Leaking Back Door to Deck

Answered by Brett ~ June 29, 2010 ~ No Comments

Our back door on our main floor that leads to the outside deck is leaking from the top and then coming down the inside of the door and leaking up under our inside wood floor. Need help to fix. We had one contractor already try to fix it and it did not work. Is there anything I can do on my own to fix this problem?

Tom M. ~ Clarksville, Tennessee

Brett Kulina

Tom, I am guessing that the back door of your home was not properly installed, and therefore water is dripping down the siding of your house and entering your home through the wall at the top of the door. If a door has been properly installed, then there should be a piece of metal flashing running along the top of the door which diverts water away from the house. This flashing piece is "L" shaped and is nailed directly to the plywood sheathing on the side of the house. The flashing is then covered by house wrap, which is installed under the siding, and creates a watertight wall covering that sheds rain water just like roof shingles do. There are also several types of flashing tape available which can really help weatherize the openings around a home's windows and doors.

Fixing this leak should not be that difficult, and you may only need to remove the exterior trim above the door to get to the problem area. Once the trim is removed, you will be able to get a better idea of how the door was originally installed and how best to install the needed flashing materials. I would also suggest removing the the side pieces of exterior trim around the door and checking for water tightness in these areas as well. If you don't feel that you have the skills or tools to do this yourself, then you should hire a qualified contractor to do the work for you. As the leaks have already caused damage to your wood floors, don't delay fixing this problem any longer, as water damage can spread quickly and be costly to fix.

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