Exterior French Drain in DC, MD & VA | DMV Waterproofing
Rockville, MD·Kensington, MD·Ashburn, VA·Manassas, VA

GradingShield™ · DC, Maryland & Virginia

Exterior French Drain

Manage water beside your home before it becomes a basement problem.

GradingShield™ collects surface and near-surface water along the foundation perimeter and routes it to an agreed outlet.

Clean gravel being placed over a yellow drainage liner beside the house
Gravel placement over the drainage liner beside the house.

The right repair for your home

When is a shallow drain the right fit?

Water collecting beside the house may call for shallow perimeter drainage. We check the source first: wall leaks may need exterior waterproofing, water beneath the slab may need interior drainage and a sump system, and pooling farther into the lawn may need a broader yard drainage plan.

Our drainage work · Step by step

See what goes into the drain.

Our own crews carry out the work. These three photos show the installation before the final surface finish.

Swipe to follow all 3 stages → · Tap a photo to view it full size.

Shallow perimeter trench beside the house before pipe and gravel installation
Step 1 of 3Shape and check the gradeWe review grading, downspouts and the outlet, then shape the trench. Depth and slope follow the drainage plan for your property.
Yellow liner and fabric-wrapped drain pipe positioned in a shallow exterior trench beside a window well
Step 2 of 3Place the pipe and linerThe specified liner and fabric-wrapped perforated pipe form the collection path. Materials and connections follow the agreed scope.
Clean gravel partly covering the liner and drain pipe during exterior French drain installation
Step 3 of 3Add clean gravelClean gravel fills the collection zone. We complete the agreed outlet connection and surface finish, then review the installation with you.

Dry-well options depend on soil conditions, available fall, capacity and overflow. The outlet is outside these photos.

A written price for your home

What affects the cost?

After inspecting your home, we give you a written scope and price based on:

  • Length & grading: the trench route, ground levels and soil.
  • Access: utilities, window wells, paths and planting beds.
  • Discharge: the outlet, connection length and overflow provisions.
  • Restoration: the agreed surface finish and any related repairs.

Homeowner questions

Before you decide.

Can this be combined with exterior waterproofing?

If both are recommended, we coordinate the wall waterproofing, backfill and shallow perimeter drain in one installation plan.

Does the system need maintenance?

Keep accessible collection and discharge points clear and check them after storms. We explain upkeep for your installation. Review later landscaping or excavation before disturbing the drainage route.

What warranty comes with GradingShield™?

GradingShield™ carries our lifetime written warranty for the covered installation. The supplied document explains coverage, conditions, exclusions and transfer terms. Read our warranty overview →

Licensed & insured Maryland MHIC #167693 Washington, DC Basic Business License #410526000488