Air sealing is the step most Fort Myers homeowners skip — and it's the one that determines whether insulation actually performs. Insulation slows heat transfer, but if air leaks around recessed lights, plumbing stacks, chimney chases, and attic hatches are letting conditioned air escape, the insulation can't do its job. InsulX air-seals every Lee County attic before blowing in insulation, because sealed + insulated is dramatically more effective than insulated alone.
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The most common air leaks in Fort Myers attics are around recessed can lights (the biggest single source), plumbing stacks, chimney chases, attic hatches and pull-down stairs, wiring penetrations, and bathroom exhaust fan housings. Each gap is small, but collectively they can equal the air loss of an open window.
In summer, these leaks let hot, humid attic air infiltrate the living space, forcing the AC to work harder. Sealing these gaps before insulating is essential for Fort Myers homes.
Before blowing in insulation, our Fort Myers crews inspect every penetration in the attic floor. Recessed lights get fire-rated covers or are sealed with high-temperature caulk. Plumbing stacks and wiring penetrations are sealed with expanding foam. Attic hatches get weatherstripping and an insulated cover. Chimney chases are flashed and sealed with fire-rated materials.
This process adds 1–2 hours to a typical Lee County install, but it's the difference between insulation that performs at 100% and insulation that performs at 60%. Every Fort Myers install from InsulX includes air sealing as a standard step.
Studies show that air-sealing an attic before insulating can improve overall energy performance by 20–30% compared to insulation alone. In Fort Myers homes, this means a 20–30% greater reduction in cooling bills — for a few hours of additional labor. That's why we never insulate without sealing first.
Air sealing also improves comfort by eliminating cold drafts in shoulder seasons and reducing humidity infiltration in summer. Many Fort Myers homeowners report that their home feels more comfortable at a higher thermostat setting after air sealing — which is where the real savings live.
Air sealing closes the gaps around lights, plumbing, chimneys, and attic hatches that let conditioned air escape. Without sealing, insulation can't perform at its rated R-value. Every Fort Myers install from InsulX includes air sealing as a standard step.
Air sealing is included with every InsulX blown-in insulation install in Fort Myers — there's no separate charge. Standalone air sealing projects typically run $500–$1,500 depending on attic size and the number of penetrations.
While some gaps are DIY-friendly, professional air sealing covers every penetration — including fire-rated sealing around chimneys and recessed lights — with materials that last. Incomplete sealing leaves the biggest leaks open, so the DIY savings are often minimal compared to a professional Fort Myers install.
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