
Product Introduction
Bitumen, often referred to as asphalt, is a highly adhesive, black, and ultra-viscous liquid or semi-solid derivative of petroleum. Due to its exceptional waterproofing properties, it has become a staple in construction projects. Bituminous membranes are the epitome of waterproofing solutions for roofs, basements, subterranean structures, bridges, and a plethora of other constructions. Primarily, there are two prevalent application techniques for bitumen membranes.
The first method is Torch-on, while the second is Self-adhesive.
Torch-on bituminous membranes represent an excellent, straightforward, and user-friendly solution for year-round waterproofing. Once expertly applied, CHENHUA's bituminous membranes transform into a thin, impermeable barrier that seamlessly bonds to the surface, ensuring 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 a myriad of building waterproofing and seepage-proofing endeavors, suitable for both exposed and concealed areas like flat roofs, sloped roofs, subterranean settings, tunnels, bridges, parking lots, reservoirs, and more.
Application method:
1. Substrate:
Ascertain that the substrate is impeccably clean, thoroughly dry, devoid of contaminants, and meticulously prepared for application.
All dust and loose, friable materials must be meticulously eradicated.
Ensure blow holes and voids are completely exposed, then proceed with necessary repairs.
2. Primer:
Before membrane application, apply a primer. Use a dust catcher or blower to cleanse the substrate, then uniformly coat with waterproofing treatment primer to consolidate dust and enhance adhesion.
3. Membrane placement:
*Unroll the torch-on membrane, ensuring perfect alignment prior to torching or bonding.
*Each membrane should be aligned parallel, staggered by a minimum of 1 meter to avoid joint coincidence.
*End-to-end overlaps must always alternate and never align along a singular line.
*Commence from the lowest point of the slope, focusing on drains, downpipes, and additional details.
*When torching, simultaneously heat both the membrane and substrate, concentrating on the roll and its overlap.
*Ensure overlaps are meticulously welded until a visible trickle of melted mixture, approximately 1 cm wide, emerges along the overlap line.
4.Employ a roller to exert firm pressure on the membrane surface, guaranteeing a secure and steadfast bond.
Attention:
1. Ensure the substrate remains dry and pristine. Refrain from working in rainy or snowy conditions.
2. Avoid working under strong winds exceeding grade 5.
3. Construction is inadvisable in temperatures below 5°C.
4. If rain or snow intervenes during construction, ensure protective measures are in place for the laid membrane.
5. Workers must wear specialized uniforms for safety during installation. Fire control equipment is essential.

Packing and shipping:
1. Store membranes in dry, well-ventilated environments.
2. Segregate different types of membranes when stacking.
3. Typically, the storage period is up to one year from the production date.
4. During transport, position membrane rolls vertically, keeping them 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's the popular size for Torch on bitumen membrane?
-3mm x 1m x 10m, available with a PE or sand granular top
-4mm x 1m x 10m, available with a PE or sand granular top
2) What's the difference between SBS and APP?
- SBS and APP are exceptional modifiers designed to enhance the performance of waterproof membranes. SBS modifier significantly boosts cold resistance, making it ideal for applications in chilly environments. On the other hand, APP modifier elevates heat resistance, providing optimal performance in warmer regions. Although they appear similar, their functionalities cater specifically to different climatic needs.
3) Is OEM available?
- Yes, our OEM service is warmly welcomed at any time.
Please send us your logo, and we will craft a design for you. Alternatively, you can forward your completed design directly to us. We will then print it on PE film and expertly package it before delivering your goods.
4) Are you a factory?
- Yes, Shandong Chenhua Waterproof Co., Ltd. is a professional factory specializing in a wide range of waterproof materials since 1994. Located in China's renowned Taitou Waterproof Town, our factory is dedicated to meeting diverse waterproofing needs for both unexposed and exposed substrates.
5) What is the delivery time?
- Typically, an order is completed within 10 days post order confirmation. Please note that delivery times may vary depending on specific requirements and order quantities.
