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Serving Gilroy, CA and surrounding areas. (669) 345-1323
Gaps in your attic and crawl space let Gilroy summer heat pour in all day long. We find and close every hidden leak so your air conditioner can actually keep up.
Air sealing services in Gilroy close the gaps, cracks, and openings in your attic, crawl space, and walls that let conditioned air escape and outside air rush in - most single-family homes take one to two days to complete. Think of it as weatherstripping your whole house, not just the doors. A contractor uses foam, caulk, and tape to close spots you would never think to look at, like the gap where plumbing pipes enter the wall or where your attic floor meets the framing.
Insulation slows heat from moving through your walls and ceiling. Air sealing stops air from moving through gaps. Both matter, but air sealing should come first. Adding insulation on top of unsealed gaps is like putting a thick blanket over a screen door. Many homeowners pair air sealing with basement insulation or attic work to treat the whole thermal envelope at once.
For attic-specific gaps and penetrations, our attic air sealing service targets the attic floor, top plates, and all the spots where wiring and plumbing poke through - because that is where most of the heat gain happens in Gilroy homes during summer.
If your air conditioner runs all afternoon but your upstairs rooms or back bedrooms still feel stuffy and warm, air leaks are often the reason. Hot attic air is pushing down through gaps in your ceiling, and your AC cannot keep up. This is one of the most common complaints from Gilroy homeowners during July and August.
During wildfire season, if you can smell smoke inside your home or notice a layer of fine dust on surfaces even when everything is shut tight, air is finding its way in through gaps you cannot see. Those gaps are usually in the attic floor or around recessed lights, not around your windows.
If your electricity bill climbs dramatically from May through September and seems higher than what neighbors in similar-sized homes pay, air leakage is a likely contributor. A quick look at your PG&E usage history - available in your online account - can show whether your cooling consumption is unusually high.
If one room is always colder in winter or hotter in summer no matter what you do with the thermostat, that room likely has more air leaks than the rest of the house. Common culprits are rooms above a garage, rooms with recessed ceiling lights, or rooms at the end of a hallway.
We use spray foam, acoustic caulk, and rigid foam board to close gaps throughout your home - starting with the attic floor, where the biggest leaks almost always hide. Most jobs include sealing the band joist along the foundation, recessed light fixtures, plumbing and wiring penetrations, and the attic hatch. Before any work begins, we run a blower door test to map exactly where air is moving so we address the right spots, not just the visible ones. For homes that need attic-focused work, our attic air sealing service targets the specific penetrations and gaps on the attic floor that let heat down into your living space.
Many homeowners combine air sealing with basement insulation or crawl space work to close the building envelope from top to bottom. That combination delivers the most complete result - sealing the air pathways first, then adding insulation to slow the remaining heat transfer.
Closes gaps and penetrations on the attic floor before adding insulation - the highest-impact location in most Gilroy homes.
Seals the rim joist and crawl space entry points to stop cold, damp air from rising into the living space.
The framing above your foundation is one of the leakiest spots in older homes. Foam or rigid board closes it permanently.
A before-and-after depressurization test maps your leaks and verifies that the sealing work actually improved your home.
Gilroy sits in the southern Santa Clara Valley and regularly sees summer temperatures climb into the mid-90s. When your home has air leaks, that hot outdoor air pours in through your attic and crawl space all day, forcing your air conditioner to run constantly just to keep up. Many of Gilroy neighborhoods include homes built in the 1960s through 1990s, when air sealing was not a standard part of construction. Over time, wood framing shrinks, plumbing and electrical work creates new penetrations, and original caulk dries out and cracks. Homes in these neighborhoods almost always have significant air leakage that was never addressed.
Gilroy and the broader South Bay region also experience periods of poor outdoor air quality during wildfire season, typically late summer through fall. Homes with significant air leaks pull smoky outdoor air in through gaps in the attic and crawl space, making it harder to keep indoor air clean even with windows closed. Air sealing reduces those uncontrolled pathways. Homeowners we work with in Campbell and Los Gatos describe the same pattern. The Building Performance Institute recommends a blower door test as the standard way to find leaks before any sealing work begins, and it is the first step we take on every job.
When you reach out, we will ask about your home age, square footage, and what has been prompting your concern - high bills, hot rooms, or drafts. This helps us estimate how long the job will take. We respond within 1 business day. Most Gilroy homeowners can get an initial visit scheduled within a week or two.
A trained technician walks through your home and sets up a blower door test - a temporary fan in your front doorway that shows exactly where air is leaking. This assessment usually takes one to two hours and gives you a clear picture of your home condition before any work is agreed to.
The crew works primarily in your attic and crawl space, applying foam and caulk to every gap and penetration identified during the assessment. Most single-family homes in Gilroy take one full day. Your living areas stay largely undisturbed throughout the process.
Once the sealing is done, we run a second blower door test to measure the improvement and show you the before-and-after numbers. If the work qualifies for a PG&E rebate or state incentive, we provide the documentation you need to submit your claim.
We run a before-and-after blower door test on every job so you have proof the work made a difference. No guesswork, no pressure.
(669) 345-1323Every job includes a depressurization test before we start and again after we finish. You see the actual improvement in numbers, not just a contractor telling you the work is done. That result is also your documentation for any PG&E rebate claim.
We work across Gilroy, Morgan Hill, Los Gatos, Campbell, Santa Cruz, and beyond. That breadth means we have seen the same housing patterns across the region and know exactly what to expect in homes of every era and style.
We know that Gilroy homeowners worry about smoke intrusion in late summer and fall. Our sealing approach specifically targets the attic floor and crawl space gaps that pull smoky outdoor air into living spaces - even when every window is closed.
PG&E offers rebates for qualifying air sealing work, and California Energy Upgrade programs may stack on top. We know what documentation you need and which installation methods currently qualify, so you do not leave money on the table.
Every job comes with written documentation of what was found, what was sealed, and the measured improvement - so you have proof for rebate applications and peace of mind that the work was done right.
Insulate your basement ceiling or walls to reduce heat loss and moisture problems below your living space.
Learn moreTarget the attic floor penetrations and top plates that account for most air leaks in Gilroy homes.
Learn moreMost jobs take one day and show measurable results by the first summer. Call today to schedule your free blower door assessment and written estimate.