Foam Board Insulation In Attic 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.

Foam board insulation in attic rafters.

Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. It is lightweight and easy to work with. By adding the insulation under the rafters to maintain a ventilated roof at a cost of say1600 for a r28 airsealed radiant barrier product with the ability to add more if needed at a later date how is that a bad idea if an air sealed attic floor w blown in will cost roughly the same and i still won t have a good environment for hvac etc. For new construction use rigid boards to insulate slabs and the outside of foundation walls.

Both can be added to uninsulated attics or layered over existing material. For diy attic insulation you ve got two choices. Install them using panel adhesive or screws. Here s how to use 3 layers of 2 inch polyiso foam board to meet code and keep your ne.

2 snap a chalk line between the length measurements. The superattic system utilizes proprietary silverglo rigid foam insulation panels to fully seal and insulate the attic directly beneath the roof rafters and directly inside the gable ends. They re much lighter and easier to work with than plywood sheets. Typical thicknesses range from inch to 2 inches with estimated r values of r 3 for the inch to r 10 for the 2 inch board.

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. Smaller sizes are also available. Rigid foam board also known as foam board or insulation board can be an excellent option for insulation. Some types of thicker foam board insulation are available but they may need to be special ordered.

It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches. Better than spray foam thermal break and relatively consistent r 30. A 4 by 8 board weighs next to nothing and can easily be cut to fit. Working with home insulation boards insulation panels typically come in 4x8 foot sheets.

Loose fill or batt the common term for blanket insulation.