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APP Modified Bitumen Torch-Down Waterproofing Membranes – P-Series Polyester Reinforced (3mm, 4mm, 5mm)APP Modified Bitumen Torch-Down Waterproofing Membranes – P-Series Polyester Reinforced (3mm, 4mm, 5mm) — view 2APP Modified Bitumen Torch-Down Waterproofing Membranes – P-Series Polyester Reinforced (3mm, 4mm, 5mm) — view 3APP Modified Bitumen Torch-Down Waterproofing Membranes – P-Series Polyester Reinforced (3mm, 4mm, 5mm) — view 4APP Modified Bitumen Torch-Down Waterproofing Membranes – P-Series Polyester Reinforced (3mm, 4mm, 5mm) — view 5APP Modified Bitumen Torch-Down Waterproofing Membranes – P-Series Polyester Reinforced (3mm, 4mm, 5mm) — view 6APP Modified Bitumen Torch-Down Waterproofing Membranes – P-Series Polyester Reinforced (3mm, 4mm, 5mm) — view 7APP Modified Bitumen Torch-Down Waterproofing Membranes – P-Series Polyester Reinforced (3mm, 4mm, 5mm) — view 81 / 8

Construction Materials

APP Modified Bitumen Torch-Down Waterproofing Membranes – P-Series Polyester Reinforced (3mm, 4mm, 5mm)

Berk™ P-Series: Professional APP Modified Bitumen Membranes The Berk™ P-Series is a premier line of APP (Plastomeric) modified bitumen membranes engineered for high-performance waterproofing and commercial roofing. Built on a high-tensile, non-woven polyester base, the P-Series offers exceptional puncture resistance and structural durability. With an industry-leading 120°C flow resistance, Berk™ membranes are specifically designed to remain stable under intense heat, while maintaining flexibility down to -10°C. Whether you are specifying the P3000 (3mm) for base layers, the P4000 (4mm) for standard cap sheets, or the P5000 (5mm) for extreme-duty applications, Berk™ delivers absolute water impermeability and long-term protection for any low-slope or flat-roof project. Key Features: Brand: Berk™ Professional Grade Material: APP Modified Bitumen (Torch-Down) Reinforcement: High-Strength Polyester (700/400N) Heat Stability: Superior 120C Flow Resistance Range: Available in 3mm, 4mm, and 5mm thicknesses Surface Options: PE Film, Aluminum, or Slate Granules

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BERK MEMBRANE 

High-Performance Plastomeric Waterproofing for Commercial Roofing The P-Series is a line of premium APP (Atactic Polypropylene) modified bitumen membranes designed for maximum durability in demanding climates. Reinforced with high-tensile non-woven polyester, these membranes offer superior puncture resistance and flexibility. With a high-temperature flow resistance of 120°C (248°F), the P-Series is engineered for stability in extreme heat, making it the ideal choice for torch-applied roofing and waterproofing projects.

 

ModelThicknessEquivalentPrimary UseRoll Size
P30003.0 mm120 milMulti-layer base or flashing1m x 10m
P40004.0 mm160 milStandard heavy-duty cap sheet1m x 10m
P50005.0 mm200 milExtreme-duty/Heavy traffic1m x 7.5m

 

Key Performance Features

  • Superior Heat Stability: 120 C / 248 F  flow resistance—ideal for hot-weather applications.

  • High-Tensile Strength: Non-woven polyester core (700/400 N) provides excellent resistance to tearing and building movement.

  • Cold-Weather Flexibility: Tested to -10 C for reliable performance in seasonal transitions.

  • Versatile Surfacing: Available with PE Film (Smooth), Aluminum Foil, or Slate Granules for UV protection and aesthetic finish.

  • Absolute Waterproofing: Zero water permeability for long-term structural protection.

 

Application Areas

  • Flat and Low-Slope Commercial Roofs

  • Foundations and Underground Structures

  • Bridge Decks and Paving Waterproofing

  • Terraces, Balconies, and Patios

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