Foam Insulation Roof Rafters

Spray foam insulation that s convenient and easy to use.

Foam insulation roof 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. The foam was applied to the attic rafters and walls. It typically has 3 variations. You can also add rigid foam insulation under the rafters which adds r value and eliminates thermal bridging through wood rafters.

Encapsulating the rafter or top truss chord roof framing members with spray foam will improve the energy efficiency of the attic space. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels. The best attic insulation. Rigid foam board is just above the roof deck or an exterior insulation option.

The previous four options are all used beneath the roof. Use closed cell foam it green for attic rafters. 100 free of cfcs vocs penta bdes urea formaldehyde. Step 1 prepare the roof.

A vent baffle should be installed between the insulation and the roof decking to maintain the ventilation channel. Class i e 84 fire retardant meets building code spec. I had spray foam insulation installed into a 55 year old house 5 years ago. I live in the northeast.

For the same reason insulation shouldn t touch the roof s underside. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. I still notice a smell permeating the upstairs of the house on hot days which is concerning over 5 years.

Get your kits the easy to use spray foam kit. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. When building my current home i was faced with a dilemma on how to insulate a bonus room that would be upstairs. 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. Build the rafters and secure the 5 8 inch cdx sheathing material. R value of 7 in 1 inch 97 closed cell foam. Place a ridge cap over the ridge to hide the gaps.