Foundation Waterproofing in Bellevue

A homeowner in Bellevue, Washington reached out to TF Pro Build after noticing persistent water seepage in their basement. Stains along the concrete walls, standing puddles on the floor, and a musty smell revealed a chronic foundation waterproofing issue. With a luxury home and finished landscaping at risk, urgent action was needed to prevent long-term moisture damage and mold.

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Our Solution:

We designed a comprehensive exterior waterproofing system tailored to the property’s layout, Bellevue’s climate, and the high-value construction of the house:

Step 1 – Site Prep & Excavation

We carefully excavated the perimeter of the foundation down to the footings. Special care was taken to protect the landscaping and maintain access to the backyard.

Step 2 – Surface Cleaning

The concrete foundation was thoroughly cleaned of old sealants, dirt, and biological growth to ensure strong adhesion of new waterproofing materials.

Step 3 – Membrane Application

A multi-layer bituminous waterproofing membrane was applied to the exposed walls. This included a liquid sealant and a high-density polyethylene dimple board for pressure resistance and drainage.

Step 4 – Drainage System Installation

We installed a perforated French drain system with filter wrap and clean gravel along the footing line. This directs water safely away from the foundation into a discharge point.

Step 5 – Final Backfill

The trench was carefully backfilled and regraded to maintain a slope away from the house. Soil was compacted to reduce future settling.

Step 6 – Interior Restoration

We verified that the basement was now dry, sealed, and structurally sound. A new interior waterproof coating was added for additional moisture resistance and aesthetic improvement.

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Result:

The homeowner now enjoys a completely dry, protected basement — even during Bellevue’s heaviest rainfalls. The waterproofing system blends seamlessly with the existing home’s exterior, and no further signs of leaks or dampness have occurred.