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Owens Corning FOAMULAR 250 Extruded Polystyrene (XPS) Insulation is a closed-cell, moisture-resistant rigid foam board well suited to meet the needs for a wide variety of building applications. FOAMULAR 250 XPS insulation board is great for many residential and commercial construction applications such as wall furring, perimeter/foundation, cavity wall, pre-cast concrete, under a slab, crawl spaces, sheathing, and other applications.
| Thickness | Sq Ft Per Board | R-Value |
|---|---|---|
| 3/4″ | 32 Sq Ft | R4 |
| 1″ | 32 Sq Ft | R5 |
| 1.5″ | 32 Sq Ft | R7.5 |
| 2″ | 32 Sq Ft | R10 |
| 2.5″ | 32 Sq Ft | R12.5 |
| 3″ | 32 Sq Ft | R15 |
| 4″ | 32 Sq Ft | R20 |
Features
Applications
Slows the transmission of water vapor and moisture in masonry walls
Provides continuous insulation over wood or steel stud framing, in insulated concrete sandwich panel walls, in masonry unit cavity walls, or when used with non-penetrating, surface mounted furring systems over masonry or concrete walls
Insulates and retains its properties in below-grade perimeter and foundation applications, or directly beneath the concrete slab to complement the insulating sheathing envelope around the building framing
FOAMULAR 250 XPS insulation is great for below-grade applications. FOAMULAR XPS insulation is resistant to degradation from the components of common soils
and will retain its insulating performance characteristics even after prolonged exposure to moisture
Extruded Polystyrene Provides a weather-resistant barrier (when joints are sealed) to enhance the buildings resistance to air and moisture penetration
Product Data Table
| Property | Test Method2 | Value |
|---|---|---|
| Thermal Resistance3, R-Value (180 days) minimum, hrft2F/Btu (RSI, Cm2/W) @ 75F (24C) mean temperature |
ASTM C518 | |
| ” Thickness | 4.0 (0.70) | |
| 1″ Thickness | 5.0 (0.88) | |
| 1″ Thickness | 7.5 (1.32) | |
| 2″ Thickness | 10 (1.76) | |
| 2″ Thickness | 12.5 (2.20) | |
| 3″ Thickness | 15 (2.64) | |
| 4″ Thickness | 20 (3.52) | |
| @ 40F (4.4C) mean temperature | ||
| ” Thickness | 4.3 (0.76) | |
| 1″ Thickness | 5.4 (0.95) | |
| 1″ Thickness | 8.1 (1.43) | |
| 2″ Thickness | 10.8 (1.90) | |
| 2″ Thickness | 13.5 (2.38) | |
| 3″ Thickness | 16.2 (2.85) | |
| 4″ Thickness | 21.6 (3.80) | |
| Long Term Thermal Resistance, LTTR-Value3, minimum hrft2F/Btu (RSI, C2/W) @ 75F (24C) mean temperature |
CAN/ULC S770-03 | |
| ” Thickness | N/A | |
| 1″ Thickness | 5.0 (0.88) | |
| 1″ Thickness | 7.8 (1.37) | |
| 2″ Thickness | 10.6 (1.87) | |
| 2″ Thickness | 13.4 (2.36) | |
| 3″ Thickness | 16.2 (2.85) | |
| 4″ Thickness | 22.0 (3.87) | |
| Compressive Strength, minimum psi (kPa) | ASTM D1621 | 25 (172) |
| Flexural Strength, minimum psi (kPa) | ASTM C203 | 75 (517) |
| Water Absorption, maximum % by volume | ASTM C272 | 0.10 |
| Water Vapor Permeance, maximum perm (ng/Pasm2) | ASTM E96 | 1.5 (86) |
| Dimensional Stability, maximum % linear change | ASTM D2126 | 2.0 |
| Flame Spread | ASTM E84 | 5 |
| Smoke Developed | ASTM E84 | 45-175 |
| Oxygen Index, minimum % by volume | ASTM D2863 | 24 |
| Service Temperature, maximum F (C) | 165 (74) | |
| Linear Coefficient of Thermal Expansion, in/in/F (m/mC) | ASTM E228 | 3.5 x 10-5 (6.3 x 10-5) |
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