Your board must leave at least inch gap between the board and the roof.
How to install insulating foam board in an attic.
If it you need to spread it use a brush to help cover and smooth out the glue.
Remove any existing pieces of insulation that might have been covering the attic walls until now.
How to install foam board on a walk in attic door.
You can use a foamboard adhesive to glue it in place.
Remove the old insulation boards carefully without causing any damage to the walls.
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.
Next you will need to place the foam board insulation between each joist as a test.
If it fits proper with no space between on either side of the board pick it up and put a thin layer of glue on.
Put the board between the rafters.
No matter how much insulation you add to your home s walls floors and ceilings you re throwing your money away if you don t insulate your attic.