Expanded Polystyrene (EPS) in Zone 2 (Hot)
Expanded Polystyrene (EPS) provides R-3.9 per inch of thickness at a material cost of $0.12 per square foot per R-value point. In Climate Zone 2 (Hot), with 2,000 HDD and 3,500 CDD, see the thickness and cost required for each building component below.
Specifications
Expanded Polystyrene (EPS) Requirements by Component in Zone 2
The table below shows the DOE recommended R-value, required thickness of Expanded Polystyrene (EPS), material cost per square foot, and total material cost per 1,000 square feet for each building component in Climate Zone 2. Components where Expanded Polystyrene (EPS) 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-38 | 9.7" | $4.56 | $4,560 | Yes | Yes |
| Wall Cavity | R-13 | 3.3" | $1.56 | $1,560 | Yes | - |
| Wall Continuous (Exterior) | N/R | - | - | - | - | Yes |
| Floor (Over Unconditioned Space) | R-13 | 3.3" | $1.56 | $1,560 | Yes | Yes |
| Basement Wall | N/R | - | - | - | - | - |
| Crawlspace | N/R | - | - | - | - | - |
| Cathedral Ceiling | R-22 | 5.6" | $2.64 | $2,640 | Yes | - |
| Garage Ceiling (Below Living Space) | R-19 | 4.9" | $2.28 | $2,280 | Yes | - |
Expanded Polystyrene (EPS) in Zone 2 — Guidance
Expanded Polystyrene (EPS) at R-3.9 per inch is a reliable and proven insulation material suitable for a range of applications. In Climate Zone 2 (Hot), the lower R-value requirements mean that Expanded Polystyrene (EPS) can achieve the necessary thermal performance with relatively thin installations. This product is suitable for DIY installation, which can reduce total project costs by 30 to 50 percent compared to professional installation. Ensure that Expanded Polystyrene (EPS) is installed in a dry location protected from direct moisture exposure. For the specific R-value requirements in Zone 2, review the component comparison table above to see the thickness and cost for each building component.
States in Zone 2
These states include areas within Climate Zone 2 where the Expanded Polystyrene (EPS) requirements shown above apply. Click any state for its complete insulation recommendations.