
Product Introduction
Bitumen, commonly recognized as asphalt, is a dense, black, and highly viscous liquid or semi-solid form of petroleum. Renowned for its impeccable waterproofing properties, it is extensively utilized in the construction sector. Bituminous membranes are the ideal solution for waterproofing roofs, basements, below-ground structures, bridges, and a myriad of other structures. There are primarily two distinct methods for applying bitumen membranes.
One is Torch-on, and the other is Self-adhesive.
Torch-on bituminous membranes provide an efficient, easy, and straightforward solution suitable for all seasons. Once applied, CHENHUA bituminous membranes form a thin, impenetrable layer of watertight material that bonds seamlessly 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 Membrane is extensively utilized across various levels of building waterproofing and seepage-proofing projects, applicable to both exposed and concealed areas, including flat roofs, sloped roofs, underground structures, tunnels, bridges, parking lots, reservoirs, and more.
Application method:
1. Substrate:
Ensure the substrate is pristine, dry, free from contaminants, and well-prepared.
All dust and loose friable materials must be completely cleared.
Blow holes and voids should be fully revealed and subsequently repaired.
2. Primer:
Apply the primer before laying the membrane, ensuring the substrate is dust-free using a dust catcher or blower; then coat thoroughly with a treatment primer for optimal dust consolidation and superior adhesion.
3. Membrane placement:
*Unroll the torch-on membrane and align it precisely before proceeding with torching or bonding.
*Position each membrane in parallel alignment, maintaining at least a 1-meter stagger to prevent coinciding joints.
*End-to-end overlaps should be alternated, never aligned along a single line.
*Begin installation from the lowest point of the slope, focusing on drains, downpipes, or other specific details.
*During the torching process, heat both the membrane and the substrate simultaneously, concentrating on the roll and the overlaps.
*Meticulously weld the overlaps until a small bead of melted mixture, approximately 1 cm wide, appears along the overlap line.
4.Use a roller to firmly press the membrane surface, ensuring a secure bond.
Attention:
1. Ensure the substrate is dry and clean. Avoid working in rainy or snowy conditions.
2. Refrain from working in high winds (above 5 grade).
3. Not suitable for construction below 5°C.
4. If rain or snow occurs during construction, protective measures for the laid membrane are essential.
5. Workers must wear specialized uniforms for safety during installation. Fire control equipment is necessary.

Packing and shipping:
1. Store membranes in dry, well-ventilated conditions.
2. Different membrane types should be stacked separately.
3. Under normal conditions, the storage period is one year from the production date.
4. During transportation, membrane rolls should be positioned vertically, away 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 is the popular size for Torch on bitumen membrane?
- 3mm x 1m x 10m with PE or sand granular top
- 4mm x 1m x 10m with PE or sand granular top
2) What's the difference between SBS and APP?
- SBS and APP are specialized modifiers designed to enhance the performance of waterproof membranes. The SBS modifier is specifically formulated to boost cold resistance, making it the ideal solution for regions with frigid climates. On the other hand, the APP modifier excels in increasing heat resistance, perfect for areas exposed to high temperatures. While these two modifiers offer distinct advantages, their appearances remain quite similar, ensuring a consistent look across applications.
3) Is OEM available?
- Absolutely. We warmly welcome OEM services at any time to meet your specific branding needs.
Please provide your logo, and we will create a design for you, or you can send us your completed design directly. We then proceed to print it on PE film and carefully package it before delivering the goods to you.
4) Are you a factory?
- Yes, Shandong Chenhua Waterproof Co., Ltd. is a seasoned professional factory specializing in a wide array of waterproof materials since 1994. Located in the renowned China Waterproof Town - Taitou, our factory is dedicated to meeting diverse waterproofing demands for both unexposed and exposed substrates.
5) Delivery time
- Typically, an order is completed within 10 days following order confirmation. However, delivery times may vary based on specific requirements and order quantities, ensuring we cater to your unique needs efficiently.
