How to Build a Slope to Waterproof the Foundation for an Old House

Moisture near foundations results in wet basements, undermines structural stability and is the source of most complaints from homeowners. Over time, the ground around the house can settle and erode, leaving low spots where water collects and flows toward the foundation. Surface drainage can be amended by building the slope next to the foundation with the appropriate granular base and grading so that positive drainage -- away from the house -- is ensured. Grading and drainage issues are best handled by experienced contractors.

Shovel
Skid steer loader
Well-drained gravel, crush or road mix quality
Vibrating plate compactor

Instructions

- 1
  Excavate organic matter and soft soil from the foundation wall to the established depth suitable for the area, and a distance of not less than 5 feet from the wall. Replace the excavated material with gravel. Plan the finish grade, or surface, for a minimum of 8 inches below the top of the foundation wall.
- 2
  Slope the ground away from the wall at 5 percent, or a 6 inch drop over 10 feet. Compact the gravel in 6 inch layers, or lifts, with the plate compactor. Stop within 4 to 6 inches below grade to allow for landscape materials for finishing.
- 3
  Meet the existing grade at the perimeter of the excavated work. Ensure the drainage is directed toward a swale or ditch system.
- 4
  Add finish landscape material, such as grass or decorative gravel. Place the downspout so that it discharges at least 3 feet from the foundation.

How to Remove an Outside Vent in Brick

What Is Shiplap Siding?

Exterior Remodeling