Rigid Foam Insulation Rafters

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.

Rigid foam insulation rafters.

However rigid foam insulation must be covered with a fire rated material when used on the interior of a building. You can also add rigid foam insulation under the rafters which adds r value and eliminates thermal bridging through wood rafters. 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. Molded expanded polystyrene foam board.

2 would be to create the baffle in the 1st place. Rigid insulation is one of the best tools to reduce your energy costs. Meps is a rigid board formed by molding polystyrene into boards. 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.

Rigid foam insulation also known as insulating boards provide high r values. Think of the same example of a wall and attaching drywall with the tons of screws. 2 snap a chalk line between the length measurements. 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. There are currently three types of rigid foam board. The 4 of rigid foam under the rafters at least give you r26. They keep your home at a comfortable temperature without the need to crank your heat.