Spray Foam Insulation in Novato, CA

Spray Foam Insulation in Novato often means post-war homes. Wikipedia notes that after World War II Novato grew quickly with tract homes and a new freeway, much of it unplanned while the area was unincorporated, before it became a city in 1960. Houses from that era often have thin attic insulation and nothing in the walls or under the floor.

Climate

Novato's January averages 53.6°F by day and 38.7°F at night; July averages 79.9°F and 52.0°F. There are about 12.4 days a year at 90°F or more and 12.5 nights at freezing, and about 25.49 inches of rain. Spells of tule fog in winter can keep it chilly for days.

Low ground

Much of Novato used to be marshland, and with levees in the east, flooding is common in that area. For homes on low ground, we check crawl spaces for moisture before insulating and favor closed-cell foam or a vapor barrier where it stays damp.

Zone

OpenEI lists Marin County in climate zone 3C, the same as Sonoma County. ENERGY STAR's zone 3 targets are R-49 for an uninsulated attic and R-19 under floors.

Owners

The 2020 census counted 21,271 housing units, with 66.1% of occupied homes owner-occupied.

Tract homes, typical fixes

Post-war tract homes in Novato usually share a pattern: shallow attics with a few inches of old insulation, single-wall garages, and raised floors or slabs depending on the neighborhood. The most common plan is to seal and blow in the attic, insulate under raised floors, and dense-pack exterior walls where they are empty.

Hills and west Novato

Homes in the hills on Novato's west side get more sun and wind exposure and often have vaulted ceilings. Closed-cell foam during a reroof or remodel is the usual way to insulate those.

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