Seal first, then insulate
Top plates, recessed lights, hatches and duct chases are where attic air leaks into Gwinnett homes. We seal them before adding depth to R-38 or foaming the roof deck.
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Attic & Crawl Space · Gwinnett County, GA
Attic & Crawl Space Insulation in Gwinnett County, GA
NJ Spray Foam LLC insulates attics and crawl spaces across Gwinnett County, GA. Most Gwinnett attics date from the 1990s, have settled insulation and carry ductwork, and lake-side and older homes add damp crawl spaces to the list.
- Gwinnett County 30043, 30518, 30024, 30096, 30017, 30019, 30052, 30039, 30092, 30071, 30047, 30011
- 10 years of experience
- Climate zone 3A
Attic & Crawl Space Insulation in Gwinnett County
What to know in Gwinnett County
Closed crawl spaces
Georgia's R402.2.11 lets you insulate crawl space walls instead of the floor when the crawl space is unvented: R-13 cavity or R-5 continuous in zone 3A, a sealed Class 1 vapor retarder and a 3-inch termite inspection strip.
Rebates
Georgia Power customers can apply for up to $300 for an attic upgrade from R-38 or less to R-49 through HEIP; Jackson EMC members can ask about that utility's insulation rebate.
Attic & Crawl Space Insulation services we offer in Gwinnett County
Insulation and air sealing for the two places Georgia homes lose the most comfort: the attic above and the crawl space below, with spray foam, blown-in insulation or both.
- Roof-deck spray foam for unvented attics
- Blown-in top-ups on the attic floor
- Removal of old or damaged insulation
- Crawl space wall and floor insulation
- Air sealing at top plates, chases and penetrations
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 |
Vented attic vs unvented spray foam attic
| Vented attic (insulate the floor) | Unvented attic (foam the roof deck) | |
|---|---|---|
| Where the insulation goes | On the attic floor | Under the roof deck and gable walls |
| Ducts and air handler | Stay in a hot attic | End up inside the conditioned space |
| Georgia code minimum | R-38 (R-30 at full depth) | R-20 air-impermeable on the trade-off path |
| Best for | Simple attics without HVAC equipment | Attics with ducts, equipment or storage |
Our attic & crawl space process
- 1
Inspection
We check insulation depth, ductwork, ventilation, moisture and access in the attic and crawl space.
- 2
Plan
Vented or unvented attic, floor or wall crawl space insulation, and the R-values each option needs in Georgia.
- 3
Removal if needed
Wet, compressed or contaminated insulation comes out before new work goes in.
- 4
Install
Spray foam, blown-in insulation or both, with air sealing at the gaps that leak most.
- 5
Final check
We confirm depth and coverage and leave the access points clean and closed.
Attic & Crawl Space Insulation in Gwinnett County: FAQ
Should I top up my attic or foam the roof deck?
Top up to R-38 if the attic is clear and only needs depth; foam the roof deck if ducts or the air handler are in the attic.
What does Georgia require to insulate crawl space walls in Gwinnett?
An unvented crawl space, a sealed Class 1 vapor retarder lapped 6 inches and run 6 inches up the stem wall, a 3-inch termite strip, and R-13 cavity or R-5 continuous insulation (R402.2.11).
Do you remove old attic insulation?
Yes, when it is wet, contaminated or compressed.
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Ready to insulate in Gwinnett County?
NJ Spray Foam LLC installs attic & crawl space insulation across Gwinnett County and nearby areas. Send your address and photos to get started.