Attic insulation in San Diego, done to code.
Most San Diego attics top out at R-19 or less. California Title 24 wants R-30 minimum on a re-roof and R-38 to R-60 on new and remodeled work. We measure what's up there, calculate what's missing, and blow in cellulose or fiberglass to the line marked on the rafters. Same-day install on most homes.
What's included in this service?
- Inspect existing attic insulation depth and condition
- Calculate target R-value per Title 24 climate zone (most of SD is CZ7 or CZ10)
- Air-seal top plates, can lights, and chases before blowing
- Install proper baffles at the eaves to keep soffit vents clear
- Blow in loose-fill cellulose or fiberglass to marked depth
- Install batt insulation in tight rafter bays where blown-in is impractical
- Replace recessed-light covers and add IC-rated airtight boxes where needed
- Mark rulers on rafters so future inspections can verify depth
When do you need this service?
- Upstairs rooms run hot in summer or cold on winter mornings
- Existing insulation looks compressed, dirty, or under R-19
- Rodent or roof leak damage has fouled old insulation
- You are reroofing and want to top up at the same time
- You bought a 1960s–1980s home with original insulation
- You are claiming a Title 24 alteration or HERO/PACE rebate
- You hear HVAC ducts running constantly to keep temperature
What do homeowners ask about Attic?
What R-value do I need for an attic in San Diego?
California Title 24 sets R-30 as the minimum for a roof alteration and R-38 for most new or fully reinsulated attics. If we're already in there, we usually recommend R-49 or R-60 — the marginal cost is small and the comfort difference is real. We'll mark the target depth on the rafters before blowing.
Should I remove old insulation first?
Only if it is contaminated by rodents, water, smoke, or vermiculite. Healthy old fiberglass or cellulose can be topped up. We inspect first, photograph anything questionable, and quote removal separately if it is needed.
How long does it take?
A 1,500–2,000 sq ft attic with normal access usually takes one crew 4 to 8 hours. Cathedral ceilings, low-pitch roofs, and homes with ducts in the way add time. We stage the truck near the access hatch and run a hose up.
Do you air-seal first?
On every job. Insulation slows heat. Air-sealing stops the leaks that move that heat. We foam top plates, attic hatches, plumbing chases, and recessed lights before we blow in loose-fill — otherwise you are insulating a screen door.
Will this help my AC bill?
Most San Diego homes that go from R-19 to R-49 see a 10 to 25 percent drop in cooling load on the hottest days. Inland and East County homes see more; coastal homes see less. Air-sealing in the same visit is what locks in the savings.
Where do we offer Attic in San Diego County?
We provide attic in every city and community in San Diego County. Pick your city for local climate notes and service specifics.
See attic in all 48 cities
Homeowners who hired us for this
We had R-13 batts from 1979 that had settled to nothing. Crew air-sealed top plates first, then blew cellulose to R-49. Upstairs bedrooms feel different now — the AC actually keeps up on hot afternoons.
Got three quotes. Thermal Pro was the only one who recommended air-sealing before insulation and pushed for the radiant barrier given the East County heat. Bill dropped 18 percent in the first August. Worth every dollar.
Our vaulted ceiling was the hottest room in the house. Closed-cell foam at the roof deck completely changed the room. Crew masked everything carefully, came back to check the cure, walked us through the reoccupancy timeline. Professional all the way.
Need attic in San Diego County?
Call for a free quote. Most work scheduled within the week.