Insulation Contractor in Mamaroneck, NY

If you own a home in Mamaroneck, it was most likely built before 1940. In fact, nearly 40% of Mamaroneck’s housing stock predates World War II — making it one of the oldest collections of residential homes in the United States. Many of these historic homes are beautiful and stately, but they’re also some of the hardest to keep comfortable year-round, and the most likely to be leaking energy through their, attics, rim joists, walls and crawl spaces.

At Koala Insulation of the Sound Shore, we’ve worked on homes in and around Mamaroneck and the surrounding Sound Shore communities. We know the specific challenges these homes present — and we know how to fix them. I should know – I myself have lived here for the past 8 years!

Why Mamaroneck Homes Need Special Attention

Age isn’t the only challenge we face when we insulate homes in Mamaroneck. Proximity to Long Island Sound creates a humid environment that accelerates moisture intrusion, which makes air sealing more critical than in inland communities, and increases the risk of mold developing inside wall cavities and attic spaces where old or failing insulation has compressed over decades. That’s why you’ll see air sealing as a prominent line on every estimate we create for homeowners in this coastal community. Insulating without air sealing is only doing half of the job!

The typical pre-war home in Mamaroneck was built before there were even standardized guidelines for how to insulate homes, and well before the advent of some of the modern insulation materials that we have available today.

Many have:

• Uninsulated or severely underinsulated attics with original fiberglass or mineral wool that has compressed to a fraction of its rated R-value (which was already a fraction of what would be required under modern standards!)
• Balloon-frame wall construction — a framing style common before 1940 where interior wall cavities run continuously from basement to attic, creating a chimney effect for heat loss and cold air infiltration
• Uninsulated rim joists where the floor framing meets the foundation wall — one of the single highest-impact areas we can address in any older home, and a major contributor to draftiness from what is known as the “stack effect” (we’ll explain it all in detail during our free evaluation!)
• Crawl spaces that are open to outdoor air and humidity, contributing to cold floors, moisture problems, and high electricity and gas bills
• Ice dam vulnerability caused by heat escaping through under-insulated attic floors and melting snow on the roof in winter (did you know that fast-melting snow on a roof is a sure sign of poor attic insulation??)

These aren’t just cosmetic issues – in a Mamaroneck home with a median value over $1 million, poor insulation is silently eroding both your comfort and your property’s long-term performance. You may not see it, but you (and your wallet) feel it!

Our Services in Mamaroneck

We offer a full range of insulation and air sealing services tailored to the specific needs of homes along the Sound Shore:

Blown-In Cellulose & Fiberglass Insulation

Hands down, the best solution for attic floors and existing wall cavities in older homes. Blown-in insulation fills gaps and voids that batt insulation can’t reach, and it can be installed without opening walls — critical in a community where preserving original character matters. It also resists pest intrusion and retains its installed R-value for many years to come.

Spray Foam Insulation

We install both open-cell and closed-cell spray foam for attic roof decks, rim joists, crawl space walls, and areas requiring both insulation and a moisture barrier. Closed-cell spray foam is particularly well-suited for Mamaroneck’s coastal moisture environment.

Dense-Pack Wall Insulation

Our most common solution for balloon-frame homes. We dense-pack wall cavities through small (2.5 inch), easily-patched holes — no major demolition required — delivering R-values that can cut heating costs dramatically.

Air Sealing

Often the highest-return single investment in an older home. We locate and seal the hidden gaps, bypasses, and penetrations that allow conditioned air to escape and unconditioned outdoor air to enter. In a blower door test, a typical pre-war Mamaroneck home may have the equivalent of a window (or even several windows!) left open year-round. We perform blower door tests before and after each project to confirm that we meaningfully “tighten” each home’s building envelope.

Crawl Space Encapsulation

We encapsulate and insulate crawl spaces to control moisture, improve air quality, and eliminate the cold-floor problem common in older homes with uninsulated subfloors above unconditioned spaces – in other words, we can make that perpetually cold kitchen floor above the crawl space nice and warm, and keep the odors and humidity outside, where they belong!

Insulation Removal & Replacement

When existing insulation is damaged, contaminated, or simply too old and degraded to be worth supplementing, we remove it safely and start anew.

NYSERDA and ConEd Rebates Available in Mamaroneck

Mamaroneck residents are eligible for up to $5,000 in rebates that can significantly offset the cost of insulation and air sealing work:

• NYSERDA Comfort Home Program — Rebates of up to $3,000 for qualifying insulation and air sealing improvements in existing homes. Koala Insulation of the Sound Shore is one of the leading contractors in the Comfort Home program and has completed 100’s of projects under the program.
  
• ConEd Weather Ready Home Program — For ConEd customers, additional incentives are available for weatherization work including insulation and air sealing. We handle the paperwork and rebate filing on your behalf, so there’s no fuss or waiting around for rebate checks! Koala Insulation of the Sound Shore was the 2025 Contractor of the Year and won the 2025 Quality Assurance Award from ConEd’s Weather Ready program.

These programs exist specifically to make energy efficiency upgrades accessible. In many cases, rebates cover a substantial portion of the project cost — and the energy savings begin immediately after installation. Best of all, the rebates are deducted directly off of the invoice – we handle all of the processing and paperwork!

We recently completed a comprehensive insulation project in a beautiful 100+ year old home in the Orienta section of Mamaroneck. The homeowners told us that the 3rd floor bedroom is warm for the first time since they bought the home 20 years ago!

About Koala Insulation of the Sound Shore

We are not a national lead-generation website routing your call to an unknown subcontractor. We are a locally owned and operated business serving Mamaroneck and the Sound Shore communities directly — and we do the work ourselves, employing over 35 technicians that also live in our community. My wife Catharine and I take pride in our Company’s work and love hearing from happy customers.

Why Choose Koala Insulation of the Sound Shore:

We are an award-winning contractor with hundreds of satisfied residential customers:

• ConEd Weatherization Contractor of the Year for 2025
• ConEd Weatherization Quality Assurance Award winner for 2025
• 300+ 5-star Google reviews from real customers across our 2 businesses (Koala Insulation of the Sound Shore and Koala Insulation of Northern Westchester)

We invest heavily in training and retaining top-quality employees:

• BPI (Building Performance Institute) Gold Star Contractor
• Multiple BPI Building Analysts on staff to ensure that any project that we scope or perform for you is grounded in sound building science principles
• Continuing training from manufacturers and Koala HQ for all of our technicians (spray foam techs in particular)

We use only the highest-quality materials on the market:

• Huntsman spray foam that is manufactured in the USA and is GreenGuard Gold certified for low VOC content
• Cleanfiber borate-only cellulose
• Nationally branded Rockwool and fiberglass

We carry robust insurance and are licensed in all areas we do business:

• $1M in general liability (with pollution) insurance, $2M umbrella
• Separate commercial general liability policy with labor law coverage to enable us to work on large commercial projects
• Licensed home improvement contractor in Westchester County, Connecticut, NYC and Nassau County

We are accredited contractors in every major rebate program in our region, a testament to our robust QA/QC capabilities. Programs include:

• ConEd Weather Ready
• NYSERDA Comfort Home
• NYSERDA Empower+
• EnergizeCT
• ConEd Multifamily Energy Efficiency
• ConEd Affordable Multifamily Energy Efficiency

We offer free estimates — we come to your home, evaluate what’s needed, and give you a clear, detailed proposal with no pressure.

Joe Fleury
Owner, Koala Insulation of the Sound Shore
Owner, Koala Insulation of Northern Westchester