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Hi my backdoor sub sill is all rotted. What are my options? I have an open basement underneath, so is it possible to replace the sill from the basement?
If it's a standard 1X sill and you have the room you should be able to replace it from either side. It intales jacking up the joists, basicly lifting the house off the sill. The problem is the the jacks need to be close to the outer wall near the sill or installed on the outside.