PE-backed leak investigation and self-performed waterproofing for Arlington's offices, mixed-use buildings, condominiums, and parking structures — from Rosslyn to Crystal City.
Search for waterproofing in Arlington and you'll find residential basement franchises. But a 1980s Rosslyn office tower, a Crystal City parking structure, or a Columbia Pike mixed-use building doesn't leak the way a house does — and it can't be fixed with a sump pump and a dehumidifier. Commercial buildings fail at plaza decks, façade sealant joints, below-grade walls under landscaped courtyards, and roof-to-wall transitions. Diagnosing them takes engineering judgment; repairing them takes crews who can work in occupied buildings without shutting your tenants down.
That is exactly what OAK Builders' waterproofing division does. We are a licensed Class A commercial general contractor headquartered ten minutes away in Falls Church, with a licensed structural engineer (PE) on the team and a principal who managed building-envelope rehabilitation programs for federal landmark buildings — 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.
Below-grade leaks into occupied lower levels and garages; plaza deck and balcony failures over habitable space; saturated masonry and failed sealant joints on wind-exposed high-rise façades; expansion joints past their service life; chronic "roof leaks" that are actually flashing and transition failures; and condensation or vapor problems misdiagnosed as leaks. We serve office buildings, condominium and HOA communities, retail, medical, institutional, and parking structures throughout Arlington — Rosslyn, Courthouse, Clarendon, Ballston, Crystal City, Pentagon City, Shirlington, and Columbia Pike.
Every Arlington project follows the same six-step discipline: Assess (non-destructive moisture survey), Diagnose (controlled water testing to reproduce the leak), Design (a PE-backed repair with a line-item budget), Repair (our crews, phased for occupied buildings), Verify (post-repair water testing, documented), and Warrant (written workmanship warranty plus manufacturer system warranties). One contract, one accountable team — no investigator, designer, and installer pointing fingers at each other while your building keeps leaking. Read more about our full waterproofing systems and leak investigation service. We provide the same service in Alexandria, VA, Fairfax, VA, and Bethesda, MD.
Call (826) CALL-OAK · 826-225-5625
Email info@oakcgc.com
or use our Request Estimate form.
Residential basement companies typically install interior drainage and sump systems. Commercial buildings usually fail at the envelope — plaza decks, façade joints, below-grade membranes, flashing transitions — and the fix is engineering-driven repair of the actual water path, often executed from the exterior and phased around tenants. That's the work OAK self-performs.
Yes — occupied-building work is our specialty. Off-hours phasing, protection, freight-elevator logistics, and coordination with property management are planned into the price up front, not discovered mid-job.
Yes. We work with associations and their property managers on garage, balcony, plaza, and façade water intrusion — including engineering documentation boards need for reserve planning.
It depends on building size and access, but every assessment is quoted flat-fee up front and delivers a written findings report with a prioritized, line-item repair budget — a document you can act on, whether or not you hire us for the repair.
Assessment scheduled within days. Diagnosis you can trust, repair by the same team, water-tested before we leave.