Roof Foam Baffles Ventilation

Attach this roof and attic insulation treatment using foam baffles to ventilate insulate and channel cold and hot air to roof vents before insulation is add.

Roof foam baffles ventilation.

These insulation baffles are strong enough to support spray foam expanding insulation creating the required air chute most shingle manufacturers require for shingle warranties. Bsc has a wonderful picturesque illustration also supported by fsec eeba and southface of exactly how the. They can also be assembled from thin plywood or fiberboard sheathing. Chris with your proposed stack up both types of insulation are in the cavities leaving each rafter as a thermal bridge.

After installed the smartbaffle is 14 wide with 2 flanges. They can create deeper ventilation channels for example and can be sturdier. Site built ventilation baffles can be made out of rigid foam. However spurred by recent claims of energy savings and moisture control unvented attics have become popular in both residential and commercial applications.

For decades designers of attics and crawlspaces have used cross ventilation to minimize potential for moisture accumulation and condensation. While these attics can be used in many circumstances this author believes there are reasons. Each piece can be very easily cut in half using a standard utility knife. Baffles and insulation keep air moving below a roof deck to expel the air outside.

Jul 4 2015 attach this roof and attic insulation treatment using foam baffles to ventilate insulate and channel cold and hot air to roof vents before insulation is add. Site built baffles have several possible advantages over manufactured baffles. In zones 1 and 2 installing a vapor barrier on the bottom side of foam in the roof line goes against the basic prerequisites of building science especially in the south zones 1 and 2. When set into place and sealed with spray foam the vent baffles are insulated and air sealed.

The rigid foam is cut to be 2 inches wider than the space between rafters then 1 inch of foam is scored and folded over on either side of the foam creating standoffs that hold the foam away from the roof sheathing providing a space for air to flow.