
Product Introduction
Bitumen, or asphalt, is an incredibly versatile, viscous liquid or semi-solid black form of petroleum. Renowned for its exceptional waterproofing capabilities, it is a preferred choice in construction. Bituminous membranes, designed for durability and efficiency, are ideal for waterproofing roofs, basements, substructures, bridges, and more. There are two primary methods of applying bitumen membranes.
One method is Torch-on, and the other is Self-adhesive.
Torch-on bituminous membranes offer a highly effective, straightforward, and seamless waterproofing solution suitable for any season. When applied, CHENHUA bituminous membranes form a robust, watertight layer that adheres completely 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 extensively utilized across various building waterproofing and seepage-proofing projects. They excel in both exposed and concealed applications including flat roofs, sloped roofs, underground areas, tunnels, bridges, parking lots, reservoirs, and more.
Application method:
1. Substrate:
Ensure the substrate is impeccably clean, thoroughly dry, and devoid of any contaminants, with proper preparation.
Remove all dust and any loose, friable material completely.
Any blow holes and voids must be fully exposed and meticulously repaired.
2. Primer:
Before membrane application, coat the substrate with a specialized treatment primer for waterproofing to consolidate dust and enhance adhesion. Utilize a dust catcher or blower to ensure cleanliness.
3. Membrane placement:
*Carefully unroll the torch-on membrane and precisely align it before torching or bonding.
*Each membrane should be placed parallel and staggered by at least 1 meter to prevent joint alignment.
*End-to-end overlaps must alternate and not align in a continuous line.
*Begin installation at the lowest slope height, accommodating drains, downpipes, or other details.
*While torching, ensure simultaneous heating of the membrane and substrate, focusing on the roll and overlap areas.
*Overlaps must be meticulously welded until a neat trickle of melted mix approximately 1 cm wide emerges along the overlap line.
4.Utilize a roller to firmly press the membrane surface, ensuring a secure and enduring bond.
Attention:
1. The substrate must remain dry and clean. Refrain from working in rainy or snowy conditions.
2. Avoid working in strong winds exceeding a 5-grade scale.
3. Construction is not recommended at temperatures below 5°C.
4. In the event of rain or snow during installation, protective measures for the laid membrane are essential.
5. All personnel must wear designated safety uniforms, and fire control equipment is mandatory for safety during installation.

Packing and shipping:
1. Store membranes in dry, well-ventilated environments to maintain quality.
2. Different membrane types should be stored separately to avoid mix-ups.
3. Under normal conditions, the storage duration is one year from the production date.
4. During transportation, membrane rolls should stand vertically and be protected from direct sunlight 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 are the popular sizes for Torch on bitumen membranes?
- 3mm x 1m x 10m with PE or sand granular top finish
- 4mm x 1m x 10m with PE or sand granular top finish
2) What's the difference between SBS and APP?
-SBS and APP are influential modifiers that enhance the performance of waterproof membranes. SBS modifier significantly boosts the cold resistance properties, making it ideal for use in colder climates. On the other hand, the APP modifier amplifies heat resistance, rendering it perfect for hot environments. Visually, both membranes appear similar, but their diverse applications set them apart.
3) Is OEM available?
-Absolutely! We warmly welcome OEM service at any time, tailored to your specific needs.
Please feel free to send us your logo, and we will craft a design for you. Alternatively, you can provide us with your completed design. We will then print it on PE film and ensure it is properly packed before delivering the goods directly to you.
4) Are you a factory?
-Yes, indeed! Shandong Chenhua Waterproof Co., Ltd. is a distinguished factory specializing in a vast array of waterproof materials since 1994. Strategically located in China's renowned Waterproof Town-Taitou, our factory has been consistently catering to diverse waterproofing demands for both unexposed and exposed substrates.
5) What is the delivery time?
-Typically, we complete an order within just 10 days following order confirmation! However, please note that delivery times may vary depending on specific requirements and order quantity, ensuring a seamless and tailored experience.
