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Fix It From the Outside In: Exterior Waterproofing in Gaithersburg, MD

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

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Emergency Dispatch
Licensed Exterior Waterproofing service in Gaithersburg, MD - SGP Waterproofing
Why Choose Us

Why Gaithersburg, MD Property Owners Choose SGP Waterproofing for Exterior Waterproofing

A lot of Gaithersburg, MD 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

Exterior work involves excavation near the foundation, and every crew member is trained and insured for that specific scope.

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

Membrane seams are overlapped and sealed to manufacturer spec so the barrier performs as designed for decades, not just years.

Professional Exterior Waterproofing technician working in Gaithersburg, MD
What We Do

What Our Exterior Waterproofing Service Actually Covers

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

We excavate to the footing, apply a dimpled waterproof membrane directly to the foundation wall, and backfill with proper drainage material.

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

Soil that slopes toward the foundation instead of away from it is one of the most common Gaithersburg, MD water intrusion causes, and it's often the cheapest fix on this list.

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 Gaithersburg, MD
How It Works

Our Four-Step Exterior Waterproofing Dispatch Process

01

Call & Exterior Symptom Review

We ask about grading, downspout placement, and where interior water is showing up to narrow down the likely exterior cause.

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

Real Exterior Waterproofing Reviews From Gaithersburg, MD Property Owners

Top rated local Exterior Waterproofing specialists in Gaithersburg, MD
★★★★★

"Membrane and footing drain install took three days but the wall that used to weep every storm has been bone dry since."

— Gaithersburg Homeowner

★★★★★

"They found our downspouts were dumping water two feet from the foundation. Extended them and regraded, and that alone made a noticeable difference."

— Gaithersburg Customer

★★★★★

"Appreciated that they called in utility locates before digging near our gas line."

— Gaithersburg Homeowner

★★★★★

"Footing drain from the original builder had failed completely. New one actually slopes correctly and moves water like it should."

— Gaithersburg Customer

FAQ

Frequently Asked Questions About Exterior Waterproofing

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?▼

Some disruption is unavoidable near the foundation, but we restore grading and replant where reasonable as part of the scope.

How deep do you need to excavate?▼

Excavation typically goes down to the footing, which varies by home but is often four to eight feet depending on foundation depth.

Is exterior waterproofing more expensive than interior?▼

Generally yes, since it involves excavation, but it addresses the source of water intrusion rather than managing symptoms after entry.

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

Exterior Waterproofing Coverage Across Gaithersburg and Surrounding Gaithersburg, MD Communities

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

Reliable Exterior Waterproofing contractor in Gaithersburg, MD by SGP Waterproofing
Affordable Exterior Waterproofing solutions in Gaithersburg, MD
Trusted Exterior Waterproofing service in Gaithersburg, MD - SGP Waterproofing

Zip codes we serve in Gaithersburg, MD: 20899 20878 20879 20877 20884 20885 20898 20882

Gaithersburg, MD's Exterior Waterproofing Crew Is One Call Away

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

Call +1-866-476-1348

Our Services in Gaithersburg, MD

Gaithersburg (/ˈɡeɪθərzbɜːrɡ/ i GAY-thərz-burg), officially the City of Gaithersburg, is a city in Montgomery County, Maryland, United States. At the time of the 2020 U.S. Census, Gaithersburg had a population of 69,657, making it the ninth-largest community in the state. Gaithersburg is located to the northwest of Washington, and is considered a suburb and a primary city within the Washington–Arlington–Alexandria, DC–VA–MD–WV Metropolitan Statistical Area. Gaithersburg was incorporated as a town in 1878 and as a city in 1968.

Zip Codes in Gaithersburg, MD that we also serve: 20899 20878 20879 20877 20884 20885 20898 20882

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