Insulation Rigid Foam
DuPont STYROFOAM Brand XPS Scoreboard
DuPont STYROFOAM Brand XPS Scoreboard (SRM-25) is an unfaced extruded polystyrene rigid foam board, 4 ft × 8 ft, in 1"–4" thicknesses (R-5 to R-20). 25 psi compressive strength — suited for under-slab, foundation walls, and exterior continuous insulation where moisture exposure is a factor. Blue color identifies STYROFOAM XPS. Pre-scored at 16" and 24" o.c. for clean snap-cutting to stud widths without a saw. R-5.0 per inch, stable across temperature ranges. Requires a 15-min thermal barrier in occupied interior spaces.
Material
Extruded polystyrene (XPS)
Astm Type
C578 Type II
Color
Blue
Faced
No
Facing
None (XPS skin integral)
Scored
Yes
Model Comparison
4 models
| Specification | 1" | 2" | 3" | 4" |
|---|---|---|---|---|
| Model | SRM-25 | SRM-25 | SRM-25 | SRM-25 |
| r_value | 5 | 10 | 15 | 20 |
| home_depot_sku | 207285376 | 207285377 | 207285378 | 207285379 |
| lowes_sku | 5013800 | 5013801 | 5013802 | 5013803 |
Shared Specifications
All models| material | Extruded polystyrene (XPS) |
| astm_type | C578 Type II |
| color | Blue |
| faced | No |
| facing | None (XPS skin integral) |
| scored | Yes |
| score_spacing | 16" and 24" o.c. |
| r_value_per_inch | 5 |
| board_size | 4 ft × 8 ft |
| coverage_sqft_per_board | 32 |
| compressive_strength_psi | 25 |
| water_absorption_pct_max | 0.1 |
| vapor_retarder_class | II (≤1.0 perms at 1"; improves with thickness) |
| thermal_barrier_required | Yes |
| Application | Under-slab, foundation walls, exterior continuous insulation, below-grade |
| fire_rating | flame spread: 5 · smoke developed: 165 · standard: ASTM E84 |
| standards | ASTM C578 Type II, ASTM E84 |