How to fill a gap between door and sub floor?

My son in law and I recently put a new sliding patio door. The door was a little different size. This left a gap between the door and sub floor that is 2 inches deep and 2 inches wide and runs the 72 inch door width. What would be the best product to fill this gap. I am planning on using floor leveler. Going to rip up the carpet and put down laminate. Thanks in advance.

  3 answers
  • William William on Jan 13, 2019

    A phot would help. The bottom track for the door should have been attached to the subfloor and a filler strip of wood on top to take up the space. At this point use a wood filler strip on the bottom. Make sure that it is sealed and waterproofed.

  • Robin Robin on Jan 13, 2019

    Can you slide in a 2x2 piece of wood, the length of the door & screw it down? Then fill with expandable foam. Filling the gap would have been easier to fix prior to putting the door in place.

  • Seth Seth on Jan 13, 2019


    Use pressure treated wood for the filler strip. You may also want to use a piece of aluminum flashing or waterproof membrane to insure water does not run back up under the door frame.