Foundation Waterproofing & Damp-Proofing

Sealed Before Backfill. Protected for Decades.

When groundwater is in play or hydrostatic pressure (groundwater pushing against walls) is a factor, damp-proofing alone is not enough. A true waterproof membrane goes on the exterior wall to keep liquid water out under pressure. We spec the material based on site conditions, expected exposure, and the code the project is being inspected against.

Why This Layer Carries the Load

Heavy clay soils, high groundwater, and freeze-thaw cycles that can swing forty degrees in a day put more pressure on a foundation wall than almost anywhere else in the country. Without effective waterproofing, that pressure shows up as water seepage through cure cracks, damp basement walls, mold in finished spaces, and repairs that should never have been needed.

Waterproofing is not reactive. It is sealed correctly the first time, before backfill ever touches the wall.

Damp-Proofing: The First Layer of Defense

Damp-proofing is the right call for foundations that are not fighting hydrostatic pressure but still need protection from soil moisture. It is a moisture barrier, not a water barrier, and it does its job quietly for the life of the structure.

How we apply Damp-Proofing

Liquid or sheet-applied membranes (eco friendly solvent-based asphalt or rubberized coatings)
Applied directly to exterior concrete or masonry walls
Sealed across cure cracks, form-tie penetrations, and cold joints
Standard for basements, crawlspaces, and foundations in lower-water-table conditions.

Drainage Board: The Layer That Saves the Membrane

A drainage board is a tough, dimpled plastic panel installed over the waterproofed wall before backfill goes in. The dimples create an air gap that gives water a path down to the perimeter drain instead of sitting against the foundation. It also protects the waterproof membrane from getting torn or pinched by rocks in the backfill.

Significantly outperforms gravel-only backfill for water management.
Standard practice in high-groundwater areas and behind retaining walls.

The Full Waterproofing Stack

The waterproof membrane stops liquid water. The drainage board gives water somewhere to go. The perimeter drain takes it away. The vapor barrier handles whatever moisture vapor still tries to migrate up. Every layer working together is what keeps a foundation dry for the life of the structure. That is the install we do. Not one component at a time. The whole stack, on the same job, by the same crew. Done right.