Commercial Contractors Serving the Mid-Atlantic Region

Projects & Photos - Waterproofing

SGS installed a vertical subgrade waterproofing system around the perimeter of the building. Additionally, SGS poured 75 yards of concrete to support an environmentally friendly rooftop guard.

Waterproofing and Concrete

Fems 22- Whiting-Turner
 6825 Georgia Avenue NW,
 Washington, D.C.


SGS replaced an old waterproofing system with a new waterproofing membrane and drain tile.

Exterior Waterproofing Membrane with Drain Tile

Patuxent Wildlife Research Center - U.S. Geological Survey
 1200 Beech Forest Rd Laurel, MD


Sculptor Alexander Calder created “Gwenfritz,” a 35 ton sculpture reaching skyward with its jagged angles and rich matte paint. It was relocated to its original location in 2014 with a reflection pool built around the perimeter. SGS installed a waterproofing membrane to keep the reflection pool from leaking and added a decorative vinyl chip flooring system with moisture mitigation.

Waterproofing Membrane

Smithsonian Calder Relocation Project - Grunley Construction
 Company, Inc.
 14th Street and Constitution Ave, NW, Washington, DC


SGS provided urethane injection to seal 81 linear feet of cracks in the ceiling of the parking garage.

Urethane Injection

Petworth Safeway – Duball, LLC.
 3830 Georgia Avenue,
 NW Washington, DC