You can use a utility knife to cut using the same cut and snap process you use with drywall.
How to insulation attic foam boards.
Most people do not think about insulating their floors unless perhaps it s their attic floor.
2 measure and cut the foam boards as.
Step 2 install insulation boards.
A table saw will also cut the board but it.
Remove any existing pieces of insulation that might have been covering the attic walls until now.
Measure the space between rafters and cut the board to fit.
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.
Foam board insulation is used on attics and walls yet it can also be used to insulate your floors.
Remove the old insulation boards carefully without causing any damage to the walls.
But insulating your floors is a good idea for many reasons including energy efficiency and height adjustments.
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.
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.