
Product Introduction
Welcome to the world of Bitumen, a marvel of the construction industry known for its extraordinary waterproofing capabilities. This dense, black, and highly viscous substance, also known as asphalt, is derived from the very essence of petroleum. Its application transcends boundaries, making it the preferred choice for waterproofing an array of surfaces, from roofs and basements to the intricate structures of bridges and other major constructions. With two primary application techniques, Bitumen membranes are a cornerstone in the waterproofing realm.
The two popular methods of application are Torch-on and Self-adhesive.
Torch-on bituminous membranes by CHENHUA offer an adaptable and efficient solution tailored to withstand various weather conditions. Upon application, these membranes transform into a smooth, continuous barrier that bonds securely, ensuring the utmost watertight integrity.
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 the epitome of reliability and strength across a multitude of building grades. They excel in waterproofing and seepage-proofing across both visible and hidden areas, including flat and sloped roofs, subterranean spaces, tunnels, and infrastructure marvels like bridges and parking structures.
Application Method:
1. Substrate Preparation:
Achieve a pristine substrate by ensuring it is immaculately clean, dry, and devoid of any contaminants, setting the stage for flawless application.
Eliminate all dust and any loose materials, leaving no room for errors.
Expose and meticulously repair any blowholes and voids, ensuring structural integrity.
2. Primer Application:
Before membrane application, prime the substrate with care. Utilize a dust catcher or blower for a clean slate, then generously coat with a treatment primer, which optimizes waterproofing and enhances adhesion by consolidating dust.
3. Membrane Placement:
*Unroll the torch-on membrane with precision, aligning it perfectly before embarking on the torching or bonding process.
*Carefully position each membrane in parallel, staggering them by at least 1 meter to prevent joint alignment.
*Ensure end-to-end overlaps are alternated, avoiding alignment in a single line.
*Begin at the lowest slope height, prioritizing areas such as drains and downpipes.
*During application, simultaneously heat both the membrane and substrate, focusing attentively on rolls and overlap regions.
*Skillfully weld overlaps, ensuring a delicate trickle of melted mixture, approximately 1 cm wide, forms along the overlap line.
4.Employ a roller to firmly secure the membrane, ensuring exceptional adhesion and durability.
Important Considerations:
1. Confirm that the substrate is impeccably dry and clean. Avoid installations during rainy or snowy conditions.
2. Operations should be postponed in high winds exceeding grade 5.
3. Construction is not advisable in temperatures below 5°C.
4. If inclement weather such as rain or snow arises during construction, protect the applied membrane without delay.
5. Safety first: all personnel must don designated uniforms during installation, and essential fire control equipment must be at the ready.

Packing and Shipping Guidelines:
1. Store membranes in conditions where dryness and ventilation are optimal.
2. Segregate different membrane types to avoid cross-contamination.
3. Under typical conditions, the recommended storage duration is one year post-production date.
4. During transport, ensure membrane rolls are stored vertically and are shielded from sun and rain exposure.
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 membranes?
- The popular size is 3mm x 1m x 10m, available with either a PE or sand granular top finish.
-Available in a practical and versatile size of 4mm x 1m x 10m, this product comes with your choice of a sleek PE finish or a sophisticated sand granular top.
2) What's the fundamental difference between SBS and APP?
-SBS and APP are exceptional modifiers crafted to elevate the performance of waterproof membranes. SBS modifiers are renowned for enhancing the cold resistance of these membranes, making them perfect for frigid climates. On the other hand, APP modifiers are celebrated for augmenting the heat resistance, ensuring durability and reliability in high-temperature environments. Despite their similar exterior appearances, the functional enhancements they offer are distinct and tailored for specific climate needs.
3) Is OEM available?
-Absolutely. We extend a warm invitation for you to explore our comprehensive OEM services at your convenience.
With just your logo or a complete design, we'll craft a bespoke creation tailored to your brand. We meticulously print it on high-quality PE film, ensuring it is elegantly packaged and safely delivered to your doorstep, enhancing your brand's presence and appeal.
4) Are you a factory?
-Indeed, Shandong Chenhua Waterproof Co., Ltd. stands as a distinguished factory brimming with professional expertise in waterproof materials since 1994. Nestled in the illustrious China Waterproof Town of Taitou, our extensive product range is designed to cater to a multitude of waterproofing applications, both for concealed and exposed surfaces, satisfying diverse project demands.
5) What is the delivery time?
-Typically, our commitment ensures that an order is completed within a streamlined 10-day period following order confirmation. Please be advised that delivery times may adjust based on unique specifications and order volumes to maintain our high standards of quality and service.
