WUI (Wildland Urban Interface) zones are designated areas where residential development meets undeveloped wildland vegetation — creating documented wildfire exposure risk. Significant portions of Draper, Sandy, Cottonwood Heights, Herriman, and foothill communities throughout the Wasatch Front carry WUI designations. In these zones, fire-resistant cladding is often required by local ordinance or HOA policy. Vinyl siding is not WUI-appropriate — it melts and contributes fuel load. Untreated wood requires fire-retardant treatment to achieve WUI compliance. Fiber cement, stucco, and stone veneer are Class 1/A non-combustible and WUI-compliant. RainFire Builders verifies WUI classification before recommending any siding material.