Common questions. Straight answers.

Cost depends on attic size, current R-value, the R-value you are aiming for, access and the material. The pro we connect you with quotes after seeing the home.

Cost depends on foam type, thickness, the assembly and how much area is covered. Spray foam costs more than cellulose but does insulation and air-seal in one application. The pro we connect you with quotes after seeing the home.

Cost depends on attic size, how contaminated the material is and access. Removal is quoted separately from the new insulation, so ask the pro for each line item.

Some. The federal 25C tax credit expired for installs after 2025, so 2026 projects don't earn a federal credit. SDG&E periodically offers insulation rebates tied to whole-home programs, and HERO and PACE programs allow financing through your property tax bill. Ask the pro you are matched with what is active and what documentation a rebate needs.

California Title 24 sets R-30 minimum on roof alterations and R-38 on most full reinsulations. R-49 is a common target, since the step up from R-38 adds comfort. Inland and East County homes benefit most.

Depends on the assembly. Cellulose blown-in is the workhorse for vented attic floors. Closed-cell spray foam handles unvented roof decks, rim joists, and crawlspaces. Open-cell foam quiets cathedral ceilings. Batts work in open framing for new construction. The right method is the one that fits your home, so ask the pro why they recommend it.

In most San Diego climate zones, no separate vapor barrier is required on attic floors. Crawlspaces always need a 10–20 mil vapor barrier on the dirt floor. Some wall assemblies in inland zones use faced batts (kraft paper retarder); the pro follows Title 24 prescriptive requirements for your specific assembly.

A typical attic top-up runs 4 to 8 hours for one crew. Spray foam jobs run 1 to 3 days depending on scope. Crawlspace work runs 1 to 3 days. Garage conversions run 1 to 2 days. The pro confirms the schedule before booking.

When the existing insulation is rodent-contaminated, water-damaged, smoke-damaged, or pre-1990 vermiculite (which may contain asbestos). Healthy old fiberglass or cellulose can usually be topped up with new material on top, no removal needed.

Yes. The pros we connect you with treat rodent-contaminated insulation as biohazard, vacuum-extract it, sanitize the deck, and bag the waste for proper disposal. If there is an active infestation, you will need a pest contractor to seal entry points first.

Pre-1990 vermiculite (gray, pebble-like loose-fill) may contain asbestos. The pro does not remove asbestos-containing material, that is a state-licensed abatement scope. We will identify it on the first visit and refer you to a licensed abatement contractor before reinsulating.

Insulation slows heat by trapping still air. Moving air bypasses insulation completely. We've measured 30–50 percent of total heat loss in older San Diego homes coming through air leaks rather than through the insulation. Sealing first is what makes new insulation actually work.

Top plates, recessed lights, attic hatches, plumbing chases, HVAC chases, rim joists, and around exterior penetrations. The crews we send caulk, foam, and gasket each one.

Not always. For most retrofits we find leaks visually plus a thermal camera on a cool morning. Blower-door tests make sense on whole-home performance contracts and Title 24 alteration projects. We tell you when it's worth the cost.

Depends on moisture. If the crawl is dry and well-vented, subfloor batts plus a vapor barrier on the ground is enough. If it stays damp, the pro moves the insulation to the foundation walls and seal the vents, full encapsulation. The pro runs a moisture meter on the first visit to make this call.

Yes. The pro delivers insulation specs your plan reviewer needs (R-13 walls, R-30 to R-38 ceiling, garage door panel kit, slab edge rigid foam, and air-sealing). The pro coordinates with your framer and drywall trades on schedule.

Yes. Dense-pack cellulose or injection foam goes through small drilled holes, usually two per stud bay from the interior or exterior. The pro patches and texture the holes and leave the wall paint-ready.