Where the fog comes through
Spray Foam Insulation in Cotati, CA
A cooler, cloudier corner of Sonoma County.
- Free on-site estimates
- Itemized written quote: material, thickness or depth, and R-value per area
- Air leaks, wiring and moisture checked before anything gets covered
A Small City in the Fog Gap
Spray Foam Insulation in Cotati is about comfort in a cooler microclimate. Wikipedia explains that a gap in the coastal ridges near Petaluma often lets fog reach Cotati in summer, giving it a marine climate that is noticeably cooler and less sunny than nearby Santa Rosa and Sebastopol. Cotati averages fewer than 800 hours per growing season in the 70°F to 90°F range.
What that means for a house
Cooler, cloudier days mean floors and walls feel cold for more of the year. Underfloor insulation and wall insulation do more here than in hotter inland towns. Attic sealing still matters, since warm air escapes upward all winter.
A small, settled city
Cotati is the least populous incorporated city in Sonoma County, with 7,584 residents in 2020 and 3,209 housing units. It incorporated on July 2, 1963, less than a year after Rohnert Park, and grew quickly as a commuter town.
Drainage
Cotati lies entirely within the Laguna de Santa Rosa drainage basin, historically subject to seasonal flooding. We check crawl spaces for moisture before insulating floors.
Free weatherization
Sonoma Clean Power lists Green House Calls, free weatherization for Cotati residents.
The plaza
Cotati's hexagonal downtown plaza is California Historical Landmark No. 879. Older homes nearby are among the ones most likely to need wall and floor work.
A typical Cotati plan
For most older Cotati homes, we start under the floor: vapor barrier where the soil is bare, R-19 under the floor, and sealing at the rim. Then we seal and top up the attic. Wall insulation comes next if the house has empty walls. In newer homes, sealing the attic and garage ceiling usually does the most.
Condos and townhomes
Cotati's housing includes townhomes and small multi-unit buildings as well as single-family homes. We can insulate a single unit's attic or floor, or quote a whole building for an owner or association.
Ask for a written quote. Get a free estimate
What to Know in Cotati
- Marine climate. A gap in the coastal ridges near Petaluma often lets summer fog reach Cotati, making it cooler and less sunny than Santa Rosa and Sebastopol.
- Incorporation. Cotati incorporated on July 2, 1963, and is the least populous incorporated city in Sonoma County (7,584 in 2020).
- Housing. Cotati had 3,209 housing units in 2020, 3.7% vacant.
- Drainage. Cotati lies entirely in the drainage basin of the Laguna de Santa Rosa.
Cotati Questions
Is insulation worth it in Cotati's cool climate?
Yes. Cool, foggy days make floors and walls feel cold, and insulation there makes the biggest difference.
Do you do small homes and condos?
Yes, including attics over single-story homes and units.
Is free weatherization available?
Sonoma Clean Power lists Green House Calls for Cotati residents.
Can you insulate just one townhome unit?
Yes, if the attic or crawl space over or under that unit is separate or can be worked from safely.
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