Foam Insulation Roof Rafters

The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow.

Foam insulation roof rafters.

The foam was applied to the attic rafters and walls. The previous four options are all used beneath the roof. For the same reason insulation shouldn t touch the roof s underside. Often the r value of fiberglass insulation is too low and requires the rafters to be retrofitted making foam board a better choice.

100 free of cfcs vocs penta bdes urea formaldehyde. Class i e 84 fire retardant meets building code spec. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels. Consider using high density r 30 batts which are as thick as r 25 batts but fit into 2x10 framing.

If you are adding foam insulation to your roof rafters you must also properly ventilate the area. R value of 7 in 1 inch 97 closed cell foam. It typically has 3 variations. 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.

I still notice a smell permeating the upstairs of the house on hot days which is concerning over 5 years. Leave a gap on both sides of the roof near the ridge so air can escape. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. Place a ridge cap over the ridge to hide the gaps.

You can also add rigid foam insulation under the rafters which adds r value and eliminates thermal bridging through wood rafters. Polyurethane or polystyrene spray foams can provide thorough coverage to roof rafters and attic walls in much less time than is needed for other materials. When building my current home i was faced with a dilemma on how to insulate a bonus room that would be upstairs. Encapsulating the rafter or top truss chord roof framing members with spray foam will improve the energy efficiency of the attic space.

Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. I live in the northeast. Rigid foam board is just above the roof deck or an exterior insulation option. The best attic insulation.

Build the rafters and secure the 5 8 inch cdx sheathing material. Step 1 prepare the roof. Get your kits the easy to use spray foam kit. Use closed cell foam it green for attic rafters.