Roof Ventilation With Rafter Insulation

Rafter vents come in 4 foot lengths and 14 1 2 and 22 1 2 inch widths for different rafter spacings.

Roof ventilation with rafter insulation.

If you install fiberglass batts between your rafters the fiberglass batts protect the rigid foam baffles from igniting. To install the rafter vents staple them directly to the roof decking. Rafter vents come in 4 foot lengths and 14 1 2 and 22 1 2 inch widths for different rafter spacings. Roof insulation configurations for unvented rafter truss assemblies.

Raft r mate attic rafter vents create a space between each rafter for air to flow freely up the rafters and into the attic. Rafter vent with built in baffle helps keep air moving in your attic. The ventilation system features polystyrene construction which is lightweight and moisture resistant and the integrated baffle means that you need no blocking material between the vent and the top plate. Durovent durovent 22 in x48 in raft vent 10 pack.

Rafter vents ensure the soffit vents are clear and there is a channel for outside air to move into the attic at the soffits and out through the gable or ridge vent. If insulation is allowed to bunch against the inside slope of the roof between the rafters air will be blocked before it can traverse the attic. The ado products durovent 23 1 2 in. Owens corning raft r mate attic rafter vents.

Each carton contains 10 vents. Rafter vents ensure the soffit vents are clear and there is a channel for outside air to move into the attic at the soffits and out through the gable or ridge vent. Images courtesy simpson gumpertz heger. That said it s always a good idea to have an air barrier on the interior side of the fiberglass batts and it is illegal to leave kraft facing exposed.

Ibc dictates acceptable placement and composition of roofing materials in chapter 15 but describes required thermal efficiency of the roof in chapter 13 which references the international energy conservation code iecc the minimum required thermal resistance varies. Rafter vents or insulation baffles install in any rafter space to create narrow gaps that direct fresh air from the soffit vents to the peak of the roof. The fresh air flows up between rafters to the ridge where a ridge vent roof vents or gable vents allow the air to exit. But attic ventilation baffles are always covered by insulation.

Cut the polyiso insulation to fit snugly in each rafter bay and foam it in place against the spacer to create a 2 in.