Generally, block foundations need leak or crack repairs. Depending on the severity of the repair and your dedication, you can generally fix these problems without having to call a professional. If you think the task too daunting, don’t be ashamed to call in a contractor. But if you’re up to the challenge, gather the proper supplies and begin your repair adventure.
1. Evaluate the leak. If it is small and insignificant, it is probably not worth the money it will cost to fix it. If it is caused by surface water rather than ground water, you may be able to divert the water’s path and avoid the repair.
2. Dig a large, deep trench along the block wall where the leaking is coming from. Dig all the way to the area where the foundation meets the surface of the ground. For example, if you have a basement, dig outside the wall from the ground to just below the basement floor.
3. Mix the cement plaster until it is a smooth consistency. Climb into the ditch you made with your cement and a flat trowel.
4. Smooth the plaster over the surface of the block wall. Create a thick, even coat across the entire affected area. Wait about two days for the plaster to dry.
5. Climb back into the ditch with a clean trowel and spread the foundation tar across the hardened cement plaster in a thick, even coat. Wait another two to three days for the tar to dry.
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