Suffolk County, Nassau County, the North Fork, the South Fork & the Hamptons

High-Performance Spray Foam Insulation & Energy Solutions

Suffolk County, Nassau County, the North Fork, the South Fork & the Hamptons

High-Performance Spray Foam Insulation & Energy Solutions

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$1,000 Off Spray Foam Project for New Customers

• Serving The Hamptons & Gold Coast

Luxury Roof Installations & Replacements

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$1,000 Off Spray Foam Project for New Customers

Serving Long Island, Suffolk County, Nassau County, the North Fork, the South Fork & the Hamptons

High-Performance Spray Foam Insulation & Energy Solutions

Dramatically Reduce Your

Energy Costs & Boost Comfort

Dramatically Reduce Your Energy Costs & Boost Comfort

Thermathec is Long Island’s trusted expert in spray foam insulation, waterproofing, air sealing, soundproofing, thermal sealing, and moisture barrier protection. With over a decade of field experience, SPFA PCP-Certified Technicians, and industry-leading materials, we provide homeowners with reliable, long-lasting solutions designed specifically for Suffolk County’s coastal weather, humidity, and year-round temperature swings.

Whether you’re upgrading an existing home, finishing a basement, preparing for a remodel, or building new construction, we deliver systems that dramatically reduce energy costs, boost comfort, and protect your home from moisture, noise, drafts, mold, and structural issues. From Shirley to Riverhead, from Greenport to Montauk, and throughout Nassau County, we help homeowners achieve healthier, safer, quieter, and more efficient homes—built to last in the unique climate of Long Island.

Upgrade Your Home's Performance

Invest in comfort, efficiency, and long-term home value—contact us now to get started on your full-home upgrade.

Benefits of High-Performance Insulation

A well-insulated home is more than warm in the winter and cool in the summer—it’s healthier, quieter, safer, and more efficient. Our solutions provide full-home improvements that make a measurable difference in your comfort and long-term home value.

• Lower monthly energy bills in every season
• More consistent indoor temperatures across all rooms
• Better indoor air quality & reduced allergens
• Moisture control & mold prevention
• Quieter living spaces with less outdoor noise
• Stronger home structure with sealed gaps & reinforced insulation
• Higher resale value, especially in the Hamptons & East End

Who We Work With

Thermathec provides solutions for all residential applications across Long Island, Suffolk County, Nassau County, the North Fork, the South Fork, and the Hamptons.

Who We Work With

Thermathec provides solutions for all residential applications across Long Island, Suffolk County, Nassau County, the North Fork, the South Fork, and the Hamptons.

Waterproofing Services

Protect Your Home’s Foundation from Water, Moisture & Flooding

Long Island’s coastal climate brings heavy humidity, high groundwater, and frequent storms—making waterproofing essential for homes in Suffolk County, the North Fork, the South Fork, and the Hamptons. Thermathec’s waterproofing system combines spray foam waterproofing, tar application, and Blueskin wrap to create an impenetrable shield against water intrusion.

Basements and foundations in areas like Southold, Cutchogue, Greenport, Mattituck, Hampton Bays, Sagaponack, and East Hampton face constant environmental pressure. Our waterproofing stops water seepage through cracks, porous concrete, and foundation gaps—protecting everything from structural framing to finished basements.

A properly waterproofed basement dramatically improves indoor air quality, reduces humidity, eliminates musty odors, prevents mold growth, and preserves storage or living space. For Long Island's coastal and aging homes, this service is a major factor in maintaining long-term safety, comfort, and home value.

• Prevents flooding and water intrusion
• Reduces humidity and musty basement odors
• Protects stored belongings & finished areas
• Prevents mold & mildew growth
• Improves indoor air quality throughout the home
• Increases usable living space (offices, gyms, bedrooms)
• Enhances home value—critical in East End markets
  

Air Sealing Solutions

Eliminate Drafts, Improve Air Quality & Lower Energy Costs

Homes in Long Island often lose conditioned air through small gaps around windows, doors, and attics. Thermathec’s air sealing service utilizes Hydrogap, Blueskin, and Vapor Shield to eliminate air leaks and create a tighter building envelope.

This is particularly beneficial on the North and South Forks, where coastal winds and temperature swings can cause drafty, uneven homes that are costly to heat or cool. Air sealing stabilizes indoor temperatures, reduces HVAC strain, improves air quality, and prevents moisture issues that can lead to mold or wood damage.

• Reduces energy waste & improves efficiency
• Stops drafts and hot/cold spots
• Protects against outdoor allergens & pollutants
• Improves overall indoor air quality
• Enhances home durability & moisture control
• Ideal for older homes across Suffolk & Nassau
  

Soundproofing Services

Transform Your Home into a Quiet, Private, Peaceful Environment

As Long Island neighborhoods grow and more homeowners work remotely, soundproofing becomes essential. Thermathec installs professional-grade Fiberglass and Rockwool insulation to reduce noise between rooms, floors, and exterior walls.

From waterfront homes in the Hamptons, to multi-family properties in Nassau County, to quiet residential houses across Suffolk County, soundproofing provides comfort, privacy, and tranquility. It’s ideal for bedrooms, nurseries, home offices, rental units, entertainment rooms, and home studios.

Soundproofing also improves HVAC efficiency by eliminating air pathways that carry sound and cause temperature imbalance.

• Blocks outdoor noise (traffic, neighbors, storms)
• Reduces noise transfer between rooms & floors
• Enhances sleep and overall well-being
• Ideal for home offices, media rooms & rentals
• Adds value—especially in Hamptons & East End markets
• Improves comfort in large or multi-story homes

Thermal Sealing

Create a High-Efficiency, Temperature-Stable Home

Thermal sealing is one of the most effective ways to improve whole-home comfort. Using Open Cell and Closed Cell Spray Foam, we build a thermal barrier that prevents heat transfer and stabilizes indoor temperatures—particularly important in Suffolk County’s hot summers and cold winters.



Ideal for attics, crawlspaces, rim joists, exterior walls, and new construction, thermal sealing eliminates the uncomfortable temperature variations common in older Long Island homes. It improves HVAC performance, enhances air quality, and protects your home from moisture and environmental damage over time.

• Reduces heating & cooling bills
• Eliminates uncomfortable hot & cold rooms
• Prevents moisture, dust, allergens & insects
• Protects attics & crawlspaces
• Strengthens structural integrity
• Ideal for both new homes and renovations

Moisture Barrier Installation (Vapor Barriers)

Protect Your Home from Humidity, Mold & Structural Damage

Long Island’s coastal humidity, combined with older construction and high water tables, makes moisture control essential. Thermathec installs Closed Cell Foam moisture barriers in basements, crawlspaces, attics, bathrooms, exterior walls, and floor systems to prevent moisture migration.

A proper vapor barrier keeps surfaces dry, protects flooring and framing, eliminates odors, prevents mold, and makes living spaces noticeably more comfortable.

This service is especially effective in homes on the North Fork, South Fork, Hamptons, and throughout Suffolk County, where humidity levels are consistently high and moisture damage is common.

• Eliminates moisture buildup & mold risk
• Reduces humidity & musty odors
• Prevents wood rot & structural damage
• Keeps pests away from crawlspaces & basements
• Stabilizes indoor temperatures
• Ideal for coastal and older Long Island homes
  

Premium Insulation Products

Thermathec uses only high-quality, industry-leading insulation materials engineered for Long Island’s weather, humidity, and structural needs.

About Thermathec

Family-Owned | SPFA Certified | Serving Long Island for Over a Decade

Thermathec is a trusted, family-owned insulation and moisture-control company serving homeowners throughout Long Island, Suffolk County, Nassau County, the North Fork, the South Fork, and the Hamptons. Since our founding, we’ve stayed committed to delivering premium results, superior craftsmanship, and honest, dependable service.

We combine certified technicians, state-of-the-art products, and practical expertise to provide solutions tailored to Long Island's unique climate challenges. From luxury waterfront estates to traditional family homes, we help create healthier, safer, more energy-efficient environments that stand the test of time.