Can you trim a hollow core door?
Yes! But the question then becomes, what do you do to re-close the bottom? We’ve got a solution that is easier than reusing the wood block from the piece you cut off.
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Hollow door fix
The next time you have to shorten a hollow-core door, try replacing the bottom rail with expanding foam instead of wood.
- Cut the door to the right length.
- Clamp stiff boards to both sides of the bottom (as shown).
- Fill the hollow door bottom with expanding foam insulation.
- After the foam dries, trim off the excess with a utility knife and rehang the door.
Next, check out: Fix Sagging or Sticking Doors
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