How To Seal A Basement Wall From The Outside
Waterproofing the basement wall from the outside is a more permanent solution than sealing it from the inside. However, it is also more expensive and requires excavation, which can be disruptive. Here are the steps on how to seal a basement wall from the outside:
1. Excavate the soil around the basement wall to a depth of at least 6 inches below the bottom of the footing. The width of the excavation should be at least 2 feet wider than the wall on either side.
2. Clean the basement wall of any dirt or debris. Repair any cracks or holes in the wall with hydraulic cement.
3. Apply a coat of waterproofing membrane to the basement wall. The membrane should be thick enough to resist puncture and should be applied according to the manufacturer's instructions.
4. Cover the waterproofing membrane with a layer of rigid insulation. The insulation will help to keep the basement wall warm and dry.
5. Backfill the excavation with compacted soil. The soil should be compacted in layers to prevent settling.
6. Install a drainage system around the basement wall to collect and divert water away from the wall. The drainage system can be a French drain or a sump pump.
7. Grade the soil around the basement wall so that water flows away from the wall. The slope should be at least 2%.
Sealing the basement wall from the outside is a major project, but it is the most effective way to waterproof the basement. By following these steps, you can help to keep your basement dry and comfortable.
Here are some additional tips for sealing a basement wall from the outside:
- Use a high-quality waterproofing membrane. The membrane should be thick enough to resist puncture and should be applied according to the manufacturer's instructions.
- Overlap the waterproofing membrane by at least 6 inches at all joints. This will help to prevent water from seeping through the joints.
- Install a drainage system around the basement wall to collect and divert water away from the wall. The drainage system can be a French drain or a sump pump.
- Grade the soil around the basement wall so that water flows away from the wall. The slope should be at least 2%.
By following these tips, you can help to keep your basement dry and comfortable.
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