Rigid Foam Insulation Rafters

The 4 of rigid foam under the rafters at least give you r26.

Rigid foam insulation rafters. Measure the length and width between two rafters in your attic and transfer the measurements to a 4 ft by 8 ft of rigid foam insulation board. You can even place it under the foundation slab. But a 2x6 rafter with a 1 5 vent space would give you the ability to put 4 of rigid insulation r 26 in that space which was not filled. Polystyrene can be fashioned into various items including shipping materials such as packing peanuts and coffee cups as well as sheets of foam board insulation.

However rigid foam insulation must be covered with a fire rated material when used on the interior of a building. 2 would be to create the baffle in the 1st place. Rigid foam insulation also known as insulating boards provide high r values. The rafters are 2 6 so there is 5 5 of depth under the roof deck to put layers of rigid foam into as a stack of pancakes between the rafters.

They keep your home at a comfortable temperature without the need to crank your heat. 2 snap a chalk line between the length measurements. You can also add rigid foam insulation under the rafters which adds r value and eliminates thermal bridging through wood rafters. Install it anywhere from the roof to the foundation.

Meps is a rigid board formed by molding polystyrene into boards. I would also like to attach 4 x8 sheets of rigid foam at least 1 2 inch thick to the lower edge of the rafters to prevent thermal bridging. Think of the same example of a wall and attaching drywall with the tons of screws. There are currently three types of rigid foam board.