Home insulation in Hawthorne CA - cooler rooms upstairs and a sounder attic

A contractor licensed by the California Contractors State License Board should do it, and the board's C-2 license class is the one that covers installing insulation. The state requires a license for any job that costs $1,000 or more or uses hired workers, among other cases. We're fully licensed and insured.

National attic guidance calls for checking the attic for water leaks, moisture, structural damage and pest damage before work starts, and giving the owner a list of needed repairs. Fixing those first means the new insulation goes into a sound attic instead of sitting on wet wood or old droppings. The same guidance holds off on new insulation over active knob and tube wiring, the old wiring strung on porcelain knobs, until it's replaced or properly boxed in, so some homes need electrical work added to the plan.

The work stops until it's dealt with, because national attic guidance says vermiculite may contain asbestos. It looks like small gray-brown or gold pebbles rather than fluffy batts or fibers. If you think you have it, tell us at the start so the plan accounts for it before anyone disturbs it.

The usual way is drill and fill, where the crew drills small holes into each empty wall cavity, blows in insulation and seals the holes. National guidance calls it a common method for older homes in temperate climates, since the walls gain insulation through small openings. If your house was built before 1980, that guidance also flags lead safety rules that depend on how much of the wall gets disturbed inside and out, so bring that up when we talk about your walls.

Attic insulation in the Los Angeles area usually runs about $2,500 to $6,500 per job, from a simple top-off up to pulling out the old material and replacing it. Where your house lands depends on its size, what's already up there and what has to be fixed first. I'll give you your own price in writing after I've seen the attic.

For most attics, sealing the gaps and topping up with loose fill is the better buy, and spray foam earns its higher price mainly when the ductwork runs through the attic. Foam seals air as it insulates, while fiberglass and cellulose don't block air at all, so ask how any quote handles air sealing as its own step. One cellulose industry group says that material can keep working well for decades when it's put in properly, which is why the install matters as much as what you pick.