Bitumax
APP polymer-modified bitumen waterproofing membrane, reinforced with a non-woven polyester or fiberglass carrier for absolute impermeability across roofing, foundations, tunnels and wet areas.
Engineered for the job it protects.
Manufactured using a high-tech calendering process, Bitumax is reinforced with a non-woven polyester carrier coated with APP polymer-modified bitumen. This combination delivers absolute impermeability to water together with high chemical resistance and dependable performance under heat and UV exposure.
Bitumax is installed using torch-on application, bonding securely to concrete, metal, and other prepared substrates. Its upper surface is available in a range of finish options — including colored slates for exposed applications — while the underside is laminated with a thermo-fusible polyethylene burn-off film for efficient torching and optimal adhesion.
- APP modified bitumen for reliable heat and UV resistance
- Polyester and fiberglass reinforcement variants for versatile project requirements
- Absolute impermeability to water with high chemical resistance
- Suitable for roofing, foundations, tunnels, and wet areas
- Torch-on application for secure adhesion and seamless coverage
The underside of the membrane is laminated with a thin, thermo-fusible polyethylene burn-off film to ensure efficient torch application and optimal adhesion. The membrane is available with a wide range of upper surface finishes, including multi-colored mineral slates, aluminum foil, sanded finishes, and polyethylene film.
Custom surface options and colors are available on request.
Surface Finish Flyer →Carrier: FG + PES
| Property | PES | FG | Test Method |
|---|---|---|---|
| Tensile Strength – Longitudinal | 500 N/5cm | 500 N/5cm | EN 12311-1 |
| Tensile Strength – Transverse | 300 N/5cm | 300 N/5cm | EN 12311-1 |
| Elongation @ Break – Longitudinal | 30% | ≥2% | EN 12311-1 |
| Elongation @ Break – Transverse | 30% | ≥2% | EN 12311-1 |
| Heat Stability (Flow Resistance) | 120°C | 120°C | ASTM D-5147 / EN 1110 |
| Cold Flexibility | +2 to 0°C | +2 to 0°C | ASTM D-5147 / EN 1109 |
*Insutech reserves the right to modify product specifications, descriptions, and technical information at any time without prior notice.
Application, Step by Step.
Clean the substrate of dust, debris and standing water, then repair any cracks or voids so the membrane can bond to a sound, even surface.
Apply a bituminous primer evenly across the whole surface and allow it to dry completely before any membrane work begins on the area.
Unroll and align the membrane on the primed surface, allowing the specified side and end overlaps before any bonding takes place.
Heat the burn-off film with a propane torch while progressively unrolling, pressing the membrane firmly onto the prepared substrate.
Torch and seal every overlap with a rounded trowel, checking each joint to achieve continuous, fully watertight seams across the surface.
Finish upstands, drains and penetrations with reinforcing details, then protect the membrane before backfilling, screeding or tiling.
