Exterior waterproofing consists of many elements working together to keep your Toronto area home dry and free of leaks. Waterproofing should not be confused with damp-proofing. Many older homes were constructed with damp-proofing, but are not necessarily waterproofed. Damp-proofing consists of a thin tar-like substance that is rolled on like paint. This application does not prevent cracks or keep water out of cracks that do develop.

Some older homes are more prone to leakage and water damage due to the construction standards of the time. Concrete block and brick foundations can develop cracks and shifting over time. Even poured concrete walls in newer homes can develop problems – especially in areas where many homes are being constructed over a very short period of time. Soil conditions can also cause problems. Clay, which contracts and expands during the freeze-thaw cycle, does not allow proper drainage and can create pressure against below-grade structures resulting in cracks and shifting.

What Is Exterior Waterproofing?

Exterior waterproofing is a system of drainage and water barrier elements that keep below-ground structures free of water leaks and dampness. It is usually applied to basement walls and foundations, but can also be applied to above ground structures that may be prone to water damage, pooling or drainage issues.

While all jobs are customized to the needs of your home, below is an overview of the basic procedure:

Concrete Block and Brick Foundations:

1. Foundation wall is excavated down to the bottom of footing.
2. Dirt and debris are cleaned off foundation wall.
3. Exposed foundation wall is parged using pre-mixed parging mix.
4. Foundation coating is applied to parged wall.
5. Drainage membrane is installed on exterior wall.
6. New 4″ perforated weeping tile w/ filter cloth is installed.
7. ¾ clear gravel is installed over the weeping tile for maximum drainage (Once the membrane and gravel are installed, this will allow any water from above or below grade to drain into the system).
8. Excavation is backfilled and compacted.
9. Soil is graded away from home.

Poured Concrete Walls:

1. Foundation wall is excavated down to the bottom of footing wherever cracks have been found.
2. Dirt and debris are cleaned off foundation wall.
3. Cracks are grinded out from top to bottom to allow new cement to penetrate properly.
4. Exposed cracks are filled using hydraulic cement.
5. Foundation coating is applied to cemented cracks and on the wall on either sides.
6. Drainage membrane is installed on exterior wall.
7. New 4″ perforated weeping tile w/ filter cloth is installed (where required).
8. ¾ clear gravel is installed over the weeping tile for maximum drainage (Once the membrane and gravel are installed, this will allow any water from above or below grade to drain into the system).
9. Excavation is backfilled and compacted.
10. Soil is graded away from home.

25 Year Transferable Waterproofing Warranty