SOPRASTAR GR FLEX

SOPRASTAR GR FLEX is a high performance cap sheet membrane composed of SBS modified bitumen and a composite reinforcement.

UNITS PER SKID: 25

SOPRASTAR GR FLEX and its fire-resistant variant SOPRASTAR FR GR FLEX are high-performance SBS-modified bitumen cap sheet membranes designed for use in multi-layer roofing systems. These membranes serve as the final waterproofing and protective layer in roofing assemblies, offering enhanced flexibility at low temperatures and high solar reflectivity for energy efficiency.

SOPRASTAR GR FLEX is typically used as the cap sheet in a multi-layer SBS-modified bitumen roofing system. It is installed over a compatible base sheet or interply membrane using either cold adhesive or SEBS hot bitumen (SOPRASPHALTE M). The system may include:

- Base Sheet: SBS-modified bitumen base membrane (not specified in this TDS but typically SOPREMA base sheets such as SOPRALENE or ELASTOPHENE).

- Adhesive Options: Cold adhesive applied with a notched squeegee or SEBS hot bitumen (SOPRASPHALTE M).

- Cap Sheet: SOPRASTAR GR FLEX or SOPRASTAR FR GR FLEX.

This membrane is suitable for use in commercial, institutional, and industrial roofing applications where a durable, reflective, and flexible cap sheet is required. It is especially beneficial in climates with significant temperature fluctuations due to its excellent low-temperature flexibility. The FR version is recommended for applications requiring enhanced fire resistance.

- Installation Methods:

- *Cold Adhesive:* Unroll the membrane onto the adhesive applied with a notched squeegee. End laps (100–125 mm) should be treated with additional adhesive and the final 25–50 mm welded using a hot-air welder. Side laps must also be hot-air welded.

- *Hot Bitumen:* Unroll the membrane into a bed of SEBS hot bitumen (SOPRASPHALTE M) applied with a mop.

- Selvedge Width: 100 mm (4 in) for proper lap sealing.

- Roll Dimensions: 10 m x 1 m (33 ft x 3.3 ft).

- Surface Finish: High-reflective white granules.

- Underface: Sanded for better adhesion.

- Solar Reflectance Index (SRI): SOPRASTAR GR FLEX has an initial SRI of 90 and a 3-year aged SRI of 74, making it compliant with LEED® requirements for Heat Island Reduction.

- UV Resistance: The membrane is UV-resistant due to its granulated surface, which protects the bitumen from degradation.

- Low Temperature Flexibility: Maintains flexibility down to -27 °C (-17 °F), making it suitable for cold climates.

- Fire Resistance: The FR version (SOPRASTAR FR GR FLEX) offers improved fire performance and should be used where fire classification is required.

- Thickness: Minimum thickness is 3.5 mm (138 mils), with a selvedge thickness of 2.65 mm (104 mils).

- Storage: Rolls must be stored upright with the selvedge side on top and protected from UV exposure if stored outdoors.

Limitations and Environmental Conditions:

- Temperature Range for Installation: Not explicitly stated, but based on material properties, installation should be avoided in extremely cold conditions below -10 °C (14 °F) unless special measures are taken.

- Humidity Limitations: Not specified, but standard practice suggests avoiding installation during rain or when surfaces are wet or frosted.

- Pot Life / Curing Time / Full Cure Time: Not applicable for this membrane type, as it is not a reactive liquid product.

- Thickness Limits: Minimum thickness is 3.5 mm; no maximum thickness is specified, but it is a single-ply cap sheet.

- Coverage: Each roll covers approximately 10 m² (107.6 ft²), not accounting for overlaps.

Conclusion:

SOPRASTAR GR FLEX and SOPRASTAR FR GR FLEX are ideal cap sheet membranes for SBS-modified bitumen roofing systems requiring high reflectivity, flexibility, and durability. When used with compatible base sheets and adhesives (cold or hot bitumen), they form a robust waterproofing system suitable for a wide range of roofing applications. The FR version should be selected for projects requiring enhanced fire resistance.

https://www.soprema.ca/en/products-systems/soprastar-gr-flex