Description
Air/vapour barrier membrane composed of SBS modified bitumen and a glass mat reinforcement.
UNITS PER SKID: 25
Material Use:
LASTOBOND 195 is a self-adhesive SBS-modified bitumen membrane designed primarily for use as a roof underlayment and eave protection membrane. It also functions effectively as a vapour barrier in insulated roofing systems when installed over continuous substrates such as gypsum board or concrete decks. The membrane is reinforced with a glass mat and features a sanded surface, making it suitable for use under roofing shingles but not recommended under metal claddings.
System Components:
LASTOBOND 195 is a single-component membrane system but may be used in conjunction with ELASTOCOL STICK primers to enhance adhesion on challenging substrates. When used as part of an insulated roofing system, insulation panels must be adhered using hot bitumen directly over the membrane. The membrane includes a self-adhesive underface protected by a split-back silicone release film and does not require additional adhesives for installation.
Applications:
This membrane is ideal for residential and commercial roofing applications, particularly for eave protection and as an underlayment beneath asphalt shingles. It is also suitable for use as a vapour barrier in insulated roofing assemblies. Recommended substrates include plywood, OSB, and asphaltic boards such as SOPRABOARD.
Application Details:
LASTOBOND 195 is applied by removing the silicone release film and pressing the membrane firmly onto the substrate using a membrane roller to ensure full contact. The surface must be clean, dry, and free of loose particles. For enhanced adhesion, especially in special job site conditions, priming with ELASTOCOL STICK is recommended. The membrane should be covered with the final roofing material within 24 hours of installation to ensure optimal performance.
- Application Temperature Range: 4.5 °C to 50 °C (40 °F to 122 °F)
- Service Temperature Range: -45 °C to 90 °C (-49 °F to 194 °F)
- Thickness: 1.6 mm (63 mil)
- Dimensions per Roll: 19.8 m x 0.91 m (65 ft x 3 ft)
- Weight: 2.0 kg/m² (47.5 lb/ft²)
- Selvedge Width: 75 mm (3 in)
- Reinforcement: Glass mat
- Surface Finish: Sanded
- Underface: Self-adhesive with release film
- Coverage: Approximately 19.8 m² (213 ft²) per roll
Special Notes:
- LASTOBOND 195 is not UV stable and should be covered with the final roofing material within 24 hours of installation.
- The membrane passes nail sealability and low-temperature flexibility tests, making it suitable for cold climate applications.
- It has excellent adhesion properties, with adhesion to plywood rated at 120 N/m (8.3 lbf/ft) at 4.5 °C and 300 N/m (20 lbf/ft) at 24 °C.
- Water vapour permeance is very low (< 0.04 perm), making it effective as a vapour barrier.
- Rolls must be stored upright with the selvedge side on top and protected from UV exposure if stored outdoors.
This product is part of SOPREMA’s waterproofing and roofing system solutions and is compatible with other SOPREMA roofing components when used as specified.
https://www.soprema.ca/en/products-systems/lastobond-195
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