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Exterior Waterproofing in Kelso, WA — Stop Water Before It Reaches the Wall

Exterior membrane systems, footing drains, and corrected grading tackle Kelso, WA water intrusion at the source, before it ever reaches the interior wall.

Licensed Exterior Waterproofing service in Kelso, WA - SGP Waterproofing
Why Choose Us

Four Reasons Our Exterior Waterproofing Clients Don't Call Anyone Else

A lot of Kelso, WA exterior waterproofing failures trace back to a footing drain that was installed without proper slope, which means it never actually moved water the way it was supposed to. We verify slope during installation, not just at design.

1

Licensed Excavation & Waterproofing Crews

We call in utility locates before any digging starts, standard on every Kelso, WA exterior job.

2

Local Equipment Staging

Excavation equipment and membrane materials are staged locally so an exterior project doesn't wait on out-of-town logistics.

3

Flat-Rate Excavation Pricing

Pricing is quoted per linear foot of foundation wall being treated, based on an on-site measurement, not a phone estimate.

4

Dimpled Membrane & Footing Drain Systems

We install dimpled membrane rated for below-grade use, paired with a footing drain that ties into your existing or new drainage system.

Professional Exterior Waterproofing technician working in Kelso, WA
What We Do

Comprehensive Exterior Waterproofing Solutions in Kelso, WA

We scope every Exterior Waterproofing job in person before quoting it, since two properties with the same symptom rarely need the same fix.

Exterior

Foundation Excavation & Membrane Installation

This is the most comprehensive Kelso, WA waterproofing fix available, addressing the wall itself rather than just managing water after it gets in.

Exterior

Footing Drain (French Drain) Installation

A perforated footing drain collects groundwater at the base of the foundation and routes it away before it can build pressure against the wall.

Exterior

Exterior Grading Correction

We regrade the perimeter to direct surface water away from the wall, typically paired with downspout extensions.

Exterior

Window Well Excavation & Drainage

Window wells collecting water get excavated, fitted with a gravel bed, and tied into the exterior drain system so they stop acting as a funnel toward the foundation.

Exterior

Downspout & Gutter Extension

Downspouts discharging within a few feet of the foundation send roof water directly toward the problem — we extend them well clear of the wall.

24/7 Emergency Exterior Waterproofing experts in Kelso, WA
How It Works

What Happens After You Call SGP Waterproofing for Exterior Waterproofing

01

Call & Exterior Symptom Review

Photos of the exterior foundation area help us plan equipment and access before the visit.

02

On-Site Excavation Assessment

A technician walks the exterior perimeter, checks grading slope, and identifies where excavation would be needed for a membrane or footing drain fix.

03

Written Excavation Quote

We explain what's included in landscaping restoration so there's no confusion after backfill.

04

Excavation, Membrane & Backfill

Excavation, membrane installation, and backfill for a typical residential wall section usually take a few days depending on access and weather.

Customer Reviews

Hear From Kelso, WA Customers We've Already Helped

Top rated local Exterior Waterproofing specialists in Kelso, WA
★★★★★

"Interior fixes hadn't worked for us — turned out the real problem was grading pushing water straight at the foundation. Exterior correction solved it."

— Kelso Homeowner

★★★★★

"Excavation crew was careful with our landscaping and put everything back close to how it looked before."

— Kelso Customer

★★★★★

"Window well kept flooding every storm. They excavated, added drainage, and resealed the window frame while they were at it."

— Kelso Homeowner

★★★★★

"Fast turnaround given how much digging was involved."

— Kelso Customer

FAQ

Exterior Waterproofing Questions We Hear Every Week

What's the difference between interior and exterior waterproofing?

We'll recommend the right approach based on what the inspection actually finds.

Will excavation damage my landscaping?

We discuss landscaping impact during the estimate so there are no surprises.

How deep do you need to excavate?

We measure your specific foundation during the on-site inspection rather than assuming a standard depth.

Is exterior waterproofing more expensive than interior?

We'll walk through both options and their trade-offs so you can make an informed choice.

Can you fix grading without a full exterior membrane project?

We'll recommend starting there if the inspection suggests surface water is the primary cause.

How long does exterior waterproofing take?

Larger projects or difficult access points can extend the timeline, which we'll outline in the written quote.

Service Coverage

Proudly Providing Exterior Waterproofing Throughout Kelso and Kelso, WA

Exterior jobs depend on access and weather — call +1-866-476-1348 and we'll confirm scheduling for your specific Kelso property.

Reliable Exterior Waterproofing contractor in Kelso, WA by SGP Waterproofing
Affordable Exterior Waterproofing solutions in Kelso, WA
Trusted Exterior Waterproofing service in Kelso, WA - SGP Waterproofing

Zip codes we serve in Kelso, WA: 98626 98632

Get Exterior Waterproofing Handled Before It Gets Worse

Call now for a free inspection and a flat-rate quote before anything gets worse.

Call +1-866-476-1348

Our Services in Kelso, WA

Kelso is a city in the southwestern part of the U.S. state of Washington and is the county seat of Cowlitz County. At the 2020 census, the population was 12,720. Kelso is part of the Longview, Washington Metropolitan statistical area, which has a population of 110,730. Kelso shares its long western border with Longview. It is near Mount St. Helens.

Zip Codes in Kelso, WA that we also serve: 98626 98632

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