Is It Worth Spray Foam Insulating Your Roof Rafters

If you re not do the attic floor.

Is it worth spray foam insulating your roof rafters.

Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. Yeah you probably still breathed some of it but not as much as you will now with spray foam on the roof deck. Similar to loose fill though this is a liquid that when applied becomes a durable layer of foam insulation. Half inch drywall is usually sufficient but check with local building officials before installing.

It s important you spray foam attic rafters only if you need to. Consumers are often told by spray foam contractors to do the rafters. You may have odor problems. If you decided to use a rigid foam board to help insulate your cathedral ceiling you would install the board on top of the roof sheathing and underneath the plywood at the top of the roof.

Two material options called open and closed cell where closed cell is more dense greater r value and much more expensive. Encapsulating the rafter or top truss chord roof framing members with spray foam will improve the energy efficiency of the attic space. Your indoor air quality may get worse. With spray foam unlike with loose fill or batts you must cover the soffit vents they aren t needed to keep the roof cool.

If you re using the attic for living space then you need to insulate the rafters. By encapsulating the attic and leaving the old insulation up there that filth is in your conditioned space. This is because the effects of thermal bridging are limited which also results in the elimination of melt lines on the roof surface in cold climates. Rigid foam board installation in the case of a cathedral ceiling involves installing three different layers that are each 1 5 inches thick according to the.

Then cover the foam with drywall as required for fire safety. Moisture from the house picture this. 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. You can also add rigid foam insulation under the rafters which adds r value and eliminates thermal bridging through wood rafters.

You take a shower but forget to turn the bath fan on. However rigid foam insulation must be covered with a fire rated material when used on the interior of a building.