Foam Board Insulation Attic Rafters

2 snap a chalk line between the length measurements.

Foam board insulation attic rafters.

When building my current home i was faced with a dilemma on how to insulate a bonus room that would be upstairs. Often the r value of fiberglass insulation is too low and requires the rafters to be retrofitted making foam board a better choice. Some types of thicker foam board insulation are available but they may need to be special ordered. It s worth changing tactics to insulate between the rafters and wall joists instead of the floor.

Better than spray foam thermal break and relatively consistent r 30. 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. Attic hatch or door. 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.

Add weatherstripping around the perimeter and a sweep to the door of a walk up attic. You can use rigid foam panels or do as. Affix rigid foam insulation to the attic side of the hatch or door. Pull down stair or ladder.

The superattic system creates a continuous air and insulation barrier directly beneath the attic roof with no thermal bridging to compromise energy. 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. A brief snippet of how and why i used rigid foam insulation for some areas of the tiny house. Here s how to use 3 layers of 2 inch polyiso foam board to meet code and keep your ne.

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. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. Foam board insulation is easy to use and is a great diy way to add some insulation. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.