Polystyrene foam core with a smooth skin surface on the face and back surfaces
Factory‐applied packaging is intended only for protection during transit. When stored outdoors or on the job site, the insulation should be stacked on pallets at least 4" (102 mm) above ground level and completely covered with a weatherproof covering such as a tarpaulin. The temporary factory‐applied packaging should be slit or removed to prevent accumulation of condensation. Refer to PIMA Technical Bulletin 109: Storage and Handling Recommendations for Polyiso Roof Insulation.
|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.
40 psi (275 kPa)
60 psi (480 kPa)
|3.5 x 10‐5 in/(in∙°F) (6.3 x 10‐2 mm/(m∙°C))|
Flame Spread1: 5
Smoke Developed: 165
1 This numerical flame spread rating is not intended to reflect hazards presented by this or any other material under actual fire conditions.
1.5 perm (90 ng/(Pa∙s∙m2))
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.