
Product Introduction
Bitumen, frequently known as asphalt, is a sticky, black, and highly viscous liquid or semi-solid form derived from petroleum. Celebrated for its outstanding waterproofing capabilities, it is extensively utilized across the construction sector. Bituminous membranes serve as an ideal solution for waterproofing roofs, basements, below-ground structures, bridges, and a plethora of other structures. The application of bitumen membranes generally employs two primary methods.
One is Torch-on, and the other is Self-adhesive
Torch-on bituminous membranes deliver unmatched efficiency, bringing ease and simplicity to any seasonal undertaking. Once installed, CHENHUA bituminous membranes act as a robust, seamless layer of watertight material, expertly bonded 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 highly versatile, making them suitable for a range of building waterproofing and seepage-proofing projects. They excel in both exposed and unexposed areas, such as flat roofs, sloped roofs, underground spaces, tunnels, bridges, parking lots, reservoirs, and more.
Application method:
1. Substrate Preparation:
Ensure the substrate is meticulously clean, dry, and free from all impurities, with proper preparation being key to success.
All dust and loose, friable materials must be thoroughly removed.
Any blowholes and voids should be fully exposed and subsequently repaired to ensure a smooth surface.
2. Primer Application:
Apply a primer before laying the membrane. Clean the substrate's dust using a dust catcher or blower; then, apply a comprehensive treatment primer to consolidate dust and enhance adhesive performance.
3. Membrane Placement:
*Unroll the torch-on membrane and align it properly before proceeding with torching or bonding.
*Each membrane must be placed parallel to others and staggered by at least 1 meter to prevent coinciding joints.
*The end-to-end overlaps should alternate and never align along a single line.
*Installation should commence at the lowest slope height, incorporating drains, downpipes, and other detailed areas.
*When torching the rolls, heat both the membrane and the substrate simultaneously, focusing on the roll and overlapping areas.
*Pay careful attention when welding overlaps to create a visible trickle of melted mixture, approximately 1 cm wide, emerging along the overlap line.
4. Final Touches:Employ a roller to exert pressure on the membrane surface to ensure a firm and lasting adhesion.
Attention:
1. The substrate must remain dry and clean. Avoid working in rainy or snowy conditions.
2. Refrain from working under strong winds (above 5-grade).
3. Construction is inadvisable in temperatures below 5°C.
4. Should rain or snow occur during construction, it's imperative to protect the laid membrane.
5. Workers must wear specialized uniforms for safety during installation. Proper fire control equipment is essential.

Packing and Shipping:
1. Store membranes in dry, well-ventilated conditions to maintain their quality.
2. Different membrane types should be stored separately to prevent any mix-ups.
3. Typically, the storage period extends to one year from the production date.
4. During transportation, membrane rolls should be positioned vertically and shielded from sunlight and rainwater.
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 membrane?
- 3mm x 1m x 10m, available with either PE or sand granular top
- 4mm x 1m x 10m, also available with PE or sand granular top
2) What's the difference between SBS and APP?
-SBS and APP serve as essential modifiers to enhance the performance of waterproof membranes. SBS modifiers bolster cold resistance, making them ideal for chilly environments. APP modifiers, conversely, augment hot resistance. While their appearances are similar, the choice between them depends on the specific environmental challenges you face.
3) Is OEM available?
-Absolutely! We warmly welcome any OEM service requests, anytime you need.
Please send us your logo, and we will design it for you. Alternatively, you can provide us with your completed design directly. We will then print it on PE film and package your goods before delivering them securely to your doorstep.
4) Are you a factory?
-Yes, indeed! Shandong Chenhua Waterproof Co., Ltd. is a professional manufacturer specializing in a wide range of waterproof materials since 1994. Situated in China's renowned Waterproof Town of Taitou, our factory produces products that cater to diverse waterproofing needs for both exposed and unexposed substrates.
5) What is the delivery time?
-Typically, an order is completed within 10 days of order confirmation. However, delivery times may vary depending on specific requirements and order quantities, ensuring we meet your unique needs with precision and care.
