R-10 continuous on crawl space walls
In zone 4A, closed crawl space walls need R-13 cavity or R-10 continuous, double the R-5 continuous allowed in zone 3. Closed-cell foam reaches R-10 in a thin layer.
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Attic & Crawl Space · Dawson County, GA
Attic & Crawl Space Insulation in Dawsonville & Dawson County, GA
NJ Spray Foam LLC insulates attics and crawl spaces in Dawsonville and Dawson County, GA. Mountain and lake homes often sit over damp crawl spaces, and zone 4A rules ask more of crawl space walls than in metro Atlanta.
- Dawson County 30534, 30143
- 10 years of experience
- Climate zone 4A
Attic & Crawl Space Insulation in Dawson County
What to know in Dawson County
Sloped lots
Homes on slopes often have partial crawl spaces and walk-out basements. We insulate rim joists and walls where moisture gets in.
Attics
Ceilings still need R-38 (R-30 at full depth over the plates) under Georgia's amendments, or R-20 of spray foam at the roof deck.
Attic & Crawl Space Insulation services we offer in Dawson 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
Dawson County insulation code minimums (zone 4A)
Insulation in new homes and additions is inspected under Georgia's state energy code by Dawson County or the City of Dawsonville, depending on the address. We confirm the office before quoting.
| Location / item | Limit |
|---|---|
| IECC climate zone | 4A (mixed, 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-10 continuous |
| Unvented attic with fiberglass or cellulose | R-20 plus R-15 rigid foam above the deck |
| Air leakage test on new homes | Under 5 ACH50, by a certified verifier |
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 Dawson County: FAQ
What R-value do crawl space walls need in Dawson County?
R-13 cavity or R-10 continuous in climate zone 4A, with a sealed Class 1 vapor retarder and a 3-inch termite strip (R402.2.11).
Can spray foam fix a damp cabin crawl space?
It helps as part of a closed crawl space: sealed vapor retarder on the ground, foam on the walls and rim joists, and drainage addressed first.
What attic R-value applies in Dawsonville?
R-38 on the attic floor or R-20 of spray foam at the roof deck on the trade-off path.
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Ready to insulate in Dawson County?
NJ Spray Foam LLC installs attic & crawl space insulation across Dawson County and nearby areas. Send your address and photos to get started.