
Product Introduction
Bitumen, commonly known as asphalt, is a viscous, black, and thick liquid or semi-solid derived from petroleum. Renowned for its exceptional waterproofing qualities, it is extensively employed in the construction industry. Bituminous membranes serve as an ideal solution for waterproofing roofs, basements, below-ground structures, bridges, and more. Primarily, there are two distinguished application methods for bitumen membranes.
One method is Torch-on, while the other is Self-adhesive
Torch-on bituminous membranes present an efficient and straightforward solution for year-round use. Once applied, CHENHUA bituminous membranes create a seamless, watertight layer, fully bonded with the substrate ensuring long-lasting 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 are extensively utilized across various building grades for waterproofing and seepage-proofing projects. They are suitable for both exposed and concealed areas such as flat roofs, sloped roofs, underground structures, tunnels, bridges, parking lots, reservoirs, and more.
Application method:
1. Substrate:
Ensure the substrate is impeccably clean, dry, free from any contaminants, and adequately prepared for application.
All dust and loose, friable material must be thoroughly cleared away.
Any blow holes and voids should be fully exposed and then meticulously repaired.
2. Primer:
Prior to membrane application, apply a primer to consolidate dust and enhance adhesion. Use a dust catcher or blower to clean the substrate thoroughly before applying the primer.
3. Membrane placement:
*Unroll and correctly align the torch-on membrane before commencing torching or bonding.
*Each membrane roll should be laid parallel, ensuring a minimum stagger of 1m to prevent joint overlap.
*End-to-end overlaps must be alternated, avoiding alignment along a single continuous line.
*Begin installation at the lowest point of the slope, starting near drains, downpipes, or other critical details.
*When torching, simultaneously heat the membrane and substrate, concentrating on the roll and overlap areas.
*Weld overlaps meticulously until a thin trickle of melted mixture, approximately 1cm wide, emerges along the overlap line.
4.Use a roller to press firmly on the membrane surface, ensuring robust adhesion to the substrate.
Attention:
1. Ensure the substrate is dry and clean. Avoid working during rainy or snowy conditions.
2. Refrain from working in strong winds exceeding 5 on the Beaufort scale.
3. Avoid construction in temperatures below 5°C.
4. In case of rain or snow during construction, implement adequate protective measures for the installed membrane.
5. Safety is paramount. Workers must don specialized protective uniforms during installation, and fire safety equipment should be readily available.

Packing and shipping:
1. Store membranes in dry, well-ventilated conditions to preserve their integrity.
2. Different membrane types must be stored separately to prevent cross-contamination.
3. Under standard conditions, the storage period is one year from the date of production.
4. During transportation, membrane rolls should be positioned vertically and protected from direct sunlight and rainwater exposure.
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 a PE or sand granular top finish
-4mm x 1m x 10m available with a sleek PE or textured sand granular top, offering versatility to your waterproofing needs.
2) What's the difference between SBS and APP?
-SBS and APP are key modifiers enhancing membrane performance. The SBS modifier boosts cold resistance, making it ideal for chilly environments, while the APP modifier enhances heat resistance, perfect for hot climates. Though they appear similar, their applications differ significantly.
3) Is OEM available?
-Yes, indeed! Our OEM service welcomes your partnership at any time.
Simply send us your logo, and our expert team can create a design for you, or provide us with your finished artwork. We will then print it on PE film and wrap it up beautifully before delivering it to your doorstep.
4) Are you a factory?
-Absolutely, 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, we cater to diverse waterproofing needs for both unexposed and exposed surfaces.
5) What is the delivery time?
-Typically, orders are completed within a swift 10 days post-confirmation. However, delivery times may vary based on specific requirements and order quantity, ensuring tailored service for every client.
