Serving Tallahassee, FL and surrounding areas(850) 518-3745
Insulation slows heat transfer. Air sealing stops the humid outdoor air that makes your AC run all day. In Tallahassee's Climate Zone 2, most homes leak far more than they should — and a blower door test shows exactly where.
Air sealing in Tallahassee closes the unintended gaps in your home's envelope — attic top plates, recessed light cans, plumbing penetrations, partition wall bypasses — stopping the bulk movement of hot, humid outdoor air into your conditioned space. Most single-family homes complete in one day with a documented ACH50 result before and after.
Insulation and air sealing solve different problems. Insulation slows conductive heat transfer through solid materials. Air sealing stops air from moving through gaps entirely. In Tallahassee, where outdoor humidity regularly exceeds 80% during a cooling season that stretches eight months or more, every cubic foot of air that infiltrates through an unsealed attic ceiling carries moisture your AC has to remove. That latent load forces longer run times, higher electricity bills, and more wear on the equipment — and it does not go away by adding more insulation over a leaky ceiling plane.
Most Tallahassee homes are slab-on-grade, which means the attic ceiling is the dominant air sealing boundary. For homes where the whole envelope needs attention, air sealing is most effective when paired with a full home insulation upgrade. For attic-specific work — the highest-priority location in most homes here — see our dedicated attic air sealing service, which focuses on the ceiling plane bypasses that drive the majority of infiltration in Leon County homes.
If your air conditioner never seems to catch up on summer afternoons, the problem is often moisture load rather than cooling capacity. Every gap in your attic ceiling plane lets humid Tallahassee air flood into the conditioned space, forcing your AC to remove that moisture before it can cool the room. The equipment looks undersized, but the envelope is the real issue.
Dark lines or streaks on blown-in attic insulation are a reliable sign that air is moving through the insulation layer rather than around it. Airborne dust follows the infiltration path and deposits on the fibers. That pattern almost always points to unsealed top plates or recessed light penetrations that need spray foam or rigid foam blocking.
Tallahassee homes built before 1980 routinely test at 15 to 20 air changes per hour at 50 Pascals, far above the current code maximum of 7 ACH50. At those leakage rates, the conditioned air your HVAC produces is essentially being exchanged with hot, humid outdoor air throughout the day. The energy penalty shows up directly on your monthly FPL or Talquin bill.
Feeling a draft near electrical outlets on exterior walls or along the top of interior walls typically means air is tracking through the building envelope and down through partition wall cavities. These bypasses are common in pre-1980 construction and are among the most cost-effective locations to seal because a small amount of low-expansion spray foam closes large air pathways.
Every air sealing project starts with a blower door test. A calibrated fan mounts in an exterior doorframe, the home is depressurized to 50 Pascals below outdoor pressure, and a technician uses a thermal imaging camera and smoke pencils to map exactly where air is moving through the envelope. That diagnostic step — the test-in — is the difference between guessing and knowing. Without it, sealing work is applied based on visual inspection alone, which misses the bypasses inside wall cavities and above ceiling drywall that account for most of a home's infiltration.
For Tallahassee's slab-on-grade homes, the ceiling plane is almost always the highest-priority sealing location. Top plates — where interior and exterior walls meet the ceiling drywall — are the most common major bypass. Interior partition walls that don't terminate against the roof deck create open channels from the living space into the attic. Recessed light fixtures are another consistent source. We close these with two-part low-expansion spray foam and rigid foam blocking, then move to smaller gaps at plumbing stacks, electrical boxes, and HVAC penetrations. Attic air sealing can be performed as a standalone service or combined with insulation work in the same visit.
After sealing, we conduct combustion appliance zone testing to confirm that gas water heaters and furnaces still vent properly — tightening an envelope without this step can create backdrafting conditions. The project closes with a test-out blower door measurement that documents the ACH50 reduction and satisfies the Florida Building Code Section R402.4 verification requirement for permitted work. Home insulation combined with air sealing in the same project produces compounding efficiency gains — the air barrier keeps conditioned air in, and the insulation slows heat transfer through the now-sealed assembly.
The ENERGY STAR Air Sealing Guide for Contractors is the primary reference document for test-in, sealing, and test-out protocol, and the U.S. Department of Energy's air sealing guide provides homeowner-level explanations of where leaks occur and what materials address them.
Baseline ACH50 measurement that locates leaks with thermal imaging before any sealing work begins.
The highest-priority location in most Tallahassee slab-on-grade homes — top plates, recessed lights, and partition bypasses.
A second blower door measurement that documents ACH50 reduction and satisfies Florida Building Code compliance.
Tallahassee sits in IECC Climate Zone 2 — hot, humid, and unlike the rest of Florida, with meaningful winter heating demand as well. Annual average relative humidity hovers around 75%, and summer afternoons push it well past 80%. The Florida Building Code sets a maximum of 7 ACH50 for new construction in this zone. Most homes built here before 1980 test significantly above that, often in the 15 to 20 ACH50 range.
The neighborhoods surrounding Florida State University, Florida A&M University, Frenchtown, and Midtown contain a high concentration of pre-1980 wood-frame homes that were built without air barriers, without foam-sealed top plates, and with minimal attention to attic penetrations. Many of these homes have also been modified repeatedly over the decades — walls opened, plumbing rerouted, electrical updated — without re-sealing the building envelope after each change.
Tallahassee's slab-on-grade construction pattern concentrates the leakage problem at the attic ceiling plane rather than spreading it across multiple envelope boundaries as pier-and-beam homes do. That focused opportunity makes a well-executed attic air sealing project in this market more impactful per dollar than in many other regions.
We serve air sealing customers across Tallahassee and the surrounding communities, including Crawfordville, Midway, and Monticello. Each of these areas has its own mix of housing ages and construction types, and the diagnostic-first approach adjusts the sealing scope to what the specific home actually needs.
We respond within 1 business day to confirm availability and gather basic information about your home's age, construction type, and the symptoms you have noticed. No appointment is needed to get the process started.
A technician mounts a calibrated fan in an exterior doorframe, depressurizes the home to 50 Pascals, and records your baseline ACH50. Thermal imaging and smoke pencils pinpoint the specific leak locations. You receive a written scope of work and estimate before any sealing begins. There is no obligation after the diagnostic.
We seal attic bypasses at top plates and penetrations with two-part spray foam and rigid foam blocking, caulk narrow cracks at framing joints, and address rim joists and attic hatches. Combustion appliance zone testing confirms that gas appliances vent safely after sealing.
A second blower door test confirms the leakage reduction achieved. You receive a written record of pre- and post-job ACH50 numbers, which documents the work for insurance purposes and satisfies Florida Building Code compliance verification for permitted projects.
We test first and propose second — you get a documented ACH50 baseline and a written scope of work before any sealing begins.
(850) 518-3745We measure leakage before and after every air sealing project, not just at the end. That gives you a documented ACH50 number — not a contractor's word — showing exactly how much infiltration was reduced. It also satisfies the Florida Building Code verification requirement for permitted work.
Tightening a home's envelope without checking combustion appliances can cause gas furnaces and water heaters to backdraft. We conduct combustion appliance zone testing at every air sealing project, so efficiency gains don't come with an invisible safety risk.
Most Tallahassee homes are slab-on-grade, making the attic ceiling plane the single most critical boundary for sealing. We have addressed the specific bypass patterns common in this housing stock — open top plates, recessed cans, interior partition gaps — across dozens of Leon County homes since 2022.
The Capital Area Community Action Agency administers the DOE Weatherization Assistance Program for Leon County, using blower door diagnostics and test-out verification as their baseline standard. We follow the same test-in, remediation, test-out protocol, placing our work at the same quality level as the program that income-qualified homeowners receive at no cost.
The Building Performance Institute sets the technical standard for residential air sealing work, including the combustion safety and diagnostic protocols that separate a thorough job from a caulk-and-foam pass. We apply those same standards on every project, because an air sealing job that creates a safety hazard or fails a blower door test-out is not a completed job. The combination of documented results and combustion safety verification is what makes the work defensible to insurance carriers, building inspectors, and future buyers.
Focused sealing of top plates, recessed lights, and attic penetrations — the highest-priority leak locations in most Tallahassee slab-on-grade homes.
Learn moreWhole-envelope insulation upgrades that work alongside air sealing to address both conductive heat gain and infiltration in a single project.
Learn moreSpring is the best window for air sealing in Tallahassee — attics are still workable and you capture the full summer's savings before the hottest months hit.
