Rigid Foam Insulation 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.

Rigid foam insulation rafters.

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. 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. Rigid foam insulation also known as insulating boards provide high r values. Install it anywhere from the roof to the foundation.

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. They keep your home at a comfortable temperature without the need to crank your heat. 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.

You can even place it under the foundation slab. Rigid insulation is one of the best tools to reduce your energy costs. The 4 of rigid foam under the rafters at least give you r26. Consider using high density r 30 batts which are as thick as r 25 batts but fit into 2x10 framing.

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