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Thermal Building Envelope


The following items must be shown and/or noted on the building plan:

·         The method used in achieving compliance.

1.   "R-value computation"

2.   "U-factor alternative"

***Please note:  If the "U-factor alternative" method is used, each assembly must be detailed with the summed U-factors noted.

3.   "Total UA alternative."

   ***Please note: If the "Total UA alternative" method is used, an energy calculation showing compliance is required, reference section N1102.1.3, I.R.C.

·         The added insulation R-value shall be properly delineated on the wall/roof/floor section details.

·         The fenetration U-factor and solar heat gain coefficient (SHGC) noted.

·         The skylight(s) U-factor and solar heat gain coefficient (SHGC) noted.

·         The exterior door(s) U-factor noted.

·         Added insulation in combination with "mass walls" shall be noted by R-value and shall include the installed location.


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