
Product Introduction
Bitumen, commonly known as asphalt, is a rich, dark, and exceptionally thick liquid or semi-solid derived from petroleum. Renowned for its extraordinary waterproofing characteristics, bitumen is a staple in the construction world. Bituminous membranes offer an optimal solution for waterproofing needs across a wide array of structures, including roofs, basements, underground facilities, bridges, and more. Two predominant techniques are employed in their application.
The techniques are: the Torch-on method and Self-adhesive method.
Torch-on bituminous membranes provide a flexible and uncomplicated answer for diverse weather conditions. When CHENHUA membranes are installed, they create a seamless, impervious shield that adheres robustly to the surface.
Top cover |
Polyethylene Film or other films |
Sand or other granular |
Popular thickness |
3mm 4mm 5mm |
3mm 4mm 5mm |
Reinforcement |
PY or Fiberglass |
PY or Fiberglass |
Size/roll |
1mx10m ,1mx8m ,1mx7.5m |
1mx10m, 1mx8m, 1mx7.5m |

Torch Down Bitumen Waterproof Membranes are widely adopted in a range of construction levels for waterproofing and seepage protection projects. They are suitable for both open and hidden locations, covering flat roofs, sloped roofs, tunnels, bridges, parking areas, reservoirs, and more, ensuring comprehensive protection.
Application method:
1. Substrate:
Verify that the substrate is thoroughly clean, dry, and free of contaminants, achieving an impeccable preparation.
Eliminate all dust and loose, friable materials completely.
Expose any blowholes and voids for full repair.
2. Primer:
Before laying the membrane, apply primer. Use a blower or dust catcher for cleaning, then effectively cover with a treatment primer to ensure waterproofing, facilitating dust consolidation and improved adhesion.
3. Membrane placement:
*Gently unroll and precisely align the torch-on membrane before starting torching or bonding.
*Lay each membrane parallel, ensuring a staggered placement by at least 1 meter to avoid joint overlap.
*Alternate end-to-end overlaps, avoiding a linear arrangement.
*Begin at the lowest gradient, addressing drains, downpipes, and other specific details first.
*During the torching process, evenly heat both the membrane and substrate, focusing on the rolling and overlapping zones.
*Ensure overlaps are meticulously welded, with a thin strip of molten mixture, about 1 cm in width, visible along the seam.
4.Use a roller to firmly press the membrane surface, ensuring secure and reliable adhesion.
Attention:
1. Confirm the substrate is dry and clean. Never work on rainy or snowy days.
2. Avoid working in strong winds exceeding grade 5.
3. Inappropriate for use in temperatures below 5°C.
4. During rain or snow, ensure the laid membrane is protected.
5. All installers must wear appropriate uniforms for safety, and fire control equipment is necessary.

Packing and shipping:
1. Store membranes in dry, well-ventilated surroundings.
2. Different membrane varieties should be stored separately.
3. Typically, the storage period is a year from the date of production.
4. During transport, membrane rolls should stand upright and be shielded from light and rain.
With pallet |
Seaworthy plywood pallet packing, 20pallets/20ft container |
Without pallet |
Plastic bag per roll, common or OEM with customer brand |

1) What's the popular size for Torch-on bitumen membrane?
-3mm x 1m x 10m with either PE or sand granular top.
-Dimensions: 4mm thickness x 1m width x 10m length, available with a sophisticated PE or sand granular top finish.
2) What's the fundamental difference between SBS and APP?
-SBS (Styrene-Butadiene-Styrene) and APP (Atactic Polypropylene) are premium modifiers crafted to elevate the performance of waterproof membranes. SBS modifiers dramatically enhance cold resistance, making them perfect for freezing conditions, while APP modifiers amplify heat resistance, offering superior protection in hot environments. Despite their similar appearance, their functional enhancements are distinct and tailored for specific climate challenges.
3) Is OEM available?
-Absolutely. We enthusiastically invite you to discover our customized OEM services, designed to meet your unique requirements.
Just provide us with your logo, and we can create a customized design to reflect your brand identity. Alternatively, send us your completed design, and we'll expertly print it on PE film, ensuring it is beautifully packaged before it arrives at your door.
4) Are you a factory?
-Indeed, Shandong Chenhua Waterproof Co., Ltd. stands as a seasoned professional factory with a rich history in producing an extensive range of waterproof materials since 1994. Strategically located in the prestigious China Waterproof Town -- Taitou, we offer a diverse selection of products that fulfill comprehensive waterproofing solutions for both concealed and exposed surfaces.
5) What is the delivery time?
-Upon order confirmation, we typically fulfill your request within a swift 10-day period. However, please be aware that delivery times may vary depending on specific requirements and the size of your order.
