Blown-In Cellulose in Zone 5 (Cool)
Blown-In Cellulose provides R-3.5 per inch of thickness at a material cost of $0.07 per square foot per R-value point. In Climate Zone 5 (Cool), with 6,500 HDD and 800 CDD, see the thickness and cost required for each building component below.
Specifications
Blown-In Cellulose Requirements by Component in Zone 5
The table below shows the DOE recommended R-value, required thickness of Blown-In Cellulose, material cost per square foot, and total material cost per 1,000 square feet for each building component in Climate Zone 5. Components where Blown-In Cellulose 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 | 14" | $3.43 | $3,430 | Yes | Yes |
| Wall Cavity | R-13 | 3.7" | $0.91 | $910 | No | Yes |
| Wall Continuous (Exterior) | R-5 | 1.4" | $0.35 | $350 | Yes | - |
| Floor (Over Unconditioned Space) | R-25 | 7.1" | $1.75 | $1,750 | Yes | - |
| Basement Wall | R-10 | 2.9" | $0.70 | $700 | Yes | - |
| Crawlspace | R-10 | 2.9" | $0.70 | $700 | Yes | - |
| Cathedral Ceiling | R-38 | 10.9" | $2.66 | $2,660 | No | - |
| Garage Ceiling (Below Living Space) | R-30 | 8.6" | $2.10 | $2,100 | Yes | - |
Blown-In Cellulose in Zone 5 — Guidance
Blown-in cellulose at R-3.5 per inch is one of the most cost-effective insulation options for Zone 5 (Cool). At the moderate R-values required in Zone 5, cellulose provides an excellent balance of performance and affordability. The R-49 attic requirement is achievable with 14" of cellulose at a material cost of approximately $3.43 per square foot. Cellulose is manufactured from recycled newspaper treated with borate compounds for fire and pest resistance, making it an environmentally responsible choice. The borate treatment in cellulose provides resistance to mold, insects, and rodents, making it suitable for both attic and wall applications. Cellulose is also one of the most environmentally sustainable insulation products available, with over 80 percent recycled content.
States in Zone 5
These states include areas within Climate Zone 5 where the Blown-In Cellulose requirements shown above apply. Click any state for its complete insulation recommendations.