Waterproofing in Whatcom County, WA

A dry, clean basement interior in a Whatcom County home following professional waterproofing work, showing sealed concrete walls and a moisture-free floor. The exterior foundation area visible through a window shows proper grading and drainage away from the structure.

Expert Waterproofing in Whatcom County, WA

Waterproofing in Whatcom County is not optional. The county receives around 42 inches of rain per year, with precipitation falling on roughly 162 days annually. That steady, season-long moisture saturates soil around foundations, raises hydrostatic pressure against basement walls, and pushes water into crawl spaces and below-grade spaces. Clay-heavy soils common in the region hold that moisture against your foundation long after the rain stops. Left unaddressed, water intrusion leads to mold growth, structural damage, and compromised indoor air quality. Sherman General Contracting serves homeowners across Whatcom County who are dealing with wet basements, damp crawl spaces, foundation seepage, and poor drainage around their homes. We approach every waterproofing project with the same commitment to quality and integrity that has guided our work since we founded this company. If you are seeing damp walls, musty odors, or standing water near your foundation, contact us to get the right fix in place.

What's included

Reduced hydrostatic pressure against foundation walls, lowering the risk of cracks and water intrusion
Drier basement and crawl space that resists mold and mildew growth year-round
Protected structural framing and concrete from the long-term damage that Whatcom County's persistent moisture causes
Improved indoor air quality by removing the damp conditions that allow mold spores to spread
Greater confidence heading into fall and winter when Whatcom County's rainfall is at its heaviest
Maintained property value by addressing water damage before it becomes a larger structural problem

Custom Home Builder

Commercial Tenant Improvements

Whole House Remodeling

ADU Construction

Family-Owned Approach

More General contractor Services

Show all

Service Areas

Need this service?

Get a clear assessment before you commit.

Call Now

FAQ

Waterproofing FAQ

Common questions about waterproofing in Whatcom County, WA.

How do I know if my Whatcom County home needs waterproofing?

Damp or wet walls, musty odors, efflorescence on concrete, and standing water near the foundation are common signs. Homes across Whatcom County are especially prone to these issues due to the region's heavy seasonal rainfall and moisture-retaining soils.

Does waterproofing cover crawl spaces as well as basements?

Yes, waterproofing addresses both basements and crawl spaces where moisture intrusion is a problem. Many homes in Whatcom County have crawl spaces that collect ground moisture throughout the wet season.

Can waterproofing help if my foundation already has cracks?

Waterproofing work can address existing cracks that allow water to enter your foundation. In Whatcom County, foundation cracks are a common entry point for water during the long rainy season.

Is waterproofing something I should do before or after other renovation work?

Waterproofing should be handled before finishing a basement or crawl space, since moisture problems behind finished walls are harder to detect and fix. Homeowners in Whatcom County who skip this step often face more costly repairs later.

Do you provide waterproofing services outside of Bellingham?

Sherman General Contracting serves homeowners throughout Whatcom County, not just in Bellingham. We also work across Skagit County, Snohomish County, and San Juan County.

What causes water to get into my basement even when it has not rained recently?

Groundwater and hydrostatic pressure from saturated soil can push water through foundation walls and floor joints even between rain events. Whatcom County's clay-heavy soils hold moisture for extended periods, keeping pressure on your foundation long after a storm passes.

Still have questions?

Call us directly. Real answers, no scripts.

Call (360) 821-4481

Client Reviews

What Whatcom County customers say.

5.0

10 Google reviews

Worked with us?

Leave a Review

We loved working with Sam and having him build this wheelchair ramp! He came in under other bids in time frame and cost. Great communicating when he would be on site and when different materials would be available. Respectful of our home and cleaned up really well at the end of the job. Sherman contracting is our new go-to for any contracting job.

Sam came and took a gigantic cottonwood tree down for me at my front driveway. His services were prompt, quality, and affordable. Would recommend to 10/10. Thanks again Sherman General Contracting 🍻

Sherman General Contraction did some significant work on our home. They did a fantastic job and I would highly recommend them. Their lead carpenter was a very skilled craftsman at the highest level.

Look no further. Sam is your guy! We just had a full bathroom remodel done and have nothing but great things to say about Sam and his crew. My husband and I have had one bad contractor experience after another for the last 4 years and Sam restored our faith in the industry. All of them are kind, respectful and skilled at what they do. They did absolutely beautiful work; they paid attention to all of the small details and noticed everything before we did so we didn’t have to point out any touch ups. We had a large amount of tile work and it was executed flawlessly. They finished on time and slightly below the estimate. We couldn’t be happier.

Sam is an excellent and knowledgeable contractor- easy to work with and really knows his stuff!

Find Us

Proudly Based in Whatcom County, WA

Stop by, call, or book online — we're always nearby when you need us.

Phone

(360) 821-4481

Hours

Monday 8:00 AM - 5:00 PM
Tuesday 8:00 AM - 5:00 PM
Wednesday 8:00 AM - 5:00 PM
Thursday 8:00 AM - 5:00 PM
Friday 8:00 AM - 5:00 PM
Saturday Closed
Sunday Closed