1980s and 1990s homes
Homes in Lawrenceville, Lilburn, Norcross and Snellville were insulated to far less than today's R-38 and rarely air-sealed. A retrofit removes damaged insulation and seals the roof deck.
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Retrofit · Gwinnett County, GA
Retrofit Spray Foam in Gwinnett County, GA
NJ Spray Foam LLC retrofits finished homes across Gwinnett County, GA with spray foam. Much of the county was built in the 1980s and 1990s, and those homes respond well to sealing the attic, rim joists and garage ceilings without opening finished walls.
- Gwinnett County 30043, 30518, 30024, 30096, 30017, 30019, 30052, 30039, 30092, 30071, 30047, 30011
- 10 years of experience
- Climate zone 3A
Retrofit Spray Foam in Gwinnett County
What to know in Gwinnett County
Basement rim joists
Walk-out basements on north Gwinnett's sloped lots often leak air at the rim joists. Closed-cell foam stops drafts and moisture there in one pass.
Owners, landlords and HOAs
We work for owners and for landlords between tenants. Retrofit work is inside the house, so HOA approval is rarely needed; we follow community rules on parking and hours.
Retrofit Spray Foam services we offer in Gwinnett County
Spray foam upgrades for homes and buildings that are already finished: we remove what is not working, seal the leaks and add foam where it can be reached without tearing the house apart.
- Removal of old, wet or contaminated insulation
- Roof-deck spray foam in existing attics
- Rim joist and crawl space retrofits
- Bonus room, knee wall and garage ceiling upgrades
- Air sealing around ducts, chases and top plates
Gwinnett County insulation code minimums
Gwinnett County Planning & Development permits unincorporated areas and requires the energy code affidavit for new homes and additions. City addresses follow the city's process; we confirm it for yours.
| Location / item | Limit |
|---|---|
| IECC climate zone | 3A (warm, humid) |
| Attic floor (ceiling) insulation | R-38, or R-30 at full depth over the top plates |
| Spray foam at the roof deck (unvented attic) | R-20 minimum on the trade-off path |
| Wood-frame exterior walls | R-13 |
| Unvented crawl space walls | R-13 cavity or R-5 continuous |
| Air leakage test on new homes | Under 5 ACH50, by a certified verifier |
| New-home permits (unincorporated) | Energy code compliance affidavit |
Adding blown-in vs retrofitting with spray foam
| Add blown-in insulation | Retrofit with spray foam | |
|---|---|---|
| Air sealing | Little; air still moves through | Seals the surface it covers |
| Ducts in the attic | Stay on the hot side | Can be brought inside the envelope |
| Disruption | Low | Low to moderate; some removal may be needed |
| Best for | Attics that only need more depth | Hot rooms, drafts, ducts in the attic |
Our retrofit process
- 1
Assessment
We find where heat and air get in: attic, knee walls, rim joists, crawl space or garage ceilings.
- 2
Scope
We list what stays, what is removed and where foam goes, with the expected R-value for each area.
- 3
Removal and prep
Old insulation is bagged and removed when needed; we protect living areas and HVAC returns.
- 4
Foam and seal
Spray foam is applied to reachable surfaces and gaps are sealed.
- 5
Clean-up
Debris and overspray are removed and we walk the work with you.
Retrofit Spray Foam in Gwinnett County: FAQ
Can you retrofit without opening my walls?
Yes, in most homes. Attics, knee walls, rim joists, crawl spaces and garage ceilings are reachable without touching finished walls.
Will I qualify for Georgia Power's attic rebate?
If Georgia Power supplies your home and the attic is at R-38 or less, HEIP pays up to $300 for upgrading to R-49. Confirm with the program before work starts.
How long does a retrofit take?
Most attic retrofits take one to two days, including removal of old insulation.
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Ready to insulate in Gwinnett County?
NJ Spray Foam LLC installs retrofit spray foam across Gwinnett County and nearby areas. Send your address and photos to get started.