(858) 808-6055
Rigid Foam

Rigid foam board insulation, installed right.

Rigid foam handles thermal bridging — the heat that bleeds through studs and rafters. We install EPS, XPS, or polyiso continuous insulation on exterior walls, under flat or low-slope roofs, on the underside of slabs, and as a thermal break under siding. Detail work matters more than the boards.

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Polyiso rigid foam boards being installed on a low-slope roof deck

What's included in this service?

  • EPS, XPS, and polyiso board installation
  • Continuous exterior insulation under siding
  • Under-slab and slab-edge rigid foam
  • Roof deck insulation for unvented assemblies
  • Tape and seal seams for vapor and air control
  • Furring strip layout for siding restoration
  • Coordinate with siding, roofing, and concrete trades

When do you need this service?

  • Siding redo — add continuous insulation in the same scope
  • Low-slope roof rebuild
  • Cold floors over slab in inland or East County homes
  • Conditioned attic conversion with unvented roof deck
  • Title 24 alteration that requires continuous insulation

What do homeowners ask about Rigid Foam?

EPS, XPS, or polyiso — which board?

EPS is cheapest and vapor-permeable; good for exterior walls and below grade. XPS has higher R per inch and resists moisture; common on roofs and under slabs. Polyiso has the highest R per inch but loses some R in cold weather — fine in San Diego where it rarely gets that cold. We pick based on assembly and budget.

Will adding rigid foam mess up my windows and doors?

It pushes the wall plane out. We extend window and door jambs with proper trim, flash to drainage planes, and detail water management. This is normal exterior-insulation work and we plan for it on the quote.

Can rigid foam go under my floor?

Yes. We install rigid foam on the underside of subfloor over crawl, or on top of slabs before a new finish floor. R-5 to R-10 under a slab makes a noticeable comfort difference inland.

Service area

Where do we offer Rigid Foam in San Diego County?

We provide rigid foam in every city and community in San Diego County. Pick your city for local climate notes and service specifics.

Central Rigid Foam in San Diego Central San Diego sits between coastal humidity and inland heat. San Diego attics typically hold 1980s or older insulation that has settled to R-15 or worse. Going to R-49 cellulose plus air-sealing is the standard upgrade and pays back in 3–5 years on cooling.
North Coastal Rigid Foam in Oceanside Oceanside sees marine influence and a wide age range of housing — 1970s beach stock to new HOA builds. Older homes need a full top-up to R-49 plus air-sealing; newer ones are usually code-compliant and may only need spot work.
North Coastal Rigid Foam in Carlsbad Carlsbad sees marine influence and a wide age range of housing — 1970s beach stock to new HOA builds. Older homes need a full top-up to R-49 plus air-sealing; newer ones are usually code-compliant and may only need spot work.
North County Inland Rigid Foam in Escondido Escondido hits triple-digit summer afternoons with low humidity. Attics over R-49 with proper air-sealing typically drop cooling load 15–25 percent on the hottest days. We push to R-49 minimum and air-seal the chase penetrations first.
East County Rigid Foam in El Cajon El Cajon attics hit 150–160°F in summer and most original tract-home insulation has settled to R-15 or worse. R-49 blown-in cellulose plus air-sealing is the standard scope and one of the highest-return home upgrades in the county.
South County Rigid Foam in Chula Vista Chula Vista sits in a mixed zone — coastal-influenced west, inland-influenced east. Older homes usually need attic top-ups to R-38 or R-49; newer EastLake and Otay Ranch builds are code-compliant and may only need spot work or air-sealing.
See rigid foam in all 48 cities
Rigid Foam in AlpineRigid Foam in BonitaRigid Foam in BonsallRigid Foam in Borrego SpringsRigid Foam in BoulevardRigid Foam in CampoRigid Foam in CarlsbadRigid Foam in Chula VistaRigid Foam in CoronadoRigid Foam in Del MarRigid Foam in DescansoRigid Foam in DulzuraRigid Foam in El CajonRigid Foam in EncinitasRigid Foam in EscondidoRigid Foam in FallbrookRigid Foam in GuatayRigid Foam in Imperial BeachRigid Foam in JacumbaRigid Foam in JamulRigid Foam in JulianRigid Foam in La MesaRigid Foam in LakesideRigid Foam in Lemon GroveRigid Foam in Mount LagunaRigid Foam in National CityRigid Foam in OceansideRigid Foam in Palomar MountainRigid Foam in Pine ValleyRigid Foam in PotreroRigid Foam in PowayRigid Foam in RamonaRigid Foam in RanchitaRigid Foam in Rancho BernardoRigid Foam in Rancho PeñasquitosRigid Foam in Rancho Santa FeRigid Foam in San DiegoRigid Foam in San MarcosRigid Foam in San YsidroRigid Foam in Santa YsabelRigid Foam in SanteeRigid Foam in Shelter ValleyRigid Foam in Solana BeachRigid Foam in Spring ValleyRigid Foam in TecateRigid Foam in Valley CenterRigid Foam in VistaRigid Foam in Warner Springs
Keep reading

What should you know about Rigid Foam?

Explainers

Insulation R-value by California climate zone (San Diego County guide)

What R-value to target for attic, wall, and floor insulation across San Diego's climate zones. Real recommendations, not just code minimums.

Rebates & costs

Insulation rebates and tax credits in San Diego (2026)

Federal 25C, SDG&E, HERO, and PACE — what insulation rebates and credits actually apply in San Diego in 2026, and how to stack them.

Explainers

California Title 24 insulation requirements for San Diego homes

What Title 24 actually requires for attic, wall, and floor insulation in San Diego. Climate zones, R-value minimums, and when the rules apply.

Real feedback

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.

Melissa R. Attic Insulation · Carlsbad

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.

David K. Attic + Radiant Barrier · El Cajon

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.

Priya S. Spray Foam Cathedral Ceiling · Encinitas
Serving San Diego County

Need rigid foam in San Diego County?

Call for a free quote. Most work scheduled within the week.

(858) 808-6055 Request a quote