Commercial Contractors Serving the Mid-Atlantic Region

Projects & Photos - Grouting

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


SGS pumped high strength NS grout between 87 columns and metal jackets in order to strengthen floor support columns.

Jacket Grouting

Hoffman Town Center - Structural Group
 2034 Eisenhower Avenue, Alexandria, VA


Formerly the Lorton Prison, this historic structure has been restored to art galleries and studios and also hosts live performances. Due to the fact that the underground utility tunnels were aging and contaminated with asbestos, SGS filled all underground utility tunnels to the ceiling with approximately 2,500 cubic yards of grout.

Void Filling, Tunnel Grouting

Lorton Workhouse Arts Center - HITT Contracting
 9520 Workhouse Road Lorton, VA


SGS sealed leaks around conduits using waterproofing gel grout between the conduits and the conduit sleeves.

Acrylamide Grouting, Conduit Sealing

UMUC Academic Center at Largo - PEPCO
 1616 McCormick Drive Largo, MD


The Woodrow Wilson Memorial Bridge spans the Potomac River between Alexandria, VA. and Oxon Hill, MD. SGS was originally hired by Potomac Crossing Consultants in 2004 during the replacement project. Once on site, several other companies hired SGS for the project in the ensuing years. Initially, SGS completed epoxy injections into cracks in the precast structures being manufactured on site using man lifts and barges. Later in the project, SGS injected voids around the anchor heads of the post-tension cables. Finally, SGS designed a camera and remote packer system to seal the leaking joints in the post-tension conduits that were placed in the foundation below the water table.

Epoxy Injection
 and Waterproofing

The Woodrow Wilson Memorial Bridge


SGS provided urethane injection to stop water leaks in the walls, floors, and ceilings below grade throughout the museum.

Urethane Injection

Smithsonian National Museum of African American History
 and Culture
 1400 Constitution Ave., NW Washington DC