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ADDITIONS AND DAMP-PROOFING
By Terry Weckwerth
B.A.S.E. Excavations
840 - 2383
Additions to a house can be quite a thorn in the side when damp-proofing a basement. Different types of additions such as a garage, sun porch or even a deck can create problems when you want to access the weeping tile, especially if the added structure does not have a footing with a block wall. Take for instance a block wall in the basement is allowing water to enter where it meets the floor. So now you have to excavate to expose the wall, but a large sun porch is built on sona tubes years after the original house was built. The material must be dug by hand, however with the earth being removed, the foundation post becomes very weak if the surrounding soil erodes, making it very risky to
work under the heavy structure.
In some cases where a garage butts to one side of a house that has a full basement, and the water appears to come in on that abutting wall, one must wonder if there is a weeping tile around the house only or around the house/garage walls or both. At best, the answer isn't known until the point of excavation, because who would know? The question is, if the house walls are in great shape, and there is a major crack under the garage foundation, could water travel down the crack to the footing and travel into the basement of the house? The answer is….most definitely! So keep in mind when damp-proofing your basement walls, you may have to repair the garage foundation and run the weeping tile around the garage and hopefully you may have a weeping tile between the two buildings that can be flushed. And with any other additions, you should have a proper block foundation, if not, ensure the weeping tile is replaced, do not take shortcuts in waterproofing the wall. I also suggest an accessible clean out!!!