Henderson follows the 2018 IECC and Nevada amendments requiring high-reflectance cool roofs on new low-slope commercial buildings. Aimed at reducing the urban heat island in the Mojave Desert where summer roof temperatures exceed 160 degrees.
Under HMC Title 8 building rules and Nevada-amended International Energy Conservation Code, new low-slope commercial roofs in Henderson must meet minimum solar reflectance index thresholds — typically 0.65 initial reflectance for roofs sloped under 2:12. Steep-slope and residential roofs are not mandated but eligible for utility rebates. Las Vegas Valley summer ambient temperatures regularly exceed 110 degrees, with dark roof surfaces hitting 160-plus, intensifying cooling loads. Cool-roof compliance is verified at Certificate of Occupancy.
Roofs failing reflectance verification at CO inspection must be re-coated or replaced before occupancy approval. Re-inspection fees apply.
See how other cities in Clark County handle cool roof requirements.
See how Henderson's cool roof requirements rules stack up against other locations.
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