Roof Ventilation With Rafter Insulation

Roof insulation configurations for unvented rafter truss assemblies.

Roof ventilation with rafter insulation.

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. To install the rafter vents staple them directly to the roof decking. 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.

Rafter vent with built in baffle helps keep air moving in your attic. Rafter vents come in 4 foot lengths and 14 1 2 and 22 1 2 inch widths for different rafter spacings. If you install fiberglass batts between your rafters the fiberglass batts protect the rigid foam baffles from igniting. 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.

Images courtesy simpson gumpertz heger. 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. 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. To install the rafter vents staple them directly to the roof decking.

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. Raft r mate attic rafter vents create a space between each rafter for air to flow freely up the rafters and into the attic. Item 1571672 model xudv2248. Rafter vents come in 4 foot lengths and 14 1 2 and 22 1 2 inch widths for different rafter spacings.

Each carton contains 10 vents. 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. But attic ventilation baffles are always covered by insulation. The ado products durovent 23 1 2 in.

The fresh air flows up between rafters to the ridge where a ridge vent roof vents or gable vents allow the air to exit.