Utah’s Wasatch Front (Salt Lake City, Sandy, Draper, Provo) sits in IECC Climate Zone 5, requiring: exterior walls R-20 continuous or R-13 cavity plus R-5 continuous insulation; ceilings and attics R-49; floors over unconditioned spaces R-30; slab perimeter R-10 to 2 ft depth. Utah mountain communities — Park City, Heber City, and elevations above roughly 7,000 ft — fall in Climate Zone 6, requiring R-20+5 or R-13+10 walls, R-49 ceilings, and R-30 floors. RainFire Builders verifies climate zone and current adopted code for every project location before specifying insulation products.