Room-Over-Garage & Addition Insulation in Yonkers, NY

Room-over-garage and addition insulation solves a problem almost every house in Westchester has somewhere: one room that never feels like the rest. It is the bedroom over the attached garage, the family room added in the 1970s, the enclosed porch turned into an office, or the dormer bedroom built into a former attic. These spaces are surrounded by cold on more sides than an ordinary room, and they are often the least carefully insulated part of the house.

Rooms over garages

The floor of a room over a garage has unheated space underneath it, and the batts stapled up between the joists rarely touch the subfloor, so cold air runs freely through the joist bays. Often the bays are open to the outside at the rim or connect to the attic over the garage. We seal the rim and the bay ends, then fill the floor with closed-cell foam against the subfloor or dense-pack the bays from below. Closed-cell foam also helps keep garage air out of the living space.

Additions and sunrooms

Additions built over the decades sit on slabs, crawl spaces or piers, and they meet the original house at roof valleys and side walls that are hard to insulate from inside. We look for gaps where the old roof and the new one meet, missing insulation in sloped ceilings, and open crawl spaces under the floor. Each gets its own fix: foam in tight roof bays, closed-cell under the floor and sealing at the joints.

Converted attics and dormers

Older houses in Yonkers, Pelham and Mount Vernon often have a third-floor room under the roof that was finished decades ago. These rooms have short kneewalls, sloped ceilings and tiny attics. If you are reworking one, spraying foam on the underside of the roof deck brings the whole roof line inside the insulated envelope and gives you more usable space.

What it costs

HomeGuide lists closed-cell foam at $3.00 to $5.00 per square foot installed, and Fixr puts spray foam in new construction at $2.75 to $6.50. A typical room-over-garage floor is a few hundred square feet, so most of these jobs hit the minimum HomeGuide notes of $1,000 to $2,000 or more. Pairing the room with attic or rim joist work on the same visit usually spreads that minimum further.