N.M. Admin. Code § 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 inches
nominal depth and extend the full width of the wall. Exception: The bond beam
width may be reduced as follows: Two inches maximum in an 18 to less than 24
inch thick rammed earth wall, or three inches maximum in a rammed earth wall 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 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 earthen building
figures supplement.
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 2500 psi concrete and shall contain steel
reinforcement as follows: For 18 to less than 24 inch thick rammed earth wall
construction, a minimum of two continuous number four reinforcing rods shall be
used. For walls equal to or greater than 24 inches in thickness, a minimum of
two continuous number five reinforcing rods shall be used. Provide two 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 number four
reinforcing rods. The reinforcement shall extend a minimum of 24 inches into
both portions of the concrete bond beam.
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