WebOct 18, 2024 · With 4-5" of insulation between the joists (even at R10/inch), the 4-5" path through the rafter is only R5-ish, which is an ice-dam starter. Deepening the total … WebApr 3, 2015 · 1) strip the shingles off to the roof sheathing. 2) Apply rubber membrane over sheathing- This is to act as an air barrier. 3) Add r31 of foam to roof to create the correct inside to outside ratio of insulation as …
How to Attach Rigid Insulation on the Underside of the Roof …
WebApr 12, 2024 · Upgrading your roof insulation is an essential step towards improving energy efficiency in your Sunshine Coast home. With proper insulation, you can reduce heat transfer, resulting in lower energy bills and a reduced carbon footprint. Insulation helps retain warmth during colder months, and keeps your home cool during the hot, sunny … WebClosed-cell foam has a higher R-value per inch and is vapor impermeable. It also will perform better below or above grade. Cold-climate builders using open-cell foam in an unvented roof assembly can reduce the chance of damp roof sheathing by installing drywall painted with vapor-retarder paint. Hot-climate builders need to heat the attic ... chirurgie hanche prothèse
Ventilation or no ventilation in spray foam insulated building?
WebAn alternative option is to insulate the rafter bays with a less expensive insulation like fiberglass or cellulose and to control the temperature of the roof sheathing with rigid foam onthe exterior. This approach works well in nearly any assembly, but especially on … WebA few materials are required to properly insulate the roof rafters in the attic. ⦁ Foamboard ⦁ Fiberglass batting ⦁ Spray foam ⦁ Baffle rafter vents ⦁ Hammer ⦁ Cutter ⦁ Roofing Nails … WebOPTION 2: Rigid foam on roof sheathing with air-permeable insulation between the rafters. Rigid foam also can be installed above the roof sheathing in tandem with air-permeable insulation between the rafters. In this case, the rigid foam can be thinner than when it’s used alone. Code specifies the minimum R-value of the rigid-foam layer. graph in math