3mm 4mm Sbs Modified Bitumen Waterproofing Membrane For Roofs And Basement
Sbs Modified Bitumen Waterproof Membrane, Waterproofing For Roofs And Basements, Extra‑long Service Life
Product Advantages
Excellent high‑low temperature resistance: Maintains good flexibility at ‑25℃, resists flowing at high temperatures, and adapts well to all‑season environments.
High tensile strength and large elongation: The membrane deforms together with minor cracking and displacement of the substrate, delivering strong crack‑resistance performance.
Great aging and corrosion resistance: Resists UV radiation, rain erosion, acid and alkali. Suitable for both underground and exposed applications with long service life.
Firm bonding and reliable waterproof sealing: Tightly bonded to the substrate after hot‑melt construction. Overlaps fuse into an integral structure to reduce water‑channeling risks.
Strong compatibility: Compatible with various substrates and available for composite waterproofing systems to fit diverse project scenarios.
Complete specifications: Available in multiple thicknesses with top surfaces of shale, PE film or aluminum foil, meeting requirements for exposed and non‑exposed conditions.
Technical Requirements
| No. | Item | Index | ||
| Type I | Type II | |||
| 1 | Soluble matter content /(g/m²) | 3 mm | ≥2100 | ≥2100 |
| 4 mm | ≥2900 | ≥2900 | ||
| 2 | Heat resistance | Test temperature /℃ | 90 | 105 |
| Slip /mm | ≤2 | ≤2 | ||
| Test phenomenon | No flowing, no dripping | No flowing, no dripping | ||
| 3 | Low‑temperature flexibility | No cracking at −20 ℃ | No cracking at −25 ℃ | |
| 4 | Water impermeability | 0.3 MPa, 120 min, no water penetration | 0.3 MPa, 120 min, no water penetration | |
| 5 | Tensile properties | Maximum tensile force /(N/50 mm) | ≥500 | ≥800 |
| Elongation at maximum tensile force | ≥30 % | ≥40 % | ||
| Test phenomenon | During tension test: no cracking of bitumen coating in specimen middle, no delamination from reinforcement substrate | During tension test: no cracking of bitumen coating in specimen middle, no delamination from reinforcement substrate | ||
Construction Introduction
Substrate Requirements
The substrate shall be flat, solid and dry, free of sanding, hollowing and sharp protrusions. Internal and external corners shall be made into circular arcs. The moisture content of the substrate shall meet construction requirements. Moist substrates shall be treated for moisture resistance.
Construction Method (Mainstream Hot‑melt Method)
Apply primer uniformly and lay the membrane only after it is fully dried.
Mark positioning lines, place the membrane in position and adjust overlap width: long‑side overlap ≥80 mm, short‑side overlap ≥100 mm.
Heat the membrane bottom and substrate with a spray gun. Roll out the membrane forward while heating to melt the asphalt on membrane bottom. Compact and vent to eliminate air under the membrane and avoid hollowing.
Fully heat overlapping joints until asphalt overflows to form uniform sealing beads for reliable joint sealing.
Reinforce details such as internal/external corners, pipe roots and drain outlets with additional layers before laying main‑field membranes.
Upon completion of membrane installation, inspect for hollowing, edge lifting and cracking and repair defects in time. Apply protective layers promptly for non‑exposed roofs.
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