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

Alec's Construction air-seals and insulates attics in Selden (11784), 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 Selden

Selden sits on the flat sandy plain in the middle of Brookhaven, between Middle Country Road and the Long Island Expressway, and its housing is 1960s and 70s ranches, splits and high ranches on quarter and half-acre lots under pitch pine and oak. Many have attached garages, and the attic over the garage is often open to the attic over the house. That garage attic is cold and vented to the outside, and where the wall between it and the house attic was never built or never sealed, the house attic shares air with an unheated garage. Basements are common here too, and a damp basement pushes moisture up through the house into the attic. The pines shed needles into the soffits and the oaks shade the north slopes. The high ranches have a long simple attic over the upper floor, and the splits have the compartment over the lower wing that nobody reaches.

What We Look at First in Selden

In Selden we look along the garage line first. Where the house attic runs straight into the garage attic, we close the gap with a sealed wall or dam at the line between them, so the house is insulated as one box and the garage stays outside it. Then the ceiling gets sealed, the soffits cleared of needles and baffled, and the depth blown. On a split, the compartment over the lower wing gets an access if it has none.

Ranches, Hi-Ranches and Shaded Roofs

Selden 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 Selden

Selden files with the Town of Brookhaven at Independence Hill in Farmingville, a few minutes south. 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 Selden, 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

The attic over my Selden house is open to the attic over the garage. Should it be?

No. The garage is unheated and the attic over it is effectively outside. On a lot of Selden ranches and high ranches there is no sealed separation between that space and the attic over the living rooms, so the insulation on the house side has cold air running along the edge of it. Closing that line with a sealed wall or dam lets the house attic be insulated as one box. The wall also has to keep doing its fire-separation job, so it is built with the right materials.

How much attic insulation does a Selden house need?

Current New York energy code calls for a much deeper attic layer than most Long Island houses have — typically more than a foot of loose fill. Depth is only half of it: the attic has to be air-sealed and properly vented first, or added insulation does far less than it should.

Can attic insulation be done in winter in Selden?

Yes, and winter is a good time for it. The work is inside the attic, the material does not care about the weather, and a cold day shows exactly where the house is leaking heat. It is one of the jobs that keeps a crew busy from November to March.

Who issues the permit for attic insulation work in Selden?

Selden files with the Town of Brookhaven at Independence Hill in Farmingville, a few minutes south. 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 Selden through the cold months: Roofing and Windows & Doors.

Also Serving Selden

Talk to Alec's Construction About Attic Insulation in Selden

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.