Cathedral Ceiling & Roof Deck Insulation: Eliminate Ice Dams & Attic Heat

Cathedral and vaulted ceilings are among the most difficult assemblies to insulate effectively because there is no attic floor or ventilation buffer between the living room ceiling and the hot or freezing roof deck. Spraying closed-cell polyurethane foam directly to the underside of roof sheathing creates an unvented, conditioned roof assembly. This eliminates extreme thermal transfer, stops winter ice dam formation, and creates a clean, temperature-controlled envelope right beneath your rafters.

Key Application Benefits

• Prevents Winter Ice Dams: Stops warm interior conditioned air from escaping to the roof deck, keeping exterior snowmelt uniform and preventing destructive roof-edge ice dams.
• Controls Summer Radiant Heat: Rejects intense radiant solar gain from exterior shingles or metal roofing, keeping upper floors and vaulted rooms comfortable year-round.
• Eliminates Problematic Roof Venting: Converts traditional vented rafter assemblies into an airtight unvented roof plane, avoiding bulky baffles and wind-driven rain infiltration.
• Structural Deck Reinforcement: High-density closed-cell foam bonds tightly to roof rafters and sheathing, significantly increasing uplift wind resistance and structural rigidity.