Select rigid foam insulation boards that are at least 1 2 inch less in thickness than the rafter space is deep if you plan to finish the attic as living space.
How to insulation attic foam boards.
A table saw will also cut the board but it.
Most people do not think about insulating their floors unless perhaps it s their attic floor.
Foam insulation boards can be attached to concrete walls as well and in such a case care should be taken not to chip the cement.
To attach the insulation you can use screws with large washers a special adhesive made for adhering foam board insulation or for smaller pieces you can seal them in with caulk or spray foam.
Remove the old insulation boards carefully without causing any damage to the walls.
How do you install rigid foam board.
Measure the space between rafters and cut the board to fit.
Foam board insulation is easy to cut with a circular saw with a masonry blade or scored with a utility knife and snapped like you would drywall.
Step 2 install insulation boards.
Foam board insulation is used on attics and walls yet it can also be used to insulate your floors.
But insulating your floors is a good idea for many reasons including energy efficiency and height adjustments.
You can use a utility knife to cut using the same cut and snap process you use with drywall.