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Serving Gilroy, CA and surrounding areas. (669) 345-1323
Hidden gaps in your attic floor let summer heat and wildfire smoke push into your home all day. We find and close every opening so your cooling system can finally keep up.
Attic air sealing in Gilroy means finding and plugging every gap, crack, and opening in your attic floor that lets conditioned air escape and outside air sneak in - most single-family homes are completed in two to six hours, with no disruption to your living spaces. A technician works in the attic using foam and caulk to close spots around recessed light fixtures, plumbing pipes, wiring penetrations, and the tops of interior walls - all the places you cannot see from below but where air moves freely between your living space and the attic. That work is distinct from adding insulation, and it needs to happen first.
Insulation slows heat transfer through solid surfaces. Air sealing stops air from flowing through holes. Both matter, but sealing first is what makes the insulation work as intended. Many Gilroy homeowners combine attic air sealing with crawl space vapor barrier work to close the building envelope from both ends - attic above and crawl space below.
For homes that also need new or upgraded insulation added on top of the sealed attic floor, our full air sealing services package covers both steps in sequence - sealing first, then insulating - so the finished result performs the way it should.
If the second floor or rooms directly below the attic stay noticeably warmer than the rest of the house during Gilroy summer heat, hot attic air is pushing through gaps in the ceiling. Your air conditioner is fighting a battle it cannot win if the attic floor is not sealed. This is one of the most common complaints from homeowners in Gilroy older neighborhoods, and it is almost always fixable.
If your PG&E bill climbs much higher than it did a few years ago, and your habits have not changed, air leakage is a likely culprit. A leaky attic forces your cooling system to work harder and longer to hold the same temperature. If your bills feel out of proportion to how much you actually use your AC, it is worth having someone assess the attic.
If you can smell wildfire smoke inside your home when air quality is poor outside - even with windows and doors closed - air is finding its way in through gaps, and the attic is the most common entry point. Gilroy and the surrounding hills experience significant smoke events most years. This is a sign worth taking seriously.
Stand in a room and look up at recessed light fixtures or the pull-down attic stair. If you can see daylight, feel a draft, or notice discoloration around the fixture, those are direct connections between your living space and the attic. They are among the most common and highest-impact air leaks in any home, and they are straightforward to close.
Every attic air sealing job starts with a blower door test - a large fan placed in your front doorway that measures exactly how much air is leaking out of your home and where the biggest leaks are. That diagnostic gives us a map of the problem before anyone picks up a caulk gun, and we run it again after the work is complete so you have before-and-after numbers rather than just a contractor saying the job went well. The sealing itself covers all attic floor penetrations: plumbing and wiring entry points, recessed light housings, the tops of interior walls, drop soffits, and the attic hatch itself. For homes where a complete building envelope upgrade is the goal, our crawl space vapor barrier service addresses the other end of the home - the crawl space below - so conditioned air is not escaping from the floor either.
If your attic also needs new or topped-up insulation after the sealing is done, our full air sealing services package handles both steps in the correct order. Adding insulation over an unsealed attic floor wastes material and budget - the sealing has to come first.
Measures your home air leakage before and after work so you have verifiable proof of improvement.
Closes all plumbing, wiring, and structural openings on the attic floor - the primary path for heat and smoke entry.
Addresses one of the most impactful and commonly missed leak locations in older Gilroy homes.
Seals the pull-down stair or hatch frame that is often left completely open to the attic in older homes.
Gilroy sits in the southern Santa Clara Valley and regularly sees summer highs above 95 degrees. When your attic floor has gaps in it, that hot attic air - which can reach 150 degrees or more in summer - pushes straight down into your living spaces all afternoon. Many of Gilroy established neighborhoods, including areas around the historic downtown and older subdivisions off Monterey Road, include homes built in the 1960s through 1980s before California required attention to air sealing. Those homes were built with little thought given to the attic floor, which means gaps that have never been addressed. If your home is more than 30 years old and has never had this work done, there is a very good chance the attic floor is full of openings.
Gilroy and the greater Santa Clara Valley also experience significant wildfire smoke events most summers and falls. A leaky attic is one of the primary ways smoky outdoor air gets pulled into your home when windows and doors are closed. For families with children, elderly members, or anyone managing respiratory conditions, that pathway matters. Homeowners we work with in Campbell and Los Gatos describe the same experience - noticeable improvement in indoor air quality during smoke events after the attic was sealed. The Energy Upgrade California program connects homeowners with qualified contractors and available rebates for this type of work.
When you call or submit a request, we ask about your home age, comfort issues, and whether you have noticed any changes in your energy bills. This helps us come prepared. We respond within 1 business day and can usually schedule an initial visit within a week or two.
Before any work begins, we run a blower door test that measures exactly how much air is escaping your home and where the biggest leaks are. This takes about an hour and gives you a clear picture of the problem - not a guess.
The technician works entirely in the attic, pulling back existing insulation to expose the floor and sealing every gap they find. Your living spaces are not disturbed. Most standard homes are finished in two to six hours.
Once sealing is complete, we restore any moved insulation and run the blower door test again. You receive before-and-after numbers and a written summary of what was sealed - documentation you can use for your PG&E rebate application.
We test your home before and after the work - you get verifiable results, not just a contractor's word.
(669) 345-1323We run a before-and-after blower door test on every attic air sealing job - not just on request. That test gives you real numbers showing how much your home leakage improved, so you know what you paid for rather than taking anyone's word for it.
We have sealed attics in Gilroy and across 11 surrounding service areas, including older homes near downtown and newer subdivisions. That experience means we have encountered the full range of attic configurations and construction eras common in this part of Santa Clara County.
PG&E serves Gilroy and offers rebates for qualifying energy upgrades. We document every job in a format that satisfies rebate requirements so you can submit the paperwork without having to chase down additional records after the fact.
Our California C-2 Insulation and Acoustical license is verifiable through the CSLB website. We carry workers compensation and liability insurance - protecting you, your home, and anyone on the crew for the duration of the job.
Verified testing, documented rebate paperwork, and local experience across the South Bay set the standard we hold every job to. The Building Performance Institute recommends blower door testing as the baseline for any air sealing project - it is the step that separates verifiable work from a job you simply hope was done correctly.
Closes the lower end of your building envelope - stopping moisture and cold air from rising through the crawl space into your living areas.
Learn moreA whole-home approach that covers the attic, crawl space, and band joist - then adds insulation on top in the correct sequence.
Learn moreSpring is the best window to get this done - before the busiest season begins. Call today for a free estimate and blower door assessment.