N.M. Admin. Code § 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 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 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 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. Compressed earth block shall be laid in level courses so that
the top of any course shall be at the same height above the stem around the
structure.
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 10 inches thick. The footing width must be a minimum of
thirty-three percent greater than the wall width, but not less than two 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 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 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.
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