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Lower energy bills, steadier indoor temperatures, and a roof system that breathes the way it should. Title 24-compliant attic insulation from a GAF-certified Sonoma County contractor since 1986.
Your attic is the single biggest temperature battleground in your home. In Sonoma County, summer attic temperatures can climb past 140°F, and winter nights routinely drop into the 30s. Without proper insulation, all of that heat — and all of that cold — pushes straight into your living space. You pay for it on every utility bill, and you feel it in every uncomfortable room.
Good attic insulation does four things at once. It keeps winter heat inside your home instead of letting it rise straight out through the ceiling. It keeps summer heat from radiating down into your bedrooms and hallways, reducing the load on your air conditioner. It helps manage moisture so your roof deck and framing stay dry. And it stabilizes room-to-room temperatures so the house actually feels comfortable, not just heated or cooled.
Homeowners in Santa Rosa, Sebastopol, Healdsburg, and Petaluma routinely see 15–30% reductions in heating and cooling costs after upgrading undersized or aged attic insulation. On a $250 monthly utility bill, that can pay the work back in three to five years — and the comfort improvement is immediate.
There is no single best insulation. The right product depends on your attic geometry, existing conditions, budget, and how you use the space above your ceiling. We install the three proven systems that make sense for Sonoma County homes.
Cellulose is our go-to for most retrofit projects. It is made from recycled paper fiber treated for fire and pest resistance, and it is blown in loose to fill every cavity, corner, and framing gap. It handles irregular attic geometry better than any batt product, it delivers a strong R-3.5 per inch, and it is one of the most cost-effective ways to reach Title 24's R-38 target on an existing home. Cellulose also dampens sound between floors — a nice bonus homeowners notice immediately.
Fiberglass batts work well in new construction and additions where the joist bays are clean, evenly spaced, and accessible. Blown-in fiberglass delivers similar benefits to cellulose in a retrofit, with slightly better moisture tolerance and a lighter weight per square foot. Fiberglass is non-combustible, will not settle significantly over time, and is a solid choice when you want a long service life with minimal maintenance.
Closed-cell spray foam delivers the highest R-value per inch (roughly R-6 to R-7) and creates an air barrier in the same pass. It is the right choice for cathedralized attics, homes with undersized rafter bays, conditioned attic assemblies, and spaces where air sealing and insulation need to happen together. Spray foam costs more per square foot, but for the right application it outperforms every other option and can allow you to move mechanicals and ducts into conditioned space.
Sonoma County sits in California Climate Zone 2. Under Title 24 — California's energy code — new construction and additions must meet a minimum of R-38 for attic insulation. For retrofits, R-38 is also the target we recommend because it optimizes the comfort-to-cost ratio for our climate. Anything less leaves real energy dollars on the table; anything more generally produces diminishing returns.
In practical terms, R-38 translates to roughly 10–12 inches of blown-in cellulose, 12–14 inches of blown-in fiberglass, or about 6 inches of closed-cell spray foam. Many Sonoma County homes built before 1990 have somewhere between R-11 and R-19 in the attic — less than half of what current code requires — which is why upgrading almost always pays off.
Insulation only works if the air sealing underneath it is done right. That is the step most contractors skip, and it is the reason "new" insulation sometimes delivers disappointing results. Here is how we do it.
We have been roofing and insulating Sonoma County homes since 1986. Our insulation work is an extension of our roofing expertise — not a separate trade we tack on. That matters because attic insulation, ventilation, and the roof assembly all have to work together. Getting one wrong compromises the other two.
If your utility bills have crept up, your upstairs runs hot in July, or you already know your attic insulation is thin — let's take a look. An attic inspection and estimate is free, and there is no obligation to move forward.
Three proven systems, each with a best-fit application.
Recycled paper fiber blown loose to fill every cavity. Best value for retrofits.
Batt or blown-in. Non-combustible, lightweight, and long-lasting.
Closed-cell foam that insulates and air-seals in one pass. Premium option.
Inspect. Air seal. Install. Document.
We measure existing R-value, check ventilation and moisture, and photograph the attic. You get a written summary before any work is quoted.
Before any insulation goes in, we seal top plates, penetrations, recessed lights, and attic hatches. This is where the biggest efficiency gains come from.
We verify intake and exhaust ventilation are balanced so the new insulation stays dry and the roof deck stays healthy.
We install cellulose, fiberglass, or spray foam to the target R-value for Climate Zone 2 and mark depth with rulers for verification.
We photograph the finished job, provide product documentation for rebates and inspections, and leave the home clean.
Free attic inspection and written estimate. Title 24 compliance and rebate guidance included.