Foam Attic Air Vents For Eves

If the atmospheric combustion appliances start off in a vented attic the building code doesn t require those vents because the appliances are already connected to the outside and should get plenty of air.

Foam attic air vents for eves.

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. Intake air is critical to maintaining a proper flow of air throughout the attic space. Unvented attic assemblies unvented attics rely on an air impermeable insulation installed to the roof deck s underside i e. For improved air circulation in the attic install the durovent 22 in.

Spray polyurethane foam will provide thermal insulation that will minimize air infiltration which can help to save on heating and cooling costs within the indoor environment. Eaves are the undersides of your roof that extend beyond the walls of a building an area commonly directly over decorative plants and vegetation. With spray foam unlike with loose fill or batts you must cover the soffit vents they aren t needed to keep the roof cool. Rafter vent 10 pack xudv2248 the home depot.

Foam blocks airflow needs no vapor barrier and has a higher r value per inch than loose fill or batts so you ll get more protection with less depth. Then cover the foam with drywall as required for fire safety. The egv6 power gable mount vent can move air at a rate of up to 1600 cu. Air enters low and then escapes out of the attic higher up near the peak of the roof usually via a ridge vent an attic fan which we do not recommend static roof vents or a high mounted gable vent fan.

They can quickly remove a larger volume of hot and or humid air from your attic compared to static ventilation which helps save money on your heating and cooling costs. For decades the typical solution to this problem was to install ventilation baffles near the eaves connecting the air space above the soffit vents with the attic and then to install as much fluffy insulation usually fiberglass or cellulose as there was room for between the top plate of the exterior wall and the ventilation baffle. It can be cut to fit most joist spaces and is an affordable way to meet energy code requirements durovent 22 in. Insulation is used in an attic for cross ventilation to minimize potential for moisture accumulation and condensation to help energy savings and moisture control.

That s why our fire resistant eave vents are especially recommended and in many cases required by california builder code in chapter 7a for the wildland urban interface. When set into place and sealed with spray foam the vent baffles are insulated and air sealed.