
Product Introduction
Bitumen, renowned in the industry as asphalt, is a robust, black, and highly sticky liquid or semi-solid derived from petroleum. Praised for its superior waterproofing capabilities, it is a cornerstone of the construction industry. Bituminous membranes are the go-to solution for waterproofing a wide array of structures, including roofs, basements, underground edifices, bridges, and many more. There are two predominant methods for applying these bitumen membranes.
The first is the Torch-on method, complemented by the Self-adhesive technique.
Torch-on bituminous membranes provide a highly adaptable and effortless solution suitable for any weather condition. Once our CHENHUA membranes are installed, they create a seamless, watertight shield that is firmly affixed 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 widely employed across diverse construction standards for waterproofing and seepage-proofing projects. Whether for exposed or concealed sections, they are perfect for flat roofs, sloped roofs, subterranean areas, tunnels, bridges, parking structures, reservoirs, and beyond.
Application Methodology:
1. Substrate Preparation:
Ensure the substrate is spotlessly clean, thoroughly dry, and completely free from any contaminants, prepared to meet the highest standards.
All dust and loose materials must be meticulously removed.
Blowholes and void spaces should be fully exposed and appropriately repaired.
2. Primer Application:
Precede membrane application with a primer. Cleanse the substrate utilizing a dust catcher or blower, and apply a comprehensive primer coat to ensure optimal waterproofing, cementing dust firmly in place, and enhancing adhesion.
3. Membrane Installation:
*Gently unroll the torch-on membrane and align it with precision before beginning the torching or bonding process.
*Each membrane sheet should be installed in parallel, offset by at least one meter to avoid overlapping joints.
*End-to-end overlaps must be staggered, avoiding alignment along a single line.
*Start at the lowest slope, prioritizing areas like drains, downpipes, or similar details.
*During torching, simultaneously heat both the membrane and substrate, with a focus on the roll and overlap areas.
*Accurate welding of overlaps is crucial, ensuring a fine line of melted mixture, roughly 1 cm wide, appears along the joint.
4. Final Pressing:Use a roller to apply firm pressure on the membrane surface, ensuring secure and lasting adhesion.
Important Considerations:
1. The substrate must be dry and clean. Avoid operations in rainy or snowy weather.
2. Cease work during strong winds (above grade 5).
3. Not advisable for construction in temperatures below 5°C.
4. Should rain or snow occur during construction, protective measures for the installed membrane are imperative.
5. All workers must wear specialized uniforms for safety, and fire control equipment is a must.

Packaging and Transportation:
1. Store membranes in dry, well-ventilated spaces.
2. Separate storage for different membrane types is necessary.
3. Under typical conditions, the storage duration is one year from the production date.
4. During transportation, membrane rolls should be stored upright and 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 is the preferred size for Torch-on bitumen membrane?
-3mm x 1m x 10m with a protective PE or sand granular top.
-4mm x 1m x 10m with a protective PE or sand granular top.
2) What's the fundamental difference between SBS and APP?
-SBS and APP are specialized modifiers designed to enhance membrane performance. SBS modifiers significantly improve the cold resistance of waterproof membranes, perfect for chilly environments. Meanwhile, APP modifiers bolster the heat resistance of waterproof membranes. Despite their similar appearance, the functional enhancements they provide are distinct and substantial.
3) Is OEM available?
-Absolutely. We warmly welcome you to explore our bespoke OEM services at any time, tailored to meet your unique needs.
Simply provide us with your logo, and we can create a bespoke design for you, or feel free to send us your completed design. We will then print it on superior PE film and ensure it's elegantly packaged to perfection before delivering the goods to your doorstep.
4) Are you a factory?
-Indeed, Shandong Chenhua Waterproof Co., Ltd. is a seasoned professional factory specializing in an array of exceptional waterproof materials since 1994. Our esteemed establishment is located in the renowned China Waterproof Town -- Taitou. Our diverse product range satisfies various waterproofing needs for both hidden and exposed substrates.
5) What is the delivery time?
-Typically, an order is completed within a swift 10 days following order confirmation. Please note that delivery times may vary depending on specific requirements and order quantities, ensuring we meet your individual needs.
