Seal the hidden gaps around plumbing, wiring, recessed lights, and ductwork in your attic floor — the single largest source of air leakage in most Denver homes. Serving Denver, Aurora, Lakewood, Arvada, Westminster, Thornton, Centennial, Boulder, Littleton, Broomfield, Castle Rock, Parker, Golden, Englewood, and the surrounding Denver metro area within 100 miles.
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Seals the #1 source of air leakage in most Denver homes
Addresses plumbing vents, wiring gaps, recessed lights, ductwork chases
Required before insulation upgrades for Denver energy code compliance
Maximizes the performance of new attic insulation
Xcel Energy recommends attic bypass sealing as a priority measure
Significantly reduces heating costs during Denver winters
A proven, methodical approach refined over 20+ years of professional installation.
We access the attic, move or remove insulation as needed, and systematically locate every air bypass — plumbing, wiring, recessed lights, ductwork, top plates, and more.
Each bypass type requires specific materials: fire-rated foam for chimneys, high-temp caulk for recessed lights, rigid foam for large chases, spray foam for irregular gaps.
Every identified bypass is sealed with the appropriate material, starting with the largest leaks for maximum impact. We work methodically across the entire attic floor.
Displaced insulation is repositioned or new insulation is installed over the sealed bypasses. We verify the work is complete and the attic is ready for any additional insulation.
Your attic floor is riddled with hidden openings that allow heated air to escape directly from your living space into the unconditioned attic. These "attic bypasses" include gaps around plumbing vent stacks, electrical wiring penetrations, recessed light housings, HVAC duct chases, chimney chases, and unsealed top plates where interior walls meet the attic floor. Together, these bypasses can leak more air than a wide-open window — yet they're hidden beneath insulation where you can't see them. Sky Insulation specializes in attic air sealing and bypass sealing for Denver homeowners. Our crew systematically locates and seals every significant bypass in your attic floor using the appropriate materials — high-temperature caulk, fire-rated spray foam, rigid foam board, sheet metal, and weatherstripping. This targeted work is the single most effective step you can take before adding new attic insulation. Denver's energy code requires attic air sealing as part of any insulation upgrade, and Xcel Energy specifically recommends bypass sealing as a priority measure in their Whole Home Efficiency program. When combined with an attic insulation upgrade, air sealing maximizes your energy savings and ensures your new insulation performs at its full rated R-value.
Attic bypasses are the single largest source of air leakage. Sealing them delivers the most dramatic improvement in energy efficiency for your Denver home.
Sealed bypasses stop warm air from escaping through the ceiling, eliminating the cold spots and uncomfortable rooms common in Denver homes during winter.
Air sealing before insulating ensures your insulation works at peak efficiency — without sealed bypasses, air simply flows through and around insulation.
We address each bypass type with the correct material and technique — recessed lights, plumbing vents, wiring, ductwork, and top plates each require specific solutions.
Attic bypasses are gaps and openings in your attic floor that allow air to flow freely between your living space and the unconditioned attic. Common bypasses include gaps around plumbing vent stacks, electrical wiring, recessed light housings, HVAC ductwork, and unsealed top plates of interior walls.
Insulation slows heat transfer by conduction, but it cannot stop air movement. If bypasses are left unsealed, warm air flows right through insulation via convection. Sealing first, then insulating, gives you both benefits — reduced air leakage and reduced heat conduction.
Yes. We can move or temporarily remove existing insulation to access and seal the bypasses beneath it, then replace or add insulation afterward. For the best results, we recommend combining air sealing with an insulation upgrade.
Attic air sealing alone can reduce heating and cooling costs by 10–20%. When combined with an insulation upgrade to current R-value standards, total savings of 25–35% are typical for Denver homes.
Serving Denver, Aurora, Lakewood, Arvada, Westminster, Thornton, Centennial, Boulder, Littleton, Broomfield, Castle Rock, Parker, Golden, Englewood, and the surrounding Denver metro area within 100 miles.
Based in Denver, CO, we provide professional insulation, fireproofing, and waterproofing services to homeowners and businesses within a 100-mile radius.
+ Surrounding communities within the Denver Metro Area
