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Insulation slows heat - air sealing stops it from bypassing the insulation entirely. We find and close the gaps that send your conditioned air straight outside.
Air sealing services in Downey identify and close the gaps, cracks, and penetrations in your home's building envelope where conditioned air escapes and hot outdoor air enters. Most jobs are completed in one day and are often done alongside insulation upgrades for maximum benefit.
A lot of homeowners assume that adding insulation alone will solve their comfort and energy problems. Insulation slows heat transfer, but it cannot stop air from moving through physical gaps - around recessed lights, along top plates, through plumbing penetrations, and at the perimeter of the building. If your home has those gaps, your conditioned air is escaping through them regardless of how much insulation is in place. Air sealing closes those pathways so the insulation can actually do its job.
Air sealing works hand in hand with attic air sealing - which targets the ceiling plane specifically - and with basement insulation for homes that need coverage at both the top and the bottom of the thermal envelope.
If your thermostat says one thing but certain rooms feel noticeably warmer, air leakage is a likely culprit. Hot outdoor air is entering through gaps faster than your AC can overcome it. In Downey's long summers, this problem runs from June through September - and your electricity bill reflects every day the system works overtime.
Outlets and light switches on exterior walls, recessed ceiling lights, and pull-down attic stairs are common air leakage points. Hold your hand near any of these on a warm day. If you feel warm air moving through, that is conditioned air leaving your home - or hot air coming in - through an unsealed gap. These are exactly the spots we target during air sealing work.
If you already have insulation but your energy bills remain high, air leakage is often the missing piece. Insulation slows conductive heat transfer, but it cannot block air from moving through physical gaps around penetrations and framing. Adding air sealing to existing insulation frequently delivers a more noticeable improvement than adding more insulation alone.
Dark streaks or discoloration around recessed lights, ceiling fans, or light fixtures indicate air movement - dusty attic air is being pushed through gaps around the fixture and depositing on your ceiling. Beyond being an aesthetic problem, this represents real air leakage between your living space and the unconditioned attic above.
We approach air sealing as a whole-building process rather than spot treatments. The most impactful area in most Downey homes is the ceiling plane - the boundary between the living space and the attic. Recessed lights, plumbing and electrical penetrations, top plates, and attic access hatches are all leakage paths. We seal these systematically with foam and mastic before addressing insulation, so the thermal barrier and the air barrier work together. For a focused attic-only project, see our attic air sealing service.
Beyond the attic, we address the building perimeter - rim joists, band boards, the gap between the foundation and the first floor framing, and any penetrations through the exterior walls. For crawl space homes, we also look at the crawl space perimeter and coordinate with any vapor barrier or basement insulation work. Most air sealing projects are done in combination with insulation upgrades for the best result in a single mobilization.
Seals the boundary between your living space and the attic - the highest-impact location in most Downey homes.
Closes the gap between the foundation and first-floor framing where air moves freely in many older homes.
Targets recessed lights, plumbing runs, electrical conduits, and HVAC penetrations throughout the building envelope.
For homeowners doing both in one project - air sealing is completed first, then insulation is added above or around it.
In Downey's climate, air conditioning runs from late spring through early fall - and for older homes, a significant portion of that cooled air exits through uncontrolled gaps before it ever reaches your comfort level. The U.S. Department of Energy notes that air sealing combined with insulation can cut heating and cooling costs substantially - and the savings are felt most in climates like Southern California's, where cooling loads are high for many months of the year. For homes near industrial areas or busy roads, a tighter envelope also means less outdoor dust and particulates finding their way inside through leaks in the building shell.
We serve Downey and the surrounding area regularly, and we see the same air leakage patterns in homes throughout the region. Homeowners in Compton and Lynwood deal with the same postwar construction and the same unsealed penetrations at the ceiling plane. The homes look different on the outside, but the air leakage problems are consistent - and so is the improvement that comes from addressing them properly.
Describe what you are experiencing - which rooms, when it happens, and whether you have any existing insulation. We respond within 1 business day and come to the assessment prepared.
We inspect the attic, building perimeter, and any problem areas you have identified. We explain what we find in plain terms and give you a written quote covering the scope of work and what you will notice after.
The crew works systematically through the identified leakage points using foam, mastic, and other appropriate sealants. If insulation work is being done at the same time, air sealing comes first.
We walk you through what was sealed and provide documentation of the completed work. If you want a blower door test to verify the improvement, we can arrange that as part of the project.
We do a free on-site assessment, show you exactly what we find, and give you a written quote with no obligation.
Sealing one visible gap while leaving a dozen others open delivers minimal improvement. We work through the building envelope systematically - attic ceiling plane first, then perimeter and penetrations - so you get a meaningful result rather than a partial one.
Homes built in Downey between the 1940s and 1970s share consistent air leakage patterns - unsealed top plates, uninsulated attic hatches, and penetrations that were never sealed at the time of construction. We have worked on enough of these homes to know where to look and what materials work best in each location.
Scheduling two separate contractors for air sealing and insulation means two mobilizations, two disruptions, and often a gap between the two jobs where the work is incomplete. We handle both, coordinating the sequence correctly so the air barrier is in place before insulation is added on top of it.
The Building Performance Institute sets standards for whole-home energy performance work, including air sealing. Following these standards means we approach your home as a connected system - not a series of isolated problems - which produces better outcomes and protects indoor air quality.
Downey Insulation brings a whole-building approach to air sealing in Downey - finding all the leakage points, not just the obvious ones, and coordinating with insulation work so the job is done right in a single visit. That is the difference between a complete solution and a partial one.
Focused air sealing at the ceiling plane - the single highest-impact location for reducing air leakage in most Downey homes.
Learn MoreInsulation and air sealing for the lower envelope of the home, addressing the perimeter where foundation meets framing.
Learn MoreEvery day without air sealing is another day your AC fights gaps in your building envelope. Call Downey Insulation for a free on-site assessment in Downey today.