Blown-In Fiberglass in Zone 4 (Mixed)
Blown-In Fiberglass provides R-2.5 per inch of thickness at a material cost of $0.08 per square foot per R-value point. In Climate Zone 4 (Mixed), with 5,000 HDD and 1,200 CDD, see the thickness and cost required for each building component below.
Specifications
Blown-In Fiberglass Requirements by Component in Zone 4
The table below shows the DOE recommended R-value, required thickness of Blown-In Fiberglass, material cost per square foot, and total material cost per 1,000 square feet for each building component in Climate Zone 4. Components where Blown-In Fiberglass is specifically recommended are highlighted. Components where insulation is not required show "N/R" (not required).
| Component | Required R | Thickness | $/SqFt | $/1000 SqFt | Fits Cavity | Rec. |
|---|---|---|---|---|---|---|
| Attic | R-49 | 19.6" | $3.92 | $3,920 | No | Yes |
| Wall Cavity | R-13 | 5.2" | $1.04 | $1,040 | No | Yes |
| Wall Continuous (Exterior) | R-5 | 2" | $0.40 | $400 | Yes | - |
| Floor (Over Unconditioned Space) | R-25 | 10" | $2.00 | $2,000 | No | - |
| Basement Wall | R-10 | 4" | $0.80 | $800 | Yes | - |
| Crawlspace | R-10 | 4" | $0.80 | $800 | Yes | - |
| Cathedral Ceiling | R-38 | 15.2" | $3.04 | $3,040 | No | - |
| Garage Ceiling (Below Living Space) | R-30 | 12" | $2.40 | $2,400 | No | - |
Blown-In Fiberglass in Zone 4 — Guidance
Blown-In Fiberglass at R-2.5 per inch is a reliable and proven insulation material suitable for a range of applications. In Climate Zone 4 (Mixed), the moderate R-value requirements provide flexibility in choosing between different insulation types based on your specific application and budget. Professional installation is required for this product, which adds labor costs but ensures proper application and rated performance. Ensure that Blown-In Fiberglass is installed in a dry location protected from direct moisture exposure. For the specific R-value requirements in Zone 4, review the component comparison table above to see the thickness and cost for each building component.
States in Zone 4
These states include areas within Climate Zone 4 where the Blown-In Fiberglass requirements shown above apply. Click any state for its complete insulation recommendations.