Roof insulation is a material installed within or beneath the roof structure to reduce heat transfer between the interior of a building and the external environment. It improves energy efficiency by keeping homes warmer in winter and cooler in summer. Proper insulation also reduces strain on HVAC systems and lowers energy costs. In humid climates like Vancouver, insulation must be combined with proper ventilation to prevent trapped moisture and mold growth. Common insulation materials include fiberglass, spray foam, and rigid foam boards.
