Exterior Lath
The residential checklist for exterior lath includes:
- Weep screed (min. 26 galv. sheet gage corrosion-resistant), with a min. 3 ½ inch vertical attachment flange, located a min. 4 inches above the earth and a min. 2 inches above any paved surface, section R703.6.2.1, I.R.C.
- Water-resistive barrier of two (2) layers of Grade D paper or equivalent, section R703.6.3, I.R.C.
- One and one-half (1 ½) lb. density foam material / installation per current ICC ES report, including: horizontal T & G joints (taped and tight) and vertical backing at vertical butt joints (taped and tight) ***Please note: Foam plastic is not to be exposed to building’s interior, including attic spaces. A thermal barrier (min. 1/2 inch gypsum wallboard or equivalent) separation is required, section R314.4, I.R.C.
- Woven wire lath lapped at joints per current ICC ES report
- Wire lath connection to foam panel, stapled max. 6 inches o.c.
- All wire lath corner aids and all pop-outs to be nailed or stapled max. 6 inches o.c.
- Horizontal lath greater than 16 inches in depth must be diamond mesh or equivalent (incl. horizontal surfaces at archways, patio beams, entry openings, etc.)
- Foam panel vertical butt joints and gaps at window perimeter: maximum¼ inch or caulked
- All penetrations to be caulked
- Electrical boxes and extension rings to extend out to exterior face of foam panel or minimum one hour fire-resistive rated caulking at exposed cut edge of foam panel opening, City standard
- Only perimeter of electrical service backing panel against foam panel to be caulked. ***Please note: Required minimum ¼-inch ventilation air gap between electrical service panel and electrical service backing panel, section E3807.2, I.R.C.
Contact Information
City of Litchfield Park
Building Safety Department
214 West Wigwam Boulevard
Litchfield Park, Arizona 85340
Ph: 623-935-1066
Fx: 623-535-9754
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