 |
12 |
3 - # 5 |
1500 lbs. |
18 |
11' - 0" to 16'-
0 |
16 |
3 - # 6 |
1500 lbs. |
24 |
* SIZE - Wall width X depth of
lintel |
N.
Anchorage. Roof and floor structures will be
suitably anchored to bond beams.
Wood joists, vigas or beams shall be attached to the wood or concrete
bond beams with adequate metal fasteners.
Door and window bucks shall be secured to the adobe wall with adequate
metal fasteners. Gringo blocks or wood nailers,
placed in the adobe walls as they are laid up, are allowed. Wood and metal partitions may be secured
to nailing blocks
laid up in the adobe wall or by other approved methods.
O.
Plastering. Unstabilized
exterior adobe walls can be protected with portland cement plaster with a
minimum thickness of seven-eighths (7/8) inch, if adequate roof, parapet, canal
and window flashing is provided. If
portland cement plaster is used, it must be reinforced with metal wire mesh,
minimum seventeen (17) gauge by one-and-a-half (1 1/2) inch openings, securely
attached to the exterior adobe wall surface by nails or staples with a minimum
penetration of one-and-a-half (1 1/2) inch. Such mesh fasteners shall have a maximum
spacing sixteen (16) inches from each other. Any wood surfaces to be covered with
stucco or plaster must be protected from moisture with asphalt felt, reinforced
with expanded metal lath.
Protective coatings other than plaster are allowed. Interior gypsum or mud plasters may be
applied directly to the wall, provided that adobe head joints have been left
partially open. Expanded metal lath
shall be used around window and door openings. If desired, exterior adobe walls may be
protected with mud plaster.
Alternative plastering systems shall be submitted for approval by the
building official.
P.
Wall insulation. All
methods of wall insulation shall comply with the manufacturers
recommendations.
[14.7.4.11 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.12
RAMMED EARTH
CONSTRUCTION:
A.
General. The following
provisions shall apply.
(1) Rammed earth shall not be used in
any building more than (2) stories in height. The height of every wall of rammed earth without lateral
support is specified in 14.7.4.8 NMAC table 1. The height of the wall is defined as the
distance from the top of the slab or top of stem wall to the underside of the
bond beam.
(2) Exterior rammed earth walls shall be a
minimum of eighteen (18) inches in thickness.
(3) Interior rammed earth walls shall be a
minimum of twelve (12) inches in thickness.
(4) Unstabilized rammed
earth walls must be
covered to prevent infiltration of moisture from the top of the wall at the end
of each workday and prior to wet weather conditions, whether the walls are contained within forms or
not.
(5) Fully stabilized
rammed earth walls
may be left unprotected from the elements.
(6) In no case shall a
rammed earth wall be
reduced in thickness with back to back channels or nailers. Channels or nailers rammed on both sides
of a running wall shall not be opposite each other to avoid an hourglass
configuration in the wall section.
Channels or nailers on both sides of a running wall shall be separated
from each other vertically at a distance no less than the rammed earth wall thickness. (Refer to figure 4 of the
workbook.)
(7) An architect or
engineer registered in the state of New Mexico shall design and seal structural
portions of two-story residential rammed earth construction
documents.
(8) The general
construction of the building shall comply with all provisions of the 2003 New
Mexico Residential Building Code (NMRBC), unless
otherwise provided for in this rule.
B.
Fireplaces. Adobe or
masonry fireplaces and chimneys in rammed earth structures shall
comply with 14.7.3.18 NMAC. They
shall be integrated into adjacent rammed earth walls during
construction or secured to them by suitable steel ladder reinforcement or
reinforcing rods.
C.
Count Rumford fireplaces.
Count Rumford fireplaces are allowed as provided in 14.7.3.18
NMAC.
D.
Stop work. The building
inspector shall have the authority to issue a stop work order if the
provisions of this section are not complied with.
E.
Lateral support. Lateral
support shall occur at intervals not to exceed twenty-four (24) feet. Rammed earth walls eighteen (18)
inches to less than twenty-four (24) inches thick shall be laterally supported
with any one or combination of the following: A rammed earth wall of bond beam
height that intersects the running wall with at least sixty 60 degrees of
support (refer to a figure 5 of the workbook.); an adobe wall of bond beam
height and at least fourteen (14) inches in width that intersects with and
attaches to the running wall with at least sixty (60) degrees of support (refer
to figure 5 of the workbook.); a minimum 20 gauge steel frame or wood frame wall
of full height that intersects with and attaches to the running wall with ninety
(90) degrees of support, that is properly cross-braced or sheathed (refer to
figure 6 of the workbook); a buttress configuration that intersects the running
wall at (90) degrees, of adobe or rammed earth. The buttress base must project a minimum
of three (3) feet (or thirty-three (33) percent of the wall height) from the
running wall and support at least seventy-five (75) percent of the total wall
height (refer to figure 7 of the workbook.) The thickness of a rammed earth buttress shall be at
least eighteen (18) inches. The
thickness of an adobe buttress shall be a minimum fourteen (14) inches. Rammed earth walls greater than
twenty-four (24) inches in thickness are self-buttressing and do not require
lateral support provided their design adheres to 14.7.4.8 NMAC table 1 and the
other applicable provisions of this rule.
F.
Openings. Door and
window openings shall be designed such that the opening shall not be any closer
to an outside corner of the structure as follows:
(1) In rammed earth walls eighteen (18)
inches to less than twenty-four (24) inches thick, openings shall not be located
within three (3) feet of any corner of the structure. (Refer to figure 8 of the
workbook.)
Exception: Openings may be located within three (3) feet
of any corner provided a buttress extending at least three (3) feet from the
structure supports the corner. A
continuous footing below and a continuous bond beam above, shall be provided
across such openings.
(2) Rammed earth walls greater than
twenty-four (24) inches thick are self-buttressing, with no special
consideration for placement of openings within the area of the
wall.
G.
Piers. Rammed earth piers supporting
openings shall measure no less than three (3) square feet in area and no
dimension shall be less than eighteen (18) inches. (Refer to figures 9-A and 9-B
of the workbook.)
[14.7.4.12 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.13
FOUNDATIONS:
A.
General. Foundation
construction shall comply with applicable provisions of the 2003 New Mexico
Residential Building Code, and the
following: A minimum of three (3)
continuous #4 reinforcing rods are required in minimum 2500 psi. concrete
footings supporting rammed earth walls. Stem walls shall be the full width of
the wall supported above or wider to receive forming systems. Footings shall be a minimum of ten (10)
inches in depth.
B.
Perimeter insulation.
For the purposes of placement of perimeter insulation, rammed earth walls may overhang
the bearing surface up to the thickness of the perimeter insulation, but in no
case greater than two (2) inches.
C.
Keyway. A key way shall
be provided where the rammed earth wall meets the
foundation system. The keyway shall
be established at the top of the stem a minimum of two (2) inches deep by six
(6) inches wide formed at the time of the pour, and shall run continuously
around the structure to include any intersecting rammed earth wall sections. The rammed earth wall shall be fully
rammed into this keyway (refer to figure 2) Exception: Placement of vertical reinforcing
rods extending a minimum twelve (12) inches into the rammed earth wall. The vertical rods shall be minimum #4,
imbedded into the concrete and spaced forty-eighty (48) inches on center,
maximum.
D.
Concrete grade beam.
Rubble filled foundation trench designs with a reinforced concrete grade
beam above are allowed to support rammed earth wall
construction. An architect or
engineer registered in the state of New Mexico shall certify the grade
beam/rubble-filled trench design portion.
[14.7.4.13 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.14
RAMMED EARTH
SOIL SPECIFICATIONS:
A.
General. The soil shall
not contain rock more than one-and-a-half (1 1/2) inch in diameter. The soil shall not contain clay lumps
more than one-half (1/2) inch in diameter.
The soil shall be free of all organic matter. The soil shall not contain more than two
(2) percent soluble salts.
B.
Soil compressive strength.
Prior to the start of construction, fully-cured rammed earth soil samples shall
be tested at an approved testing laboratory for compressive strength. The ultimate compressive strength of all
rammed earth soil,
stabilized or non-stabilized, shall be a minimum three-hundred (300) psi. The compressive strength report shall be
submitted with the permit application.
This report may be waived if the builder provides certification of
compliance. The certification must
be dated within one year of the date on the application for the building
permit. Samples tested shall be
representative of soil to be used on the project for which the permit
application is submitted.
C.
Stabilized rammed earth soil. The following shall apply to
stabilization of rammed earth soil: Asphalt emulsion may not be used for
stabilization of rammed earth soil. Thorough mixing of additives to the soil
may be achieved by any method that assures a complete blending to a uniform
color and texture. Stabilized soil
is suitable soil that contains six (6) percent or more portland cement by weight
or that passes ASTM D1633-00.
Samples tested shall be representative of soil to be used on the project
for which the permit application is submitted. The compressive strength report shall be
submitted with the permit application.
Laboratory testing shall indicate rammed earth samples attained a
minimum of two-hundred (200) psi. after seven (7) days. If a different soil is provided at any
time during construction, it must meet the minimum requirements outlined above,
prior to use in the structure.
D.
Unstabilized rammed earth soil. Unstabilized rammed earth soil is that
containing less than six (6) percent portland cement by weight or that fails to
pass ASTM D1633-00. The exterior of
such walls shall be protected with approved stucco systems or other method
approved by the building official.
Refer to 14.7.4.19 NMAC for weather-resistive barrier
requirements.
E.
Amended soil. The
following guidelines shall apply when amending soils to attain a qualified
soil. Soil shall not contain rock
greater than one-and-a-half (1 1/2) inch in diameter. Soil shall not contain clay lumps
greater than one-half (1/2) inch diameter.
Soil shall be free of organic matter. Soil shall not contain more than two (2)
percent soluble salts. Soils to be
mixed shall be sufficiently dry to blend completely to one uniform color and
texture. The amended soil shall be
tested prior to use as per Subsection B of 14.7.4.14 NMAC.
F.
Forming systems. The
forming system shall be adequate to contain the material under compaction. It shall be properly plumbed and braced
to withstand the soil pressures as well as construction activity on and around
it.
G.
Placement of material, compaction and curing.
(1) No amount of portland
cement stabilized soil will be mixed that will not be placed in the wall system
within sixty (60) minutes of its preparation.
(2) Lifts of prepared soil
shall be placed in the forms in relatively even layers not to exceed 8 inches in
depth. Each lift shall then be
rammed to full compaction.
(3) Optimum moisture
content as determined to meet minimum compressive strength shall be maintained
for stabilized and unstabilized walls.
(4) Work will progress,
lift-by-lift, until the work approaches bond beam height.
(5) Forms may be stripped
immediately after ramming is completed for a section of wall, providing ramming
of adjacent sections does not affect the structural integrity of completed
walls.
(6) Portland cement
stabilized walls not in forms shall be lightly spray-cured with water at least
five (5) spaced times during daylight hours. This procedure shall continue for at
least three (3) days starting from the time that the wall is exposed to the
elements.
Exception: Rammed
earth walls left in
forms three (3) or more days shall not require water-spray
curing.
H.
Placement of attachment materials.
(1) Nailers: Nailers incorporated into the rammed
earth wall shall be
installed as follows (Refer to figure 4 of the workbook.): The rammed earth wall shall not be
reduced in thickness with back-to-back nailers. To avoid an hourglass configuration in
the wall section, nailers on either side of a running wall shall not be opposite
each other. Nailers on either side
of a running wall shall be separated from each other vertically a distance not
less than the rammed earth wall thickness. Nailers shall be placed onto the wall
such that the narrow dimension of the nailer is exposed on the race of the wall
prior to ramming. Nailers shall be
cured and sealed against moisture penetration prior to installation in
forms. The nailers shall not extend
the full depth of the wall. Box
wood nailers are not allowed. (Refer to figure 11 of the workbook.) The nailer shall be no more than two (2)
inches by four (4) inches by its length.
(2) Channels: Channels may be incorporated into the
rammed earth wall as
follows (Refer to figure 2 of the workbook.): To avoid an hourglass configuration in
the wall section, channels on either side of a running wall shall not be
opposite each other. (Refer to figure 4 of the workbook.) Channels shall be no more than two (2)
inches by four (4) inches by their length in dimension. Vertical channels shall not be placed
closer than twelve (12) inches to a rammed earth wall finished edge
or corner.
[14.7.4.14 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.15
NICHOS OR OTHER SHAPED VOIDS:
A.
General. The depth of voids shall not exceed 8
inches. The width of the void shall
be as defined in Subsections B and C of 14.7.4.15 NMAC
below.
B.
Voids in stabilized rammed earth walls. Voids shall not exceed two (2) feet in
width. Voids greater than two (2)
feet in width require a lintel or half-circle arched opening. Refer to 14.7.4.18 NMAC for lintel
requirements.
C.
Voids in unstabilized rammed earth walls. Voids shall not exceed one (1) foot
in width. Voids greater than one
(1) foot in width require a lintel or half-circle arched opening of stabilized
rammed earth
material. Refer to 14.7.4.18 NMAC
for lintel requirements.
[14.7.4.15 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.16
ATTACHMENTS AND CONNECTIONS:
A.
General. Attachment and connection methods of
alternate wall construction to rammed earth walls are described
as follows. The building official
may approve other attachment and connection methods. In no case shall two wall types be
butted to each other without consideration for attachment or
connection.
B.
Attachment of a rammed earth wall to a rammed
earth wall. A keyway, at least six (6) inches
wide by three (3) inches deep shall be formed vertically at the center of the
wall section from stem top to underside of bond beam. The connecting wall shall be rammed into
the keyway. (Refer to figure 3 of the workbook.)
C.
Attachment of a load-bearing adobe wall to a rammed earth wall. Where adobe is deployed as an interior
wall that will be incorporated into the rammed earth wall for lateral
support, the adobe shall measure a minimum of ten (10) inches in thickness. Steel ladder reinforcement shall be
rammed into the wall at the intersection with the adobe wall. The reinforcement may be bent against
the forms during the ramming process.
After ramming is complete and forms removed, the reinforcement shall be
incorporated into the adjoining adobe coursing, every four (4) courses minimum.
(Refer to figure 12 of the workbook.)
As an alternative, a keyway, not to exceed the depth of the adobe wall,
nor one-third (1/3) the depth of the rammed earth wall, shall be
formed into the rammed earth wall. The adobe shall be incorporated into the
keyway. (Refer to figure 13 of the workbook.)
D.
Attachment of a loadbearing wood or steel frame wall to a rammed earth wall. A half-inch (1/2) minimum diameter
anchor bolt with four (4) inch hook, set in a linear vertical pattern, a maximum
of twenty-four (24) inches on-center.
The anchor bolt shall be embedded at least twelve (12) inches into the
earth wall with the
threaded end protruding sufficiently to pass through and attach the adjoining
vertical wall stud. The washer and
nut shall be tightened just prior to sheathing the frame wall. As an alternative, eighteen (18) gauge
by two (2) inch minimum galvanized strap tie, grouted into the concrete bond
beam (or secured to the wood bond beam or wood top plate), securely nailed to
the top plate of the frame wall.
The remainder of the vertical stud shall be attached to the rammed earth wall with thirty-D
(30D) nails or screws embedded a minimum of three (3) inches into the adjacent
wall at eight (8) inches on center vertically. (Refer to figure 14 of the
workbook.)
E.
Attachment of a door or window unit to a rammed earth wall. The unit shall be attached to
nailers within the opening or nailed or screwed directly into the rammed earth wall. The nail or screw shall penetrate at
least three (3) inches into the rammed earth wall. Heavier units may utilize stronger
attachments, such as anchor bolts, T-bolts, steel pins, etc., embedded into the
rammed earth
wall.
F.
Attachment of rigid insulation to a rammed earth wall. Round-cap nails shall be used to attach
rigid insulation board up to two (2) inches in thickness to the rammed earth wall. When attaching rigid insulation board
greater than two (2) inches in thickness to the rammed earth wall, galvanized
round-cap nails shall penetrate at least a three (3) inch minimum into the
wall.
G.
Attachment of cabinetry to a rammed earth wall. Deck screws shall penetrate a minimum of
three (3) inches through cabinetry and into a nailer, eight (8) inches on center
maximum, or; deck screws with a least three (3) inch minimum penetration through
cabinetry and into the rammed earth wall. Screws shall be placed horizontally,
eight (8) inches on center maximum, on the top and bottom of cabinetry. As an alternative, all-thread rods or
other attachment devices, suitable for attachment of cabinetry through the
rammed earth
wall.
H.
Attachment of concrete bond beam to a rammed earth wall. Number four (4) reinforcing bar
shall be driven into the uncured wall top.
The reinforcing bar shall be set at a maximum twenty degree (20o) angle
along both edges of the wall, staggered no more than twenty-four (24) inches
on-center and no closer than four (4) inches from the exterior faces of the
wall. The reinforcing bar shall
extend a minimum of twelve (12) inches into the rammed earth wall and four (4)
inches into the concrete bond beam. (Refer to figure 16 of the
workbook.)
I.
Attachment of wood bond beam to a rammed earth wall. One-half (1/2) inch anchor bolts with
four (4) inch base hooks shall be rammed into the wall. The bolts shall be staggered a maximum
of forty-eight (48) inches on-center along both edges of the wall, staggered no
closer than six (6) inches from the exterior faces of the wall. The bolt shall extend a minimum of
eighteen (18) inches into the rammed earth
wall.
[14.7.4.16 NMAC - Rp, 14.11.11.8 NMAC, N,
11-19-04]
14.7.4.17
BOND BEAMS:
A.
General. The bond beam
shall be secured to the rammed earth wall. Refer to Subsections H and I of
14.7.4.16 NMAC above. Bond beams
may be of wood or concrete construction.
Bond beams shall measure six (6) inches nominal depth and extend the full
width of the wall.
Exception: The bond
beam width may be reduced as follows:
Two (2) inches maximum in an eighteen (18) to less than twenty-four (24)
inch thick rammed earth wall, or three (3)
inches maximum in a rammed earth wall twenty-four
(24) inches or greater in thickness.
Bond beams must be continuous, running the full perimeter of the
structure. Interior rammed earth or adobe walls shall
be incorporated into the bond beam.
Varying height bond beams shall extend into the adjoining rammed earth wall one-half (1/2)
the thickness of the adjoining rammed earth wall. The concrete bond beam may secure
anchoring and strapping devices.
B.
Wood bond beam construction.
In addition to the general requirements of Subsection A of 14.7.4.17
NMAC, wood bond beams may be constructed as approved by the building official.
Light wood bond beam construction may be utilized as shown in figure 10 of the
workbook.
C.
Concrete bond beam construction. In addition to the general requirements
of Subsection A of 14.7.4.17 NMAC, concrete bond beams shall be constructed of
minimum twenty-five hundred (2500) psi. concrete and shall contain steel
reinforcement as follows: For
eighteen (18) to less than twenty-four (24) inch thick rammed earth wall construction, a
minimum of two (2) continuous number four (4) reinforcing rods shall be
used. For walls equal to or greater
than twenty-four (24) inches in thickness, a minimum of two (2) continuous
number five (5) reinforcing rods shall be used. Provide two (2) inch minimum
reinforcement concrete cover over all horizontal reinforcing rods. Concrete bond beams may be used to
secure anchoring and strapping devices.
D.
Concrete bond beam cold joints.
Concrete bond beam cold joints are limited to corners of perpendicular
intersections with other structural, full-height walls. Cold joints shall be tied into the
adjoining bond beam with three (3) number four (4) reinforcing rods. The reinforcement shall extend a minimum
of twenty-four (24) inches into both portions of the concrete bond
beam.
[14.7.4.17 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.18
LINTELS OVER OPENINGS:
A.
General. All openings require a lintel or
semi-circular arch over the opening.
All lintels, whether of wood or concrete shall bear a minimum of twelve
(12) inches into the length of the wall.
Exception: Nichos and
other shaped voids as defined in 14.7.4.15 NMAC.
B.
Bearing limitations.
Lintels shall bear a minimum of twelve (12) inches beyond coved, splayed
or rounded bearing portions of openings that are less than the full width of the
wall. (Refer to figure 15 of the workbook.)
C.
Lintels over openings in stabilized rammed earth walls. Openings less than twenty-four (24)
inches in width shall not require a lintel or semi-circular arched opening. Openings greater than twenty-four (24)
inches in width require lintels as defined in table 4.
Table 4 Concrete Lintels
Over Openings in Rammed Earth Walls
[1] | |||||
Wall
width |
Lintel
span |
Lintel
depth |
Reinforcement [2] |
Reinforcement Concrete Cover [3] |
Uniform
Load |
18 |
24 |
6 |
3- #4 @
4o.c. |
3 minimum concrete cover on all
sides |
1000 PLF |
36 |
6 |
3- #4 @
4o.c. | |||
48 |
6 |
3- #4 @
4o.c. | |||
60 |
6 |
3- #4 @
4o.c. | |||
72 |
8 |
3- #5 @
4o.c. | |||
84 |
8 |
3- #5 @
4o.c. | |||
96 |
8 |
3- #5 @
4o.c. | |||
20 |
24 |
6 |
3- #4 @
4o.c. |
4 minimum concrete cover on all
sides |
1350 PLF |
36 |
6 |
3- #4 @
4o.c. | |||
48 |
6 |
3- #4 @
4o.c. | |||
60 |
6 |
3- #4 @
4o.c. | |||
72 |
8 |
3- #5 @
4o.c. | |||
84 |
8 |
3- #5 @
4o.c. | |||
96 |
10 |
3- #5 @
4o.c. | |||
22 |
24 |
6 |
3- #4 @
5o.c. |
3 1/2 minimum concrete cover on all
sides |
1700 PLF |
36 |
6 |
3- #4 @
5o.c. | |||
48 |
6 |
3- #4 @
5o.c. | |||
60 |
6 |
3- #4 @
5o.c. | |||
72 |
8 |
3- #5 @
5o.c. | |||
84 |
10 |
3- #5 @
5o.c. | |||
96 |
10 |
3- #5 @
5o.c. | |||
24 |
24 |
6 |
3- #4 @
6o.c. |
3 minimum concrete cover on all
sides |
2000 PLF |
36 |
6 |
3- #4 @
6o.c. | |||
48 |
6 |
3- #4 @
6o.c. | |||
60 |
6 |
3- #4 @
6o.c. | |||
72 |
8 |
3- #5 @
6o.c. | |||
84 |
10 |
3- #5 @
6o.c. | |||
96 |
12 |
3- #5 @
6o.c. |
[14.7.4.18 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
[1.
3000 psi minimum concrete at approximately 28 days. 2.
Grade 40 steel reinforcement minimum. 3.
Steel reinforcement at mid-depth of lintel.]
14.7.4.19
WEATHER RESISTIVE BARRIERS:
A.
General. Stabilized rammed earth walls do not require
a weather-resistive barrier or an approved exterior finish. Unstabilized rammed earth walls require a
weather-resistive barrier and approved exterior finish. When a vapor barrier is installed over
the rammed earth
wall, it shall not be installed on both sides of a rammed earth wall system. Exception: On the top and sides of a parapet
wall.
B.
Moisture barrier locations.
A moisture barrier shall protect rammed earth walls adjacent to
bath and shower enclosures. A
moisture barrier shall protect rammed earth walls at window
sills, the top of the parapet, or other exterior wall portions exposed to the
elements. A moisture barrier
installed over an exposed parapet top of a rammed earth wall shall lap a
minimum of six (6) inches down both sides of the parapet
top.
[14.7.4.19 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.20
LATH AND PLASTER:
A.
General. When
non-cementious plasters are applied directly to the rammed earth wall surface, the
surface shall be scored or sandblasted prior to the application of the
plaster. Rammed earth walls must cure to a
depth of four (4) inches minimum prior to application of an approved exterior
finish.
B.
Lath. Where rammed earth walls have a plaster
finish, metal lath shall be installed around interior and exterior wall openings
and over dissimilar materials.
C.
Exterior plaster. In
unstabilized rammed earth walls, stucco
netting shall be installed and cementious plaster shall have a minimum
seven-eighths (7/8) inch finished thickness, unless an elastomeric color coat
is used, then it shall have a minimum base coat of five-eighths (5/8) inch. Applications shall follow the material
manufacturers specifications.
[14.7.4.20 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.21
PLUMBING:
A.
General. Code compliant plumbing
systems may be rammed into the wall system, either vertically or horizontally,
provided that such plumbing material is of sufficient strength to withstand the
ramming pressures without any rupture or collapse.
B.
Plumbing system installation.
Installations shall not reduce the width of the rammed earth wall by more than
one-third (1/3). Prior to ramming,
a minimum five (5) inch earth cover is provided
over any horizontal pipe.
[14.7.4.21 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.22
ELECTRICAL:
A.
Electrical system installation.
Electrical wiring shall pass through a
channel or conduit. Approved rigid
or flexible electrical conduit shall withstand ramming pressures without damage
or collapse. Electrical wiring
within a channel shall be covered a minimum of one and one-fourth (1 1/4)
inches. Prior to ramming, a minimum
five (5) inch earth
cover shall be provided over any horizontal pipe.
B.
UF cable installation.
UF cable may not be rammed within the rammed earth wall. Exception: UF cable installed within an
approved conduit or channel. In a
channel installation, UF cable must be covered a minimum of one-and-one-fourth
(1 1/4) inches with plaster, adobe or similar finish.
C.
Electrical box installation.
Plastic electrical boxes shall not be rammed within the rammed earth wall. Exception: Plastic electrical boxes installed in a
channel installation.
[14.7.4.22 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.23
COMPRESSED
EARTH BLOCK CONSTRUCTION
(CEB):
A.
General. Compressed earth block shall not be used in
any building more than (2) stories in height. The height of every wall of compressed earth block without lateral
support shall be defined in Subsection B of 14.7.4.8 NMAC, table 1. The height of the wall is defined as the
distance from the top of the slab or top of stem wall to the underside of the
bond beam. Heights for exterior
walls, which are laterally supported with those supports located no more than
twenty-four (24) feet apart, are defined in Subsection B of 14.7.4.8 NMAC, table
1. The bottom story of a two-story
is allowed a minimum thickness of fourteen (14) inches with the upper story
allowed a thickness of ten (10) inches, providing the structure meets the
provisions of Subsection B of 14.7.4.8 NMAC, table 1.
B.
Fireplaces. Adobe or
masonry fireplaces and chimneys in compressed earth block structures shall
comply with 14.7.3.18 NMAC. They
shall be integrated into adjacent compressed earth block walls during
construction or secured to them by suitable steel ladder reinforcement or
reinforcing rods.
C.
Count Rumford fireplaces.
Count Rumford fireplaces are allowed as designated in 14.7.3.18 NMAC.
D.
Stop work. The building
inspector shall have the authority to issue a stop work order if the
provisions of this section are not complied with.
E.
Stabilized compressed earth blocks. The term stabilized is defined to mean
a block with certain
admixtures that retains minimum strength requirements as specified in Subsection
J of 14.7.4.23 NMAC after saturation in water. Saturation is defined as a minimum four
(4) hours of submersion in water as defined in ASTM
D1633-00.
F.
Unstabilized compressed earth blocks. Unstabilized blocks are defined as not
meeting the minimum strength requirements as defined in Subsection J of
14.7.4.23 NMAC after saturation in water.
Use of unstabilized compressed earth blocks is prohibited
within four (4) inches of the finished floor grade. Stabilized compressed earth blocks, poured concrete,
or waterproof masonry units and mortar may be used for the first four (4) inches
above floor grade.
G.
Materials. The material
must be a mineral soil with the aggregate content not exceeding one (1) inch in
diameter. The material shall not
contain more than two (2) percent soluble salts.
H.
Testing. Each of the
tests prescribed in this section shall be applied to sample units selected at
random of five (5) units per building project prior to construction. Test may be waived if block manufacturer
provides certification of compliance.
The certification must be dated within one year of the date on the
application for the building permit.
I.
Shrinkage cracks.
Shrinkage cracks are allowed, providing that these cracks do not
jeopardize the structural integrity of the blocks.
J.
Compressive strength.
Cured units shall have a minimum compressive strength of three hundred
(300) pounds per square inch when tested.
The compressed earth block shall be tested in
the flat position. The length of
the test unit must be a minimum of twice the width. The surfaces must be smooth. The test unit shall be subjected to a
uniform compressive load that is gradually increased at a rate of five hundred
(500) psi/minute until failure occurs.
A true platen should be used in the testing machine, along with swivel
head to accommodate nonparallel bearing surfaces. The compressive strength is defined as
P/A, where P = load and A - area of compression surface.
K.
Modulus of rupture.
Units shall have a minimum compressive strength of fifty (50) pounds per square inch in modulus
of rupture when tested according to the following procedures: A cured unit shall be laid over two-inch
(2) diameter cylindrical supports two (2) inches from each end and extending
across the full width of the unit.
A cylinder two (2) inches in diameter shall be laid midway between and
parallel to the supports. Load
shall be applied to the cylinder at a rate of five hundred (500) psi/minute
until rupture occurs. The modulus
of rupture is equal to:
3PL/2bt2 (P= rupture load in pounds, L= span
between supports, b= width of block, t= thickness of
block).
[14.7.4.23 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.24
MORTAR:
A.
General. The use of earth mortar is allowed if
the earth mortar
material is compatible with the compressed earth blocks. Conventional lime/sand/cement mortars of
Types M, S, and N are also allowed.
Mortar bedding joints shall be fully grouted. Head joint mortar is not required
provided that the blocks are initially laid
in contact. Partially open head
joints are allowed if the surface is to be plastered. All joints shall be lapped at least
twenty-five (25) percent of the visible block
length.
B.
Slip mortars. Liquid mud
slip mortar is allowed, providing it is made of a compatible soil that is
screened to eliminate aggregate larger than one-eighth (1/8) inch in
diameter. Water may be substituted
for slip or other mortars, providing adequate adhesion is
demonstrated.
C.
Stacking. Dry stacking
of compressed earth blocks is allowed
providing that adequate adhesion is demonstrated, the wall is to be stuccoed or
plastered and the wall is not less than ten (10) inches in
thickness.
D.
Use. Compressed earth block may be cured prior
to use or laid directly from the press into the wall in an uncured
state.
E.
Foundations. Compressed earth blocks may not be used for
foundations or basement walls.
F.
Footings. All compressed earth block walls shall have a
continuous footing at least ten (10) inches thick. The footing width must be a
minimum of thirty-three (33) percent greater than the wall width, but not less
than two (2) inches on each side.
The stem wall must be centered on the footing.
G.
Stem walls. All stem
walls that support CEB units shall extend to an elevation not less than eight
(8) inches above the exterior finish grade. Stem walls shall be as thick as the
exterior wall. Where perimeter
insulation is used, a variance is allowed for the stem wall width to be two (2)
inches smaller than the width of the CEB wall it supports.
H.
Concrete grade beam.
Rubble-filled foundation trench designs with a reinforced concrete
grade beam above are allowed to support CEB construction. An architect or engineer registered in
the state of New Mexico shall certify the grade beam/rubble-filled trench design
portion. Other alternative
foundation systems must be approved by the building
official.
[14.7.4.24 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.25
BOND BEAMS:
A.
General. All bearing walls
shall be topped with a continuous bond beam (except patio walls less than six
(6) feet high above stem). All bond
beam construction shall be in accordance with accepted engineering
practices.
B.
Concrete bond beam.
Concrete bond beams shall be a minimum of six (6) inches high by ten
(10) inches wide for walls up to fourteen (14) inches thick. Where CEB walls are wider than one
course, two-thirds (2/3) of each visible course top shall be covered by the
concrete bond beam. All concrete
bond beams shall be reinforced with a minimum of two (2) no. 4 reinforcing rods
at each floor and ceiling plate line.
C.
Wood bond beam. Wood
bond beams shall be a minimum of six (6) inches deep by ten (10) inches wide for
walls up to fourteen (14) inches thick.
Where CEB walls are wider than one course, two-thirds (2/3) of each
visible course top shall be covered by a wood bond beam and the roof load shall
be distributed over both bond beams.
Wood bond beams may be solid in the six inch (6) dimension, or may be
built up by applying layers of lumber.
Ends of wood bond beams are to be lapped in minimum of the width of the
wall and fully nailed. Galvanized
metal straps or perforated metal straps, 18 gauge minimum and twelve (12) inches
long, may be used to join the ends of wood bond beam members. Full nailing of straps is required. No wood layer shall be less than one (1)
inch nominal thickness. The
building official shall approve all wooden bond beams for walls wider than
fourteen (14) inches.
[14.7.4.25 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
14.7.4.26
LINTELS
A.
General. Lintels of wood
or concrete are allowed. The
bearing length of any lintel shall not be reduced by an angled or splayed window
or door opening. Other lintel
designs are accepted providing that engineering is submitted for review by the
building official.
B.
Wood lintels. When an
engineers drawing and seal is not provided for lintels, all wood lintels shall
conform to table 5 and have a fiber stress rating of at least 850
psi.
Table 5 CEB Wall Wood Lintel Schedule | ||||
minimum fiber stress 850
psi | ||||
Wall Width |
Max. Span |
Size |
Bearing length on earth wall |
Load Capacity |
10 |
4'-0 |
10 x 6 |
12 |
860 PLF |
6'-0 |
10 x 8 |
12 |
1020 PLF | |
8'-0 |
10 x 10 |
18 |
1150 PLF | |
10'-0 |
10 x 12 |
24 |
1000 PLF | |
12'-0 |
10 x 14 |
24 |
1000 PLF | |
12 |
4'-0 |
10 x 6 |
12 |
860 PLF |
6'-0 |
10 x 8 |
12 |
1020 PLF | |
8'-0 |
10 x 10 |
18 |
1150 PLF | |
10'-0 |
10 x 12 |
24 |
1000 PLF | |
12'-0 |
10 x 14 |
24 |
1000 PLF | |
14 |
4'-0 |
12 x 6 |
12 |
950 PLF |
6'-0 |
12 x 8 |
12 |
1150 PLF | |
8'-0 |
12 x 10 |
18 |
1300 PLF | |
10'-0 |
12 x 12 |
24 |
1300 PLF | |
12'-0 |
12 x 14 |
24 |
1200 PLF |
C.
Concrete lintels.
When an
engineers drawing and seal is not provided for lintels, all concrete lintels
shall conform to table 6 and have a minimum strength of 3000
psi.
Table 6 CEB WALL CONCRETE LINTEL SCHEDULE MIN. 3000 psi | ||||
Maximum Span |
Minimum depth * |
Reinforcing |
Maximum Capacity per linear foot |
Bearing
length on earth
wall |
Less than 6 -
0 |
8 |
2 - # 4 |
1500 lbs. |
12 |
6' - 0" to 10' -
0 |
12 |
3 - # 5 |
1500 lbs. |
18 |
11' - 0" to 16'-
0 |
16 |
3 - # 6 |
1500 lbs. |
24 |
* SIZE - Wall width X depth of
lintel |
[14.7.4.26 NMAC - Rp, 14.11.11.8 NMAC,
11-19-04]
HISTORY OF 14.7.4 NMAC:
Pre-NMAC History: None.
History of Repealed Material:
14.11.11 NMAC, Standard for Rammed Earth Construction (filed 10-31-01) repealed 11-19-04.
Other History:
14.11.11 NMAC, Standard for Rammed Earth Construction (filed 10-31-01) renumbered and replaced by 14.7.4 NMAC, 2003 New Mexico Earthen Building Materials Code, effective 11-19-04.