Water is the most expensive thing that ever gets into a building. OAK Builders' dedicated waterproofing division finds it, stops it, and keeps it out — from foundation to parapet — across Washington DC, Maryland, and Northern Virginia.
The DMV's building stock is aging into exactly the problems we know best: failed below-grade membranes, saturated masonry, leaking plaza decks, and sealant joints past their service life. Waterproofing is now a core OAK Builders service line — not a trade we broker out, but work we assess, design, and self-perform.
It's a natural path for us. Our principal managed building-envelope rehabilitation programs on the owner's side — exterior stone restoration and repointing at the National Building Museum, a building envelope study for OPM headquarters, and three phases of VDOT building-envelope rehabilitation at $2.8M each. Our team includes a licensed structural engineer, so diagnosis and repair design carry a PE's judgment, not a salesman's.
Most water intrusion drags on because the investigator, the designer, and the installer are three different companies pointing at each other. At OAK they're one contract: we find the source, engineer the fix, install it, and water-test it before we call it done.
Foundation membranes (hot/cold fluid-applied and sheet), bentonite systems, blindside waterproofing, and crystalline treatments for new and existing structures.
Drainage board, footing drains, French drains, sump systems, and site grading corrections that move water away from the structure for good.
Vehicular and pedestrian traffic coatings, hot rubberized asphalt assemblies, and split-slab waterproofing for plazas, terraces, balconies, and parking structures.
Joint sealant replacement, penetrating masonry water repellents, and elastomeric coatings that stop wind-driven rain at the wall.
Cutting and repointing deteriorated mortar joints, brick and stone replacement, and lintel repairs — preservation-grade where the building demands it.
Building expansion joint systems, precompressed foam joints, and full recaulking programs with documented adhesion testing.
Base flashings, counterflashings, coping, through-wall flashing, and roof-to-wall transitions — where most 'roof leaks' actually live.
Negative-side crystalline systems, interior drainage channels, and vapor mitigation where positive-side access isn't feasible.
A leak isn't fixed until it's reproduced, traced, repaired, and water-tested. That's the path every OAK waterproofing project follows.
Moisture survey and leak history review — non-destructive first: infrared, moisture metering, visual survey of the full envelope.
Controlled water testing to reproduce the leak and isolate the true source — not just the symptom stain.
A PE-backed repair design with materials, details, and phasing matched to your building — and a line-item budget.
Execution by our crews with manufacturer-certified installers where warranties require it, protected and phased for occupied buildings.
Post-repair water testing to prove the fix before we leave — documented and photographed.
Written workmanship warranty, manufacturer system warranties where applicable, and an annual envelope maintenance option.
Start with an Assessment About Our Leak Investigations → Waterproofing in Arlington, VA →
Call before the damage compounds — assessment scheduled within days, report with real budget numbers, repair by the same team.