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Serving Key West, FL and surrounding areas. (645) 300-7168
Key West Insulation is an insulation contractor serving Marathon, FL, specializing in home insulation, spray foam, attic insulation, and vapor barrier services for the concrete block homes, piling structures, and canal-front properties throughout this mid-Keys city. We have served Monroe County homeowners since 2017 and respond to every new inquiry within one business day.
Marathon homes face salt air, tidal moisture, and tropical heat on every side, and the insulation that protects them needs to be chosen and installed with those conditions in mind. Our home insulation services cover the full scope - attics, walls, underfloor assemblies, and crawl spaces - so every part of the building envelope is addressed in a single project rather than piece by piece over time.
Marathon's concrete block construction is durable against wind but offers almost no thermal resistance on its own. Closed-cell spray foam bonds directly to CBS block, stops moisture from wicking through the wall, and delivers a high R-value in a layer thin enough to fit inside existing wall cavities without requiring major interior renovation.
Marathon has no natural shade from mountain terrain or inland tree cover, and the sun beats directly on metal and concrete tile roofs from well above 85 degrees for most of the year. Attic insulation - blown-in cellulose or fiberglass, or spray foam at the roof deck - keeps that stored heat out of living areas and reduces how hard air conditioning has to work every afternoon.
Canal-front homes in Marathon sit directly above tidal and groundwater, and moisture rises through the structure continuously. A properly installed vapor barrier in the underfloor or crawl space area blocks that upward moisture movement before it reaches wood joists, subfloor material, and the living space above - protecting against rot and elevated indoor humidity that drives mold growth in the walls.
Elevated homes throughout Marathon have an open underfloor space that channels salt air and humidity directly into the bottom of the building assembly. Insulating the underside of the floor with closed-cell spray foam or rigid foam board cuts off that heat and moisture pathway and makes ground-level rooms noticeably more comfortable during the summer months when outdoor conditions are most demanding.
Marathon has a significant share of older homes built before Florida adopted stricter energy codes, and many have little or no wall insulation in their finished cavities. Retrofit methods - injection foam, dense-pack blown-in, and low-pressure spray foam - let us add meaningful thermal resistance to an occupied CBS or wood-frame home without tearing out interior finishes or requiring the homeowner to vacate.
Marathon is a small city of roughly 8,000 people situated on Vaca Key and several surrounding islands in the middle of the Florida Keys - roughly halfway between Key West and the mainland. It is one of the few incorporated cities in Monroe County, with its own building department under the City of Marathon. The city has Atlantic Ocean on its south side and Florida Bay on its north, which means salt air surrounds every home from every direction with no inland buffer. Concrete block is the dominant construction material - CBS homes are more wind-resistant than wood frame, but the blocks themselves have an R-value near zero, making wall insulation far more important here than in most of Florida.
Hurricane Irma made near-direct landfall in the Florida Keys in September 2017 and caused heavy damage throughout Marathon. Many homes were rebuilt or substantially repaired, often to Florida's current high-wind building code with impact-resistant windows and reinforced roof connections. But insulation was not always part of those post-storm repair scopes. Homes that survived Irma without being fully rebuilt may still have original fiberglass batts that have absorbed moisture over decades and lost the R-value they were rated for. Median home values in Marathon consistently exceed $700,000, and the conditions here - constant salt air, persistent humidity above 80 percent, and storm season from June through November - make insulation one of the most practical investments a homeowner can make.
Our crew works throughout Marathon regularly, and we understand the local conditions that affect insulation work here. Permits in Marathon are issued by the City of Marathon Building Department, separate from Monroe County, and we handle the permit application and inspection coordination on every permitted project so Marathon homeowners do not have to manage that process themselves. Working with CBS construction is a routine part of every job we do in this city - wall access, foam adhesion to block, and thermal bridging at the bond beam are things we address on nearly every Marathon home.
Most of Marathon's residential neighborhoods run along and off the Overseas Highway, with the city center near the intersection with 33rd Street. The canal-grid neighborhoods south of US-1 are among the most moisture-intensive properties we work on - homes there sit directly over tidal water with salt air moving through the underfloor space on every tide cycle. The area near Sombrero Beach on the Atlantic side is one of the most exposed stretches of coastline in the Keys, and homes within a few blocks of the beach see some of the heaviest salt deposition on any exterior surface.
We serve the full length of this stretch of the Keys. Heading southwest on US-1 from Marathon, we regularly work in Big Pine Key, and heading northeast toward the mainland puts us in range of the Upper Keys communities as well. If you are comparing options for your Marathon home, we are already in your area on a regular basis.
Call us or submit a request online and describe your situation. We respond to every Marathon inquiry within one business day and can often schedule an assessment within the same week.
We come to your Marathon property and assess the attic, wall construction, underfloor space, and any areas of concern. We give you a written estimate with a clear cost breakdown before any work is agreed to - no vague ranges, no surprises at invoice.
We pull all required City of Marathon permits before work begins and complete installation - typically in one day. Homeowners do not need to be present during the work itself, and we communicate progress throughout the day for seasonal or out-of-town owners.
After installation we walk through the completed work together, confirm permit inspections are signed off, and answer any follow-up questions. If anything is not right, we address it before we leave.
We serve homeowners throughout Marathon and the surrounding Keys. Submit a request today and we will respond within one business day with next steps.
(645) 300-7168Marathon is the largest city in Monroe County outside of Key West, with a population of roughly 8,000 to 9,000 people spread across Vaca Key and several adjacent small islands. It has a working character that sets it apart from purely tourist-oriented Keys communities - marinas, commercial fishing operations, dive shops, and boat yards are part of the everyday fabric of the city alongside the residential neighborhoods, restaurants, and small businesses that line US-1. The city is home to the Turtle Hospital, a sea turtle rescue and rehabilitation facility that has operated since 1986 and is one of the most recognized institutions in the Keys. Sombrero Beach on the Atlantic side is the main public beach and a gathering spot for full-time residents and visitors alike.
Residential neighborhoods in Marathon are a mix of concrete block homes from the 1960s through 1980s and newer piling construction built or rebuilt to post-Irma wind codes. A large share of the residential lots are canal-front, with boat docks and direct water access - a characteristic that makes Marathon attractive to homeowners but that also means elevated moisture exposure for every property near a canal. The Seven Mile Bridge - one of the longest bridges in the world - connects Marathon to the Lower Keys at its southwest end, making Big Pine Key the closest neighbor in that direction. To the northeast along US-1, Key West is the regional center for services and government, about 50 miles away.
High-density foam providing superior insulation and moisture resistance.
Learn MorePrevents moisture damage and mold growth throughout your structure.
Learn MoreCall us or submit a request today. We cover Marathon and the full length of the Keys corridor and respond within one business day.