N.M. Admin. Code § 14.7.4.28

Current through Register Vol. 35, No. 21, November 5, 2024

Section 14.7.4.28 - PLASTERING

A.Plasters and stuccos applied to uninsulated, unstabilized walls. Unstabilized, uninsulated exterior CEB walls can be protected with plasters or stuccos with a minimum thickness of seven-eighths inch, if adequate roof, parapet, canal, and window flashing is provided.

(1) Portland-based plaster must be reinforced with self-furring metal wire mesh, minimum 17 gauge by one and one-half inch openings, securely attached to the exterior CEB wall surface by nails or staples with a minimum penetration of one and one-half inches. Such mesh fasteners shall have a maximum spacing 16 inches from each other. Wood surfaces or areas of dissimilar materials to be covered with Portland-based plaster must be protected from moisture with asphalt felt, covered with expanded metal lath, securely attached to the CEB wall.

(2) Type S hydrated lime stuccos are allowed providing that CEB head joints are left partially open as provided by Subsection A of 14.7.4.24 NMAC. Lime-based stuccos do not require a wire mesh cover except when used over wood or dissimilar materials in which case the surface must be protected from moisture with asphalt felt, covered with expanded metal lath.

B.Plasters and stuccos applied over foam or board insulations. Portland-based plasters or lime-based stuccos used over insulation board or foam shall follow Subsection A of 14.7.4.27 NMAC.

C.Other Protective coatings or plasters. Coatings other than Portland-based plaster or lime-based stucco are allowed providing they do not constitute a vapor barrier. Interior gypsum or mud plasters may be applied directly to the wall, provided that CEB 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 or coating systems shall be submitted for approval by the building official.

N.M. Admin. Code § 14.7.4.28

14.7.4.28 NMAC - N, 1-28-11, Adopted by New Mexico Register, Volume XXVII, Issue 21, November 15, 2016, eff. 11/15/2016