Retrofit insulation in Brentwood CA - an existing house that stops feeling drafty
If upstairs runs hot or the rooms feel drafty, we seal the gaps first and then add insulation so your house holds its temperature.
I come out and price it myself
I come out to the estimate myself and go up into the attic to look at the old layer and the gaps before I price anything. I'd rather tell you a job isn't ready yet than do it twice.
Licensed and insured, and easy to check
We're licensed and insured. California's Contractors State License Board has its own classification for insulation work, so it's fair to ask any contractor which license they hold before they set foot in your attic.
Five years of sealing before insulating
I started this business in Brentwood in 2021, after learning the trade on an insulation crew. We're known for doing attic work in order, sealing first and insulating after. Call (925) 503-1068 and I'll come take a look.
Retrofit insulation for Brentwood homes
Retrofit insulation adds insulation to the attic or outside walls of a house that's already built, and paired with air sealing, it saves energy and cuts fuel bills. At Advanced Brentwood Insulation Company, we do it for Brentwood homes with a hot upstairs, drafty rooms or a climbing power bill.
Three things move the price most. One is how many inches are already up there and whether that old layer can stay, the next is how much sealing the attic needs first, and the last is whether your walls are part of it. The schedule turns on the same things, plus anything we find that has to be fixed before we insulate, like old wiring or a damp spot. Your written estimate lists the prep along with the insulation.
Attic work in Brentwood can fall under California's energy code. The state's guidance says its attic insulation and air sealing rules for vented attics apply when the ceiling is altered, and adding insulation or replacing the old layer may count, so we treat sealing as part of the job. We're based in Brentwood and work in many of the cities around it, from Antioch and Oakley out to Livermore and Tracy. If yours isn't named on the site, ask us.
How we handle retrofit insulation
Sealing the attic floor first
Before anything new goes in, our crew seals the openings through your attic floor around pipes, wires, the hatch and the light fixtures, using sealant, spray foam or rigid blocking depending on the size of the gap. That's air sealing, closing the gaps so the insulation isn't fighting a draft from the rooms below, and it also helps keep moisture out of the attic. Foam costs more and seals while it insulates, so spray foam insulation makes sense when your ductwork runs through the attic. Otherwise, sealing the gaps and topping up loose fill usually wins.
Checking the lights and wiring
Most of our retrofit jobs start with deciding whether the old layer can stay and checking your recessed ceiling lights. IC rated cans are built to touch insulation. One that isn't is a serious fire hazard once insulation surrounds it, and if we can't tell how a can is rated, we treat it as not rated. We also look for live knob and tube wiring, the old system strung on porcelain knobs, which gets dammed off where that's possible or replaced with modern wiring first. Junction boxes get covered and flagged so they stay easy to find under the new layer.
An even layer with open eaves
For the attic insulation itself, we blow in loose fill, insulation sent through a hose, to an even depth across the whole ceiling, right out to the top plate, the board along the top of the outside walls. The usual mistake is deep in the middle and thin at the edges, which is backward. Baffles at the eaves keep the vents open so the attic keeps breathing and the insulation doesn't spill into the eaves. If your attic has flooring, we lift only what we need to reach the spots underneath.
Get a written estimate for your attic and walls
We'll reply within one business day, by phone or email, to set up a free on-site estimate with no pressure to book. It helps if you know what year the house was built and whether you have recessed ceiling lights.
(925) 503-1068What a retrofit job looks like
You call or send a message
Reach us at (925) 503-1068 or through the form, and we'll set up a time for me to come out. It helps to know roughly how old the house is and which rooms feel too hot or too cold.
I look and write it up
I go up into the attic or crawl space myself and walk you through what I found and what I'd do first. The written estimate lists the prep work, like sealing or removal, along with the insulation.
Our crew does the work
Our crew lead and a small crew handle the prep first and the insulation after, cleaning up as they go. When they're done, they walk the finished job with you so you can see the sealing and the depth.
Retrofit insulation questions from Brentwood
Does my old attic insulation need to come out before adding more?
Not always. Old insulation that's dry, clean and evenly spread can often have new material blown right over it. If it's water damaged, moldy, packed flat, full of debris or fouled by rodents, it has to come out first, and that changes the whole job. I check it myself at the estimate and tell you which way yours goes.
What does blown-in attic insulation cost per square foot?
Across the US, installing blown-in attic insulation usually costs about $4 to $7.50 per square foot. That's a national figure, not a Brentwood price, and removing an old layer, extra sealing or wall work changes what your job comes to. Your written estimate lists any prep along with the insulation, so you see each part.
Can my walls be insulated without opening them up?
Usually, yes, through drill and fill. Small holes go in near the top of each wall cavity, inside or out, and the cavities get filled with blown-in insulation. Before we drill, we ask what year your house was built, because in homes built before 1980, lead safety rules may come into play depending on how much wall surface gets disturbed.
Is there help paying for insulation in Contra Costa County?
Yes, for households that qualify by income. Contra Costa County describes the BayREN EASE Home Program for income-eligible single-family residents, where an Energy Advisor recommends upgrades like insulation and BayREN covers most of the cost of core weatherization and efficiency work. You can look into it on the county's BayREN page before you book.