
Product Introduction
Bitumen, recognized as asphalt, is a dense, black, and highly viscous material derived from petroleum. Renowned for its exceptional waterproofing capabilities, it sees widespread application in construction projects. Bituminous membranes are the ideal solution for waterproofing roofs, basements, below-ground structures, bridges, and many other infrastructures. This versatile material primarily employs two distinct methods of application.
These methods include the Torch-on technique and the Self-adhesive method.
Torch-on bituminous membranes offer an efficient, user-friendly, and reliable solution suitable for all climates. Upon application, CHENHUA bituminous membranes form a seamless, watertight layer that adheres firmly to the surface, ensuring ultimate protection.
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 find extensive application in a variety of construction and seepage prevention projects across different environments. They are perfect for both visible and concealed areas, including flat and slope roofs, underground spaces, tunnels, bridges, parking lots, reservoirs, and more.
Application method:
1. Substrate Preparation:
Ensure that the substrate is immaculate, devoid of moisture, and free from any contaminants, having been correctly prepared.
All dust and loose materials must be thoroughly eliminated.
Blow holes and voids should be completely exposed and subsequently repaired for optimal results.
2. Primer Application:
Apply a primer before installing the membrane. Clean the substrate thoroughly using a dust catcher or blower; then apply a comprehensive treatment primer to enhance waterproofing, ensuring dust consolidation and superior adhesion.
3. Membrane Placement:
*Unroll the torch-on membrane and accurately align it before proceeding with torching or bonding.
*Lay each membrane parallel to its neighbor, ensuring they are staggered by at least 1 meter to prevent coinciding joints.
*End-to-end overlaps must always be alternated, avoiding alignment along a single line.
*Commence installation from the lowest part of the slope, focusing on areas with drains, downpipes, or other key details.
*The torching process must simultaneously heat the membrane and the substrate, concentrating on the roll and overlapping sections.
*Meticulously weld the overlaps until a small, 1 cm wide trickle of melted mixture is visible along the overlap line.
4. Finalization:Employ a roller to apply firm pressure on the membrane surface, ensuring it adheres securely.
Attention:
1. Ensure the substrate remains dry and clean at all times. Avoid working on rainy or snowy days.
2. Refrain from construction activities in conditions with strong winds (exceeding grade 5).
3. Construction is not advisable at temperatures below 5°C.
4. In case of rain or snow during construction, it is imperative to protect the already laid membrane.
5. All personnel must wear specialized safety uniforms during installation. Appropriate equipment for fire safety is essential.

Packing and Shipping:
1. Store membranes in dry, well-ventilated areas to maintain optimal condition.
2. Segregate different membrane types for storage.
3. Under standard conditions, membranes can be stored for up to one year from the production date.
4. During transportation, position membrane rolls vertically, ensuring they are shielded from 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 available with a PE or sand granular top
-4mm x 1m x 10m available with a PE or sand granular top
2) What's the difference between SBS and APP?
- SBS and APP act as exceptional modifiers that enhance the performance of waterproof membranes. The SBS modifier boosts the cold resistance, making it ideal for chilly environments, while the APP modifier increases heat resistance, perfect for warmer climates. Despite their distinct functionalities, their physical appearances remain virtually identical.
3) Is OEM available?
- Yes, our OEM service is always warmly welcomed. We are here to bring your unique vision to life at any time.
Simply send us your logo, and we will craft a bespoke design for you, or feel free to provide us with your completed design. We will print it on PE film and meticulously package it before dispatching your products.
4) Are you a factory?
- Yes, Shandong Chenhua Waterproof Co., Ltd is a highly professional factory specializing in a wide array of waterproof materials since 1994. Nestled in China's renowned Waterproof Town - Taitou, our products are designed to meet diverse waterproofing needs for both unexposed and exposed surfaces.
5) What is the delivery time?
- Typically, an order is completed within 10 days post-confirmation. However, delivery times may vary based on specific requirements and order quantities.
