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Exterior Lath
The residential inspection 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 R316.4, I.R.C.
  • Woven wire lath lapped at joints per current ICC ES report.
  • Woven wire lath connection to foam panel, stapled max. 6 inches o.c., section R703.6.1, I.R.C.
  • Woven wire lath shall extend to and cover the attachment flange of the weep screed, section R703.6.2.1, I.R.C.
  • All wire lath corner aids and all pop-outs to be nailed or stapled max. 6 inches o.c., section R703.6.1, I.R.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: maximum ¼ inch or caulked per ICC ES report.
  • All penetrations to be caulked, section R703.2, I.R.C.
  • 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 policy.
  • 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 E3907.2, I.R.C.
  • Damaged woven wire lath, weep screed, and/or damaged foam panel (including UV damaged) requires replacement.
  • Metal roof flashing and counter-flashing shall be installed to divert the water away from the roof intersections, wall/roof intersections, etc. Flashing to be minimum No. 26 galvanized sheet metal, section R903.2.1, 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

Updated 4/22/16