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My SO is a renter and their landlord sent someone over to replace the back door. The removal of the old door and installation of the new one wasn't great - the new door doesn't fit properly, and there is now a gap of space next to the doorframe. It lets in air and light, but more annoyingly, moths and other insects can get inside. I stuffed the gap (between a quarter of an inch and an inch at various spots) with newspaper from the inside. Is this a terrible temporary fix? The landlord is often not quick with repairs, so I don't expect that it will be remedied anytime soon (it has already been several months). We don't want to spend a lot of money correcting their error, but don't want to do anything that could be dangerous or lead to mold or other, bigger issues. Thank you for any advice or insight.

  • Can you add some images of the gap? It would help get you more accurate answers – Machavity May 21 '17 at 0:06
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It is not an error to have a gap, It is an error that the job was not finished properly.

The gap or space in not unusual. the opening ( rough opening ) is always larger then the door jam so that the door can positioned inside the opening plumb and true ( square ).

The gap is supposed to be filled with insulation of some kind. Typically this is a spray foam product in a can. You can do this your self, You must use a spray foam called minimally expanding window and door spray foam insulation.

You should mask off the wall and the jam with painters tape so if you spray to much in and it expands outside of the gap and onto the wall/jam it will not stick to the jam or wall. ( it is tenacious stuff and not easy to remove and will leave a stain ) once dried you can trim any excess off with a knife. ( an old serrated bread knife works well for this, and then remove the painter tape. You do not fill the whole void as the foam will expand two to three times its volume. I am sure if you do YouTube search for how to spray foam a door jam you will get plenty of instructions.

The door trim is then installed and this will hide the gap/insulation.

  • @JimmyFix-it Installing a new door in an existing rough opening can lead to gaps larger then optimal especially if the R/O is not square. Of coarse it should have been done properly, addressing the R/O before installing the door but the OP asked for a temp fix. – Alaska Man May 21 '17 at 0:29
  • good suggestions for temporary fix. – Jimmy Fix-it May 21 '17 at 13:51

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