Attic Insulation in Suffolk County

Blown-in attic insulation runs roughly $1.00 to $2.80 per square foot installed, which puts a typical 1,200 square foot Long Island attic somewhere around $1,700 to $3,400 before rebates. The spread comes from material, target depth, how much air sealing the attic needs first, and whether existing insulation has to be removed. We price it after we have been in the attic and measured, not from the driveway.

Suffolk County sits in climate zone 4, and the Department of Energy recommends R-38 to R-60 for attics here. In blown fiberglass that is roughly 13 to 20 inches of settled depth, and in cellulose roughly 10 to 16 inches. If you can see the tops of your ceiling joists when you look across the attic, you are almost certainly under R-19 and there is a lot of room to improve.

Blown-in for almost every attic we see. Batts have to be cut and fitted around every joist, wire, pipe, and brace, and any gap left behind is a hole in your insulation. Blown-in material flows into those irregular spaces and covers evenly, including over the top of the joists, which stops the framing itself from acting as a thermal bridge. Batts still make sense in a few spots, mainly knee walls and accessible floored areas where you need the insulation to stay put.

Usually, when it is done with air sealing. Ice dams form because heat escaping into the attic melts snow on the warm part of the roof, and that water refreezes when it hits the cold overhang. The fix is keeping heat out of the attic in the first place, which means sealing the leaks and then insulating, and making sure the soffit vents are not blocked. Insulation alone, blown over an unsealed attic floor, often does not solve it.

Yes, and on Long Island capes they are usually the problem. The little triangular spaces behind knee walls are frequently uninsulated, unsealed, and open straight into the floor cavity of the room next to them. That is why the upstairs bedrooms in a cape are cold in winter and unbearable in summer. It takes more care than blowing a flat attic, but it is often the single biggest comfort improvement in the house.

Yes. An uninsulated, unweatherstripped attic hatch is a two by three foot hole in the top of your house. It is one of the cheapest fixes on the list and one of the ones almost every home we look at still needs.

It is a fair question and the honest answer is that we measure rather than guess. Part of the assessment is a blower door test that tells us exactly how leaky the house is now, and BPI standards set a minimum ventilation level we do not seal below. If a house does get tight enough to need mechanical ventilation, we tell you that up front rather than after the fact. In practice, almost no house on Long Island built before 1990 is anywhere near that threshold.

Yes. We run the assessment, submit the work scope for approval before the job starts, and file the rebate paperwork afterward. PSEG sets your rebate tier based on income and address, so we do not quote you an amount until they have confirmed it, and we put the confirmed numbers in writing before you sign.