Spray Foam Insulation Long Island NY

Long Island's post-war housing boom built hundreds of thousands of homes fast — and insulated almost none of them well. The Levitt-style Capes of Levittown and the ranch belt of Nassau County, the split-levels and colonials spreading through Suffolk: most have attics with a whisper of old fiberglass, basements that run damp nine months a year, and oil or gas bills that sting every winter. We bring Brooklyn-grade spray foam work to Nassau and Suffolk County.

Capes, Ranches & Split-Levels

Cape Cods (Levittown, Hicksville, Massapequa) have the classic problem: finished knee-wall attics that bake in summer and freeze in winter. Spray foam behind knee walls and on sloped ceilings transforms these spaces. Ranches across Nassau have simple, accessible attics — a one-day spray foam attic job is the easiest win in home performance. Split-levels and colonials in Suffolk towns like Smithtown, Commack, and Huntington typically need the attic-plus-basement combination.

Basement Moisture: The Island-Wide Issue

Long Island's high water table makes basement moisture the rule, not the exception. Finished basements in Garden City, Manhasset, and Dix Hills look great until the musty smell arrives. Closed-cell spray foam on foundation walls — see our basement insulation service — resists moisture where fiberglass fails, and keeps below-grade living space comfortable year-round. For crawl spaces common in older South Shore homes, full encapsulation ends the cold-floor problem for good.

Area Notes

• Western Nassau (Garden City, Mineola, Valley Stream): Older colonials and Tudors; whole-house residential foam during renovations.
• Central Nassau (Levittown, Hicksville, Bethpage): Capes and ranches — knee-wall and attic specialties.
• North Shore (Great Neck, Manhasset, Port Washington): Larger homes with complex rooflines and finished basements.
• South Shore (Long Beach, Oceanside, Babylon): Coastal humidity and storm exposure — closed-cell foam's moisture resistance matters.
• Suffolk (Huntington, Smithtown, Brookhaven, Islip): Colonials, splits, and new construction; we also handle commercial work along the corridors.

Rebates & Free Estimates

PSEG Long Island and National Grid customers may qualify for insulation rebates and home energy assessments — ask us what's current at your free estimate. We serve all of Nassau and Suffolk, plus Brooklyn, Queens, Manhattan, the Bronx, and Staten Island. Pricing: cost guide · open vs. closed cell.