How to Insulate a Hollow Interior Door

A hollow door, also known as a hollow-core door, is lighter than a solid door and less expensive as well. However, it lacks the insulating qualities of a solid door, and you may find that you can feel drafts very strongly if the door leads from a cold area inside your home to a warmer area. While you cannot inject spray foam into the door itself, you can use rigid foam insulation to cover the door and warm your home.

Measuring tape
Rigid foam insulation
Craft knife
Clear epoxy adhesive

Instructions

- 1
  Measure the height and the width of the hollow-core door.
- 2
  Cut a segment of rigid foam insulation that matches the measurements of the hollow-core door, using a craft knife. If you have a large door, you may need more than one piece of foam butted up next to each other.
- 3
  Apply a thin coat of epoxy adhesive to the side of the door where the insulation will be affixed. Choose the side of the door that you see the least.
- 4
  Press the insulation to the door, holding it in place for several seconds until the epoxy holds.
- 5
  Allow the epoxy to cure for 24 hours.

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