Insulation
A signed insulation (as installed) certificate is required to be posdted on or in the electrical service panel. ***Please note: Insulation requirements based on "Climate Zone 2."
The residential checklist for insulation includes:
- Added insulation per drawings (ceiling R-value: min. R-30, frame wall R-value: min. R-13), Table N1102.1, I.R.C. (note: flame-spread index not to exceed 25 and smoke-developed index not to exceed 450, see exceptions – section R316.1)
- Mass walls (CMU and ICF) w/added integral and/or exterior insulation: min. R-4, sect. N1102.2.3, I.R.C.
- Mass walls (CMU, concrete and full width solid brick) with added interior insulation: min. R-6, section N1102.2.3, I.R.C.
- Blown roof / ceiling insulation (listed product) requires depth marker for every 300 sq. ft. of attic space, with marker (identifying R-value / 1 inch) facing attic access opening, section N1101.4.1, I.R.C.
- Baffles to be installed at soffit (attic ventilation) opening to ensure min. 1 inch. unobstructed air space below roof sheathing material
- Sprayed polyurethane foam insulation (listed product) requires surface preparation per listing/manufacturer’s specifications and written certification by installer including total foam thickness and R-value installed, section N1101.4.1
- Glazing to be labeled (paper label): min. SHGC of 0.40 and min. U-value of 0.75., Table N1102.1, I.R.C.
- Exterior door (paper label): minimum U-factor of 0.60 for insulated metal and minimum U-factor of 0.50 for wood
- Recessed lighting fixtures must be IC-rated in compliance with City amended section N1102.4.3, I.R.C.
- Supply and return ducts: min. R-8 (in floor trusses: min. R-6), section N1103.2
- A/C refrigerant lines: min. R-2, section N1103.3, 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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