Rigid Board
EPS Foam Board Insulation
Complete guide to eps foam board insulation: R-value, installed cost, pros, cons, and best applications.
Key Specifications
3.6–4.2
R-Value per Inch
$0.50–$1.00
Material Cost/sqft
$1.20–$2.00
Installed Cost/sqft
16"
Depth for R-60
Cost Analysis (1,200 sq ft Attic)
| Option | Low Estimate | High Estimate |
|---|---|---|
| Material only (DIY) | $600 | $1,200 |
| Professionally installed | $1,440 | $2,400 |
*Estimates for a full install to Climate Zone 5 R-60 depth. Use the calculator for your specific situation.
+ Pros
- ✓Moisture resistant — good below-grade performance
- ✓Consistent R-value (does not drift over time)
- ✓Recyclable and widely available
- ✓Can be cut with a utility knife
− Cons
- ✗Lower R-value per inch than XPS or polyiso
- ✗Requires careful sealing of seams for best performance
- ✗Must be covered with drywall or ignition barrier
- ✗Labor intensive for large attic installations
Best Applications
- →Flat or low-slope roofs (cover board application)
- →Continuous insulation layer in hybrid assemblies
- →Basement walls and slab-edge insulation
Comparing Insulation Types
EPS Foam Board is a rigid board insulation. With R-3.6–4.2 per inch, it delivers solid performance for most climate zones.
View full insulation type comparison →Explore Other Insulation Types
Is EPS Foam Board Right for Your Attic?
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