Is your basement cold, damp, or musty? Are you noticing chilly floors above or high heating bills in winter? The problem could be poor or missing insulation. At Spray Foam Long Island, we help Long Island homeowners make their basements warmer, drier, and more energy-efficient with high-performance spray foam basement insulation.
Whether your basement is finished or unfinished, properly insulating the walls and rim joists can stop heat loss, prevent moisture problems, and improve the comfort of your entire home.
Basements are surrounded by concrete or block walls that easily allow heat to escape and cold or damp air to enter. Without insulation, this space becomes a drain on your energy efficiency and a potential magnet for mold and moisture.
Spray foam insulation is the best choice for basements because it insulates and seals in one step. Unlike fiberglass or foam board, closed-cell spray foam adheres to uneven surfaces and creates a continuous barrier against air and moisture.
Our professional insulation team uses a step-by-step process to insulate your basement safely and thoroughly:
We evaluate walls, floors, and rim joists for any signs of standing water, leaks, or structural issues before we insulate.
We cover nearby items and ensure all surfaces are safe for foam application.
We apply closed-cell foam to basement walls and foundation perimeters, sealing out air and moisture completely.
We seal the critical area where the basement ceiling meets the exterior wall (see more below).
After the foam cures, we do a full cleanup and can advise on any required thermal barriers (e.g., drywall for code compliance in finished spaces).
Before – Uninsulated basements are prone to cold, moisture, and energy loss. After – Spray foam creates a dry, energy-efficient environment ready for storage, living, or finishing.
The rim joist, the space between the basement ceiling and the first-floor subfloor, is one of the biggest sources of energy loss in a home. It’s a hidden culprit for drafts, moisture intrusion, and even pests.
We use spray foam to seal rim joists, creating an airtight thermal barrier in this often-overlooked space.
If you’re insulating your basement, rim joists are a must for full comfort and energy performance.
Spray foam is a long-term solution that can last 30 years or more without sagging, shifting, or losing effectiveness.
Absolutely. Even if you're not using the space, insulation prevents heat loss and helps maintain more consistent temperatures upstairs.
Yes. Once cured, spray foam is safe and does not off-gas. Many homeowners use their newly insulated basements for storage, hobbies, or as a future finished space.
Most Long Island basement insulation projects range from $2,000 to $6,000, depending on square footage and access. We offer free estimates and fair, transparent pricing.
Take control of basement cold, drafts, and moisture. Let our Spray Foam Long Island experts show you how to make your home warmer, drier, and more efficient, starting from the ground up.
Contact us for a free basement insulation inspection and estimate, no pressure, just professional guidance.
