How To Insulate A Roof And Soffit

The principle behind soffits is to allow air to circulate in and around the attic. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. The soffit vents are now installed but you still need to make sure there s no insulation blocking the new vents.

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If the attic is insulated with fiberglass batts just pull back any that are blocking the flow of air.

How to insulate a roof and soffit.

For the same reason insulation shouldn t touch the roof s underside. You need one baffle for each. An advantage of spray foam is it s quick whereas foam board needs to be cut and measured which can be a chore. Alternatively use two half sheets of 3 4 inch.

To insulate the roof itself you either use spray foam or retrofit with it with rigid foam board. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. If there s blown in insulation like ours rake back the fluffy stuff with a 3 or 4 ft long 1 x 6 or use a garden rake or hoe. In most residential homes the soffit and associated vents is the structural part of the roof that hangs over the side of the home.

Insulating and venting when there is no roof soffit. How to keep blow in insulation out of soffits. Set the baffles inside the attic opening along with a loaded staple gun. Construct a soffit or eaves overhang combined with assuring that an opening is provided all along the top of the building wall by removing any blocking between roof rafters at the top plate combined with use of roof insulation baffles to assure an air inflow pathway under the roof deck.

Lay strips of 3 4 inch plywood that are at least 24 inches wide across the floor of the attic.

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