Air sealing services in Windsor CA - fewer drafts and an attic that still breathes
Cold floors, drafty rooms or a hot upstairs usually mean air is slipping through gaps. We find them, seal them and leave the vents alone.
- Licensed and insured.
- Free quotes on site.
- We reply within 1 business day.
What does air sealing do for a drafty Windsor house?
The short answer: Air sealing services in Windsor, CA close the gaps that let outside air move through your house, so the insulation you already have can hold the heat where you want it. Think of insulation as a sweater and air sealing as the windbreaker over it, because a sweater on its own lets the wind straight through.
Most people call us about cold floors, a drafty bedroom or a hot room over the garage, and the first thing I'll ask is where it feels worst, because that points to where the air is moving. The price depends on how many gaps there are, how easy your attic and crawl space are to get around in and whether old insulation has to come out first. The schedule mostly turns on what we find that needs fixing before sealing, like a roof leak or old wiring. The written estimate after my visit lays out both for your house, and if you're also thinking about attic insulation, we'll plan the two in the right order.
How can you tell your house is leaking air?
Drafts at outlets and trim
You feel cool air at outlets on outside walls, along baseboards or around the attic hatch. That usually means gaps in the walls or ceiling that connect to the attic or the outdoors, and until they're closed your heating and cooling keeps paying for air that leaks right back out.
Upstairs never feels right
The upstairs or the room over the garage runs hot in summer and cold in winter no matter where the thermostat sits. Attic air is often getting down through gaps around can lights and framing, and piling more insulation on top won't fix it until those gaps are sealed.
Dark streaks in attic insulation
Up in the attic you spot dirty, dark patches in the insulation over light fixtures, pipes and the tops of walls. That's dust filtered out of house air as it pushes up through a gap, and every season it keeps carrying warmth and moisture into the attic.
How we handle air sealing services in your house
We find where the air is getting in before we seal anything, because a gap you guess at is a gap you miss. I go through the attic, and the crawl space if you have one, and look at the usual spots like can lights, plumbing and wiring holes, the tops of interior walls and the hatch itself. Before sealing, we check for anything that has to be fixed first, such as old knob and tube wiring still in use, vermiculite insulation, a bath fan blowing into the attic instead of outside, a roof leak or soaked old insulation, since sealing over any of those just hides the problem. Then we close small cracks with caulk and bigger openings with foam, we leave alone the vents that are meant to stay open, and once the house is tighter we'll remind you to have your gas appliances checked so they still vent the way they should.
Air sealing is often the first step of a bigger job. If your lower level feels cold or damp, sealing where the house meets the foundation pairs well with basement insulation. Where ductwork runs through the attic, closed-cell foam insulation, a dense foam that blocks moisture, seals and insulates in one pass.
Seal the gaps, then top up loose fill
This suits most attics where no ductwork runs overhead. We seal the gaps first and then add blown-in insulation, loose fill blown through a hose, and it usually wins on value because foam costs more.
Spray foam where the ducts live
This suits houses with heating and cooling ducts in the attic, where leaky ducts lose a lot of air. Foam costs more, but it seals air while it insulates, so it's usually worth it in that one case.
What happens after you call about air sealing in Windsor?
Here's how a job goes with us, from the first call to the walk-through at the end, so you know who you'll talk to and what you'll have in hand before any work starts.
- Step 01
Call or send a request
Call (707) 687-4455 or use the form, and we'll set up a time for me to come out. Tell me which rooms bother you most so I know where to start looking.
- Step 02
Walk the house with me
I look at the attic, the crawl space and the problem rooms with you, and explain what I find and what has to be fixed first. You then get a written estimate showing where we'd seal, what we'd seal it with and the price, so you know the cost before anyone climbs into the attic.
- Step 03
Our crew seals the house
Our install crew does the work with a lead installer on site, within Windsor's construction hours of 7 a.m. to 7 p.m. on weekdays and 8 a.m. to 7 p.m. on Saturdays, with Sunday work only when the town's Building Official expressly approves it. When we finish, the lead installer shows you what was sealed and cleans up before leaving.
Air sealing services in Windsor and the town's inspection rules
In Windsor, the Town of Windsor Building Division enforces the state building code and the town's own code, and it requires inspections as a project goes along, with the type and number set by the job's scope. The town's rule of thumb is that an inspection is needed anytime something is about to be covered up or made hard to reach, which matters here because insulation often goes right over the gaps we just sealed. Whether your job needs a permit is something we'll talk through at the estimate, and if it does, we take care of the application and set up the inspections.
In attics around Windsor we often find can lights and plumbing holes left open under old insulation that's piled deep in the middle and thin at the edges. We see the same thing on jobs in Santa Rosa and Healdsburg, so we plan for it before we start.
Get a free on-site air sealing estimate
We reply within one business day to set up a time for me to come out, and the estimate is free with no obligation. I'll look at the house with you, explain what I find and what has to be fixed first, and then send you a written estimate.
Why Windsor homeowners call H&M Windsor Spray Foam Insulation
The owner writes your estimate
I come out myself, look at the house with you and write the estimate, and our install crew does the work with a lead installer on site. You hear the plan from the person who made it, and someone who knows that plan is in your attic.
In business since 2017
I taught myself insulation from manufacturer guides and building science books, then learned the rest working attics and crawl spaces around Windsor. We've kept the business small on purpose, so I still have time to explain your house before we touch it.
Licensed and insured for attic work
We're licensed and insured. That matters when a crew is working in your attic around wiring, framing and the back of your ceilings.
On air sealing, doing the work in the right order matters more than anything, and that starts with finding where the air gets in. Call (707) 687-4455 or use our contact page to set up a visit.
Air sealing questions from Windsor homeowners
How do I find air leaks in my house?
The most thorough way is an energy assessment with a blower door test, a large fan that pulls air through the house, and a thermal camera that shows where outside air is getting in. Energy guides suggest booking that assessment first, because it shows both where the leaks are and how well the house is ventilated. If you hire an assessor, ask whether they hold a Building Performance Institute Building Analyst or RESNET rater certification, two nationally recognized credentials, and whether they test both before and after the work.
Is air sealing safe if I have a gas furnace or water heater?
Yes, as long as your gas appliances still vent properly afterward, because a tighter house can let carbon monoxide build up when one doesn't. Plan on having a heating and cooling technician check the furnace, water heater and dryer for proper venting once the work is done. Around the flues themselves, building guidance calls for fire-rated caulk with rated collars or sheet metal, with proper clearance kept from wood and other materials that can burn.
Should every gap in the attic be sealed?
No. Combustion air ducts, which feed air to gas appliances, and the soffit, ridge and gable vents that let the attic breathe are meant to stay open, because they only work with air moving through them. Burying or blocking those vents, especially the ones at the eaves, can trap moisture that later shows up in the framing.
How much does air sealing cost in Windsor?
There's no set price, because air sealing is priced to your house once I've seen the attic and crawl space. A cramped attic with little headroom, gaps spread over many rooms or a switch to spray foam push the cost up, and easy access with old insulation in decent shape keeps it lower. Your written estimate gives you the actual figure before any work starts.
How long does air sealing take, and do we have to leave the house?
Most air sealing is done from the attic and crawl space, so it usually doesn't mean clearing out of the house. How long it takes depends on the size of the house, how easy the attic is to move around in and whether old insulation has to come out first. If your job calls for sprayed foam, I'll tell you at the estimate about re-entry time, meaning when you, the kids and the pets can come back inside.
Should I seal air leaks before adding attic insulation?
Yes, seal first, because insulation laid over open gaps ends up fighting a draft it can't stop. Once new insulation is down, those gaps are buried and much harder to reach, and any soaked or droppings-filled old material should come out before either step so the problem doesn't stay up there.
Related insulation work that pairs with air sealing
Basement insulation
A basement that feels damp or chilly often loses heat at the rim and walls, and insulating it after sealing keeps the lower floors warmer underfoot.
Closed-cell foam insulation
If ducts run through your attic or a wall needs to keep moisture out, dense closed-cell foam stops air and water vapor while it insulates.
Book an air sealing visit in Windsor
Call (707) 687-4455 or send a request, and have a list of your gas-burning appliances and any roof leaks you know about ready, since both shape what we fix and seal first.