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.

Foam insulation roof rafters. Spray foam insulation that s convenient and easy to use. When building my current home i was faced with a dilemma on how to insulate a bonus room that would be upstairs. Step 1 prepare the roof. You can also add rigid foam insulation under the rafters which adds r value and eliminates thermal bridging through wood rafters.

100 free of cfcs vocs penta bdes urea formaldehyde. Place a ridge cap over the ridge to hide the gaps. Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away.

The foam was applied to the attic rafters and walls. A vent baffle should be installed between the insulation and the roof decking to maintain the ventilation channel. If you are adding foam insulation to your roof rafters you must also properly ventilate the area. The best attic insulation.

Often the r value of fiberglass insulation is too low and requires the rafters to be retrofitted making foam board a better choice. 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. R value of 7 in 1 inch 97 closed cell foam. I still notice a smell permeating the upstairs of the house on hot days which is concerning over 5 years.

For the same reason insulation shouldn t touch the roof s underside. Get your kits the easy to use spray foam kit. It typically has 3 variations. Leave a gap on both sides of the roof near the ridge so air can escape.

I had spray foam insulation installed into a 55 year old house 5 years ago. Consider using high density r 30 batts which are as thick as r 25 batts but fit into 2x10 framing. Class i e 84 fire retardant meets building code spec. I live in the northeast.

Build the rafters and secure the 5 8 inch cdx sheathing material. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. Rigid foam board is just above the roof deck or an exterior insulation option. Encapsulating the rafter or top truss chord roof framing members with spray foam will improve the energy efficiency of the attic space.