Contractor air sealing and insulating an attic on a house in Bohemia, New York

Alec's Construction air-seals and insulates attics in Bohemia (11716), working out of the yard in East Patchogue. Attic work is indoor work, so it runs straight through the winter — and the order matters more than the material: seal the leaks, open the vents, then bring the insulation up to depth.

Attic Insulation in Bohemia

Bohemia's residential streets north of Sunrise Highway are 1960s and 70s ranches and splits on quarter-acre lots, cut out of pitch pine and oak that were left standing over the houses. Those pines shed needles all year, and pine needles do two things to an attic: they pack the gutters so meltwater backs up under the shingles at the eave, and they clog perforated soffit vents until the attic has no intake at all. The ranches are long single attics and the splits are the usual broken-up compartments with one access. Most have a few inches of original batt and a lot of history above the ceiling — a bath fan or two, a kitchen fan, cable runs, and often the ductwork for a central air system running through the cold attic. On flat sandy ground with no tidal water, it is the trees and the house itself that decide how the attic behaves.

What We Look at First in Bohemia

Ductwork comes first in a Bohemia attic, if there is any. A central air system with its ducts in the attic is pushing heated or cooled air through the coldest and hottest space in the house, and leaky joints dump it there. We seal the joints and get the ducts buried in the new insulation or wrapped where they sit high. Then the soffits get cleared of needles and baffled, the ceiling gets sealed, and the depth goes on.

Ranches, Hi-Ranches and Shaded Roofs

Bohemia is mostly ranches, capes and hi-ranches under pine and oak, and the attics are open and easy to reach — which makes them some of the most worthwhile insulation jobs on the Island. What we usually find is an original layer that has settled well below where it should be, insulation pulled back around the hatch, bath fans dumping into the attic, and soffit vents blocked by insulation pushed into the eaves.

The order of work fixes all of it: seal the ceiling penetrations and top plates, run bath fans to the outside, put baffles in at the eaves so the soffits breathe, then blow in loose fill to full depth across the whole floor, with a dam around the hatch.

The trees matter too. A roof shaded by tall pines holds snow on its north side for days, and if the attic below is warm the snow melts and refreezes at the eave. A cold, well-sealed attic is what stops that.

Ice dam and icicles along the eave of a Long Island house in winter

The Order of Work

Air sealing first, because insulation is a filter, not a barrier — warm air moves straight through loose fill and batts. Every hole between the living space and the attic gets sealed: light boxes, the hatch, wiring and plumbing penetrations, chimney chases with fire-rated material, and the tops of the walls.

Then ventilation. Baffles at every rafter bay keep the soffits open so outside air can move under the roof deck, and bath fans get ducted outside instead of into the attic. Then depth: loose fill blown evenly across the attic floor to the depth the code now calls for, with a dam around the hatch so it stays put. You get the before-and-after photographs.

Permits in Bohemia

Bohemia files with the Town of Islip on Main Street in Islip hamlet. Insulation and air sealing inside an existing attic are generally not permitted work; anything that changes the roof, the framing or the ventilation openings can be, and we check with the department where it applies.

Alex walks the house in Bohemia, photographs what he finds and gives you a written scope in the order the work has to happen — whether or not you hire us. Call (631) 312-7441 to set up a time.

Frequently Asked Questions

My Bohemia ranch has air-conditioning ducts in the attic. Do they affect the insulation work?

They are part of it. Ducts in the attic carry conditioned air through a space that is close to outdoor temperature, and on a lot of Bohemia ranches the joints were taped decades ago and the tape has let go. That air ends up in the attic instead of the rooms. Sealing the joints with mastic and burying the ducts under the new insulation, or wrapping them where they sit high, keeps the air in the house. The ceiling still gets sealed underneath them.

Will new insulation stop ice dams on my Bohemia roof?

Insulation alone often does not. Ice dams come from warm air leaking into the attic and heating the roof deck, so the fix is air sealing the ceiling, opening the soffit vents with baffles, and then adding depth. Done in that order, it is the real cure.

Should I remove old insulation in my Bohemia attic first?

Usually not. Old insulation that is dry and clean can stay, and new insulation goes over it once the air sealing is done. It comes out when it is wet, mouldy, contaminated by animals or so packed down that it hides the bypasses we need to seal.

Who issues the permit for attic insulation work in Bohemia?

Bohemia files with the Town of Islip on Main Street in Islip hamlet. Insulation and air sealing inside an existing attic are generally not permitted work; anything that changes the roof, the framing or the ventilation openings can be, and we check with the department where it applies.

Related Guides

Work With Alec's Construction

This page is written by the crew that does the work. See Alec's Attic Insulation service — air sealing, baffles and insulation depth in the order that makes it work. One crew from the first walkthrough to the last inspection.

Also in Bohemia through the cold months: Roofing and Windows & Doors.

Also Serving Bohemia

Talk to Alec's Construction About Attic Insulation in Bohemia

We come out, look at the house, photograph what we find and put a written scope in your hand. No pressure, no obligation. Working across Suffolk County since 2018.

Or call (631) 312-7441

No cost, no obligation. We reply the same day.