Rotten Rim Joist

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Posted by: from Gatineau
6/13/2011 at 9:12:15 PM

We had a leak in the corner of the basement, where the wooden rim joist meets the cement foundation. We fixed the leak but have noticed that the bottom of the rim joist where it meets the foundation is rotten. We can literally pull the wood apart with a screw driver. This is true for about 1inch of the bottom of the rim joist and goes on for about 2 arms length.

Any ideas of what can be done to fix it?

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Date/Time6/22/2011 at 8:43:01 PM

First, you have to address the source of water that is causing the damage. Without seeing the site it is difficult to fully address your questions accurately, but rim joists can be replaced. Typically the floors josts are tempory supported and the rim is addressed from the exterior. It is also important to assess whether the mud plate and studding in the area is affected as well. It would be best to post this project on the site and have some with experience come and assess the project .


Kingsway Construction inc

Glenn Rosborough

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Mindy in Gatineau
Date/Time6/26/2011 at 5:15:31 PM

Hi Glenn, thanks for your reply. We do not have access to the rim joist from the exterior unless we take down the brick. So we are trying to replace it from the inside.

Another question for you... we've noticed that we can see the back of the brick from the inside of the basement. There was a vapour barrier of some kind between the brick and house but with all the water damage it has fallen apart. Is this barrier required? What would happen if we don't replace it?


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