SBS bitumen Membrane is a polymer-modified waterproofing sheet designed to deliver long-term protection in roofs, foundations, tunnels, bridges, retaining walls, podium decks, and wet areas. By blending bitumen with SBS (styrene-butadiene-styrene) rubber, the membrane gains exceptional elasticity, cold-temperature flexibility, and high resistance to fatigue and cracks—traits that conventional oxidized bitumen or APP sheets cannot match in dynamic or low-temperature environments. If you need a membrane that stays flexible, bonds strongly, and bridges cracks year after year, SBS bitumen Membrane is the dependable choice.
What Is SBS Bitumen Membrane?
SBS bitumen Membrane is a polymer-modified bituminous (PMB) roll sheet reinforced with polyester or fiberglass and surfaced with PE film, sand, mineral granules, or aluminum foil. The SBS polymer turns standard bitumen into an elastomeric compound with:
High elongation and recovery (excellent crack-bridging on moving substrates)
Low-temperature flexibility (commonly down to −15°C to −25°C, depending on grade)
Strong adhesion to primed concrete, screed, wood, metal, and existing bitumen layers
Durable bond joints under thermal cycling and traffic loads
Other common names: SBS modified bitumen membrane, elastomeric bitumen membrane, torch-on SBS membrane, PMB (SBS) membrane, styrene-butadiene-styrene modified asphalt sheet.
Key Benefits
Flexibility in cold climates: Resists cracking when temperatures fall.
Crack-bridging and fatigue resistance: Ideal for structures with movement and vibration.
Fast, proven installation: Torch-applied, hot asphalt, cold-adhesive, or self-adhesive systems.
Versatile surfacings: Mineral granule (UV-exposed roofs), PE/sand (covered systems), aluminum (reflective).
Compatible multi-layer systems: Base + cap sheets for higher performance and durability.
Typical Uses
SBS bitumen Membrane is chosen across infrastructure and building projects where watertightness is critical:
Roofs: Exposed mineral-surfaced capsheets, inverted roofs, green roofs (root-resistant grades), terraces and podiums.
Foundations & below-grade: Rafts, retaining walls, basements, pile caps, tie-beams, lift pits.
Civil works: Tunnels, culverts, bridges, underpasses, water channels, and abutments.
Wet areas: Bathrooms, kitchens, planters, podium landscaping.
Car parks & podium decks: Systems designed for light traffic and thermal cycling.
Specialty Applications (Choosing the Right Grade)
Cold regions / high movement: Select SBS grades with very low cold flexibility (e.g., ≤ −20°C) and high elongation (≥ 40–60%) for dynamic joints and crack-prone substrates.
Exposed roofs with UV: Use mineral-surfaced capsheets (slate-colored granules) or aluminum-faced sheets for UV stability and reduced surface temperature.
Green roofs / planters: Specify root-resistant SBS membranes tested to FLL/EN standards (or equivalent).
Bridges & decks: Prefer heavy-duty polyester-reinforced SBS membranes with higher puncture resistance and heat stability for asphalt overlays (check softening point and flow).
Potable water / tanks: Only use certified grades that meet relevant hygienic standards (not all SBS membranes are approved—ask for product-specific certification).
How SBS Bitumen Membrane Is Produced
Compounding: Base bitumen is blended with SBS polymer (linear or radial), process oils, and mineral fillers to achieve target softening point, penetration, and low-temperature flexibility.
Reinforcement feed: A polyester (non-woven 160–200 g/m²) or fiberglass mat passes through the PMB compound on a continuous line.
Calendering & coating: The elastomeric compound coats both sides of the reinforcement to the designed thickness (commonly 3 mm, 4 mm, or 5 mm).
Surfacing: Top/bottom surfaces receive PE film, sand, mineral granules, or aluminum foil. A thermofusible film often indicates correct torch heating (melting pattern).
Cooling & winding: The sheet cools, is trimmed, and wound into rolls (e.g., 1 m × 10 m).
Quality control: Routine tests include tensile strength, elongation, cold flexibility, heat flow, dimensional stability, water tightness, and lap joint strength to EN/ASTM standards.
Typical Technical Characteristics (Indicative)
Thickness: 3 / 4 / 5 mm
Reinforcement: Polyester (≥ 160–200 g/m²) or fiberglass
Tensile strength: ≥ 500–800 N/50 mm (direction dependent)
Elongation at break: ≥ 40–60% (polyester-reinforced grades)
Cold flexibility: −15°C to −25°C (grade dependent)
Watertightness: Pass at 60 kPa (or as per product spec)
Heat resistance / flow: No flow at 90–110°C (per grade)
Installation Overview
Substrate prep: Clean, dry, sound surface with correct slope; repair cracks; remove dust.
Primer: Apply bitumen primer and let it dry tack-free.
Application:
Torch-on: Heat the underside thermofusible film and bond to substrate; maintain correct bleed line at laps (typically 8–10 cm side lap, 12–15 cm end lap).
Cold adhesive / hot asphalt: For sensitive sites or restricted flame areas.
Self-adhesive SBS: For detail zones or full systems where open flame is prohibited.
Layering: Use base + cap sheet systems for exposed roofs or high-demand decks.
Details: Carefully treat drains, upstands, parapets, penetrations, corners; use reinforcement strips.
Protection/finishes: Mineral granules for exposed; geo-textile + screed, tiles, ballast, or asphalt overlay for covered systems.
HS Code & CAS Numbers
HS Code (customs): 6807.10 – Articles of asphalt or similar material, in rolls (Bituminous waterproofing membranes typically fall under this heading. Confirm locally as subheadings can vary by country.)
CAS Numbers (components):
SBS polymer: 9003-55-8
Bitumen (asphalt): 8052-42-4
(Finished membranes don’t always carry a single CAS; regulators often reference component CAS numbers.)
Compliance & Standards
SBS bitumen Membrane systems are commonly tested against EN 13707 / EN 13969 / EN 14695 (EU) or ASTM D6164 / D5147 (US) depending on application (roofing, below-grade, bridge decks). Always match product certification and system build-up to project requirements, wind uplift, fire classification, and local codes.
Buying Tips
Match the grade to climate and movement: Colder climates and dynamic decks need lower cold-flex values and higher elongation.
Check reinforcement type: Polyester for high elongation; fiberglass for dimensional stability.
Ask for TDS + test results: Verify watertightness, cold bend, flow, and lap joint strength.
Confirm certification: Root-resistant, potable water, fire classification, or bridge deck approvals if needed.
Choose the right surfacing: Mineral for exposed UV roofs; PE/sand for covered systems; aluminum for reflective top layers.
FAQs (SBS bitumen Membrane)
1) What makes SBS bitumen Membrane different from APP membranes?
SBS uses an elastomeric rubber that gives superior low-temperature flexibility and crack-bridging. APP is more plastomeric—good heat resistance, but generally less elastic at low temperatures.
2) Can I use SBS membranes in very cold areas?
Yes. Choose a low cold-flex grade (e.g., ≤ −20°C) and a polyester-reinforced sheet for movement and thermal shock.
3) Is torch-on the only way to install SBS bitumen Membrane?
No. You can install with cold adhesives, hot asphalt, or self-adhesive variants—ideal for flame-restricted sites or detail zones.
4) Which thickness should I select: 3, 4, or 5 mm?
3 mm works for base sheets or protected layers; 4–5 mm are typical for cap sheets, exposed roofs, or heavy-duty decks. Always follow the system specification.
5) Do SBS membranes work for green roofs and planters?
Yes—if you specify root-resistant certified grades and use the full system build-up (drainage, protection, and finish layers).