We have a Bilco steel storm door leading to basement. The interior door is 36x80x1-3/8 standard interior hollow door.
I am considering using a foam insulation ("Great Stuff" 12oz can, $4.98) to make the door more energy efficient.
Is this a good idea? Do I risk over expanding foam which may damage the door?
My current plan is take door off hinge, drill the 1-3/8 side, top, middle and bottom and spray foam in.
How many cans of foam will it take - store clerk suggested 3 or 4?