Spray Foam Insulation in Sebastopol, CA

Spray Foam Insulation in Sebastopol deals with a town that was largely rebuilt after 1906. Sebastopol incorporated in 1902 with canneries, mills, hotels and an opera house, and Wikipedia notes the 1906 earthquake reduced most of those early buildings to rubble. A USGS shaking map found the area between Santa Rosa and Sebastopol had the most intense shaking of that quake. The town rebuilt, and many of those early-1900s houses remain.

Damp ground

The Laguna de Santa Rosa often floods in winter, sometimes cutting off Highway 12 and flooding low-lying homes and businesses on Sebastopol's east side. In those areas we look hard at crawl space moisture first. A vapor barrier and closed-cell foam under the floor tend to hold up better than batts that can sag and soak up damp air.

Old houses, simple fixes

Many older Sebastopol homes have small attics, plaster walls and open crawl spaces. Attic sealing and blown-in, R-19 under the floor and dense-pack walls are the usual plan.

Renters

At the 2020 census, 52.7% of Sebastopol's occupied homes were owner-occupied, out of 3,562 units. Attic and floor work can be done without disturbing tenants for more than a day or two.

Free weatherization

Sonoma Clean Power lists Green House Calls, free weatherization for Sebastopol residents, along with other programs.

Comfort in fog

West County gets more coastal influence than Santa Rosa. Floors and walls feel cool for much of the year, so they matter here more than in hotter inland towns.

Apple-country homes

Sebastopol's surroundings were orchard country, and many rural homes around town are older farmhouses and cottages. Those often have open crawl spaces, single-wall outbuildings and attics with little insulation. Owners converting barns or sheds into studios or ADUs often ask about spray foam for the walls and roofline.

Plan for a typical older house

Seal the attic and blow it in toward R-38 or R-49, lay a vapor barrier over bare crawl space soil and insulate under the floor to R-19, and dense-pack the walls. Foam is used where ceilings are vaulted or the crawl space stays damp.

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