Batt Insulation in Washington, DC

Batts are not glamorous, but in a Washington, DC condo or a renovated row house they are often the right tool. Batt insulation goes in fast, costs less than spray foam, and — critically for historic and condo work — does not modify the structural assembly the way an in-place foam application does. Our crews install fiberglass and high-density mineral wool batts to spec for new construction, condo build-outs, and any DC project where the cavities are dry, accessible, and don't need air sealing as part of the install.

Where Batts Are the Right Call in DC

Condo build-outs: Most DC condos do not allow modifications that affect the building's structural assembly, which rules out spray foam in the demising walls. High-density mineral wool batts give you R-15 to R-23 in a 2x4 or 2x6 cavity plus an STC bump for sound, all without changing the wall structure. Furred-out party walls: When we add a furring stud cavity to the interior face of a brick party wall, mineral wool batts (rather than foam) are the HPO-friendly fill — the wall remains demountable. Condo demising walls: Mineral wool's STC and fire rating are ideal for the wall between your unit and the next. New construction: Standard fiberglass at code-compliant R-13 to R-21 in 2x4 and 2x6 walls remains the budget-friendly choice for new Navy Yard and NoMa townhome work.

Fiberglass vs. Mineral Wool — Which to Pick

Fiberglass is the budget choice and performs well in any dry cavity. Mineral wool costs 30-60 percent more but is denser, more fire-resistant (rated to 1,400°F vs. 1,000°F for fiberglass), and noticeably better at blocking sound — usually 4-7 STC points more in a typical wall. For DC condos and any application where a neighbor is on the other side of the wall, mineral wool is almost always the right answer. For attics over conditioned space and standard new-construction walls, fiberglass is fine.

A Local Process, Run From Our Falls Church Shop

DMV Foam is headquartered in Falls Church — about 25 minutes from anywhere in the District. Every project begins with a walkthrough and a clear scope that lists target R-values by area. We pull DCRA permits when required, protect floors and finishes (especially important for hardwood floors in Georgetown and Capitol Hill row houses), and place each batt with full contact so there are no voids or compressions. We work daily across Capitol Hill, Columbia Heights, Georgetown, Navy Yard, Adams Morgan, Dupont Circle, and NoMa, and we know which condo associations require a certificate of insurance on file before our crews can step into the building.