Insulation Installation in Salinas, CA

Local Context

Salinas Attics Built Before Title 24 Are Running on a Few Inches of Settled Fiber

Most Salinas houses predate the R-values California asks for now. The post-war and 1970s tracts through the Alisal, Santa Rita, and Central Salinas went up with a shallow layer of blown fiber that has been settling ever since. In an attic where the material now sits below the top of the joists, the house is insulated in name only.

The climate is why people feel it at both ends of the year. Salinas nights run in the low 50s even in July and drop toward the low 40s in December and January, while daytime highs stay mild, so the heating load spreads across a long, cool, damp shoulder season instead of concentrating in a hard winter. A thin attic gives that heat away all night, every night, from October through April.

There is a pest angle too, which is the reason we do this work at all. New insulation blown into an unsealed attic is a delivery of nesting material for roof rats, and loose fiber hides the droppings and runways that would otherwise tell you they came back. Borate-treated cellulose adds some insect resistance, which is worth having in a city with year-round Argentine ant pressure and drywood termites in the older framing.