N.M. Admin. Code § 14.7.2.23 - CHAPTER 15 - ROOF ASSEMBLIES AND ROOFTOP STRUCTURES

See this chapter except as provided below:

A. Section 1503 - Weather Protection. See this section of the IBC except as provided below.

(1) Section 1503.3 - Parapet walls. Delete this section and replace with the following: Parapet walls shall be coped or covered in accordance with Sections 1503.3.1. 1503.3.2, and 1503.3.3. The top surface of the parapet wall shall provide positive drainage.

(2) Add the following new section: 1503.3.3 - Plastered Parapets. Plastered parapets shall require a seamless but permeable waterproof cover or weather barrier, capping the entire parapet and wrapping over each side. The cover shall extend past any break from the vertical a minimum of four inches on the wall side. On the roof side, the cover shall properly lap any rising roof felts or membranes and be properly sealed. A layer of expanded metal lath shall be installed over the cover before plaster or stucco is applied. The lath shall extend past any break from the vertical on the wall side a minimum of five inches and on the roof side, the same distance as the cover below, allowing for plaster stops or seals. No penetrating fasteners are allowed on the horizontal surface of parapets.

B. Section 1506 - Materials. See this section of the IBC and add the following new sections.

(1) Section 1506.4 - Loose granular fill. Pumice and other granular fill type materials are not permitted in roofing assemblies.

(2) Section 1506.5 - Roof deck transitions. Where roof sheathing is overlapped to create "crickets" or valleys to canals, taperboard or equivalent shall be used to transition between the two deck levels to create a uniform substrate.

(3) Section 1506.6 - Canales or scuppers. All canales and scuppers must have a metal pan lining extending not less than six inches (152 mm) past the inside of the parapet and not less than six inches (152 mm) from each side of the canale or scupper opening. All canales and scuppers must have positive drainage.

C. Section 1512 - Reroofing. See this section of the IBC except as provided below. Section 1512.3 - Roof recovering. See this section of the IBC and add the following sentence to the end: New roof coverings shall not be installed without first removing existing roof coverings down to the structural roof deck. Where pumice or other granular fill are present, the material must be removed prior to installing new roof.

Notes

N.M. Admin. Code § 14.7.2.23

14.7.2.23 NMAC - Rp, 14.7.2.23 NMAC, 1-28-11, Adopted by New Mexico Register, Volume XXVII, Issue 21, November 15, 2016, eff. 11/15/2016, Adopted by New Mexico Register, Volume XXXIV, Issue 11, June 13, 2023, eff. 7/14/2023