Sarnatherm® XPS tapered
Sarnatherm® XPS tapered is a sloped, rigid extruded polystyrene insulation board that can be used in either a Sika roofing or waterproofing application.
- Low water absorption
Usage
Wherever insulation is required within a conventional roof assembly and waterproofing systems. Areas of Application- New Roofs
- Recover Roofs
- Mechanically Attached Systems
- Adhered Systems
- Waterproofing Systems
Advantages
- Low water absorption
Packaging
- Various Thicknesses
- Sarnatherm per bundle depends on thickness
Product Details
APPROVALS / STANDARDS
- ASTM C 578, Type XII, X, XIII, IV, VI, VII, V
- CAN/ULC S701, Type 4
Chemical Base
Polystyrene foam core with a smooth skin surface on the face and back surfaces
Shelf Life
N/A
Storage Conditions
When stored outdoors, the insulation should be stacked on pallets at least 4” (102 mm) above the surface level and protected from exposure to direct sunlight and weather using an opaque, light-colored tarpaulin. Do not use a dark colored tarpaulin. The factory applied packaging is intended only for protection during transit and should only be slit enough to prevent accumulation of condensation then removed prior to immediate use. Insulation that becomes wet or damaged should be removed and replaced with dry insulation
Thickness
Thermal Data*
| Thickness | R-Value | C-Value |
| 1.0" (25 mm) | 5.0 | 0.200 |
| 1.5" (38 mm) | 7.5 | 0.133 |
| 2.0" (51 mm) | 10.0 | 0.100 |
| 2.5" (64 mm) | 12.5 | 0.080 |
| 3.0" (76 mm) | 15.0 | 0.067 |
| 4.0" (102 mm) | 20.0 | 0.050 |
*Not all available thicknesses are listed.
Compressive Strength
| Type VI | Type VII | Type V |
| 40.0 psi (276 kPa) | 60.0 psi (414 kPa) | 100 psi (690 kPa) |
Minimum values at yield or 10 % deformation, whichever occurs first.
Flexural Strength
| Type VI | Type VII | Type V |
| 60.0 psi (414 kPa) | 75.0 psi (517 kPa) | 100 psi (690 kPa) |
Minimum values
Dimensional Stability
| Type VI | Type VII | Type V |
| <2% | <2% | <2% |
Thermal resistance
| Type VI | Type VII | Type V |
| 5.0 | 5.0 | 5.0 |
Service Temperature
Maximum Use Temperature
| Type VI | Type VII | Type V |
| 165°F (74°C) | 165°F (74°C) | 165°F (74°C) |
Water Absorption
| Type VI | Type VII | Type V |
| <0.3 | <0.3 | <0.3 |
Permeability to Water Vapor
| Type VI | Type VII | Type V |
| < 1.5 perm | < 1.5 perm | < 1.5 perm |
*Water vapor permeance varies with product type and thickness. Values are based on the desiccant method and they apply to insulation 1" (25 mm) or greater in thickness
Reaction to Fire
| Type VI | Type VII | Type V |
| Oxygen Index | Oxygen Index | Oxygen Index |
| 24.0 | 24.0 | 24.0 |
% by volume
| Type VI | Type VII | Type V |
| Flame spread | Flame spread | Flame spread |
| 5 | 5 | 5 |
| Type VI | Type VII | Type V |
| Smoke Developed | Smoke Developed | Smoke Developed |
| 165 | 165 | 165 |
*These values are not intended to reflect hazards presented by this or any other material under actual fire conditions
Application
APPLICATION INSTRUCTIONS
Sarnatherm® XPS tapered is installed either under or over the Sika roofing/waterproofing membrane depending on the system design. Overburden is utilized to hold the insulation in place in a waterproofing application. Polystyrene should not come in contact with PVC. Always place a separation layer such as Sarnafelt NWP between the Sarnatherm® XPS tapered and the membrane in both roofing and waterproofing applications. During installation in hot, sunny weather, protect the insulation with a white covering to prevent excessive heat build‐up and potential warping of the insulation boards.