
Product Introduction
Bitumen, traditionally known as asphalt, is a distinctive, sticky, black, and highly viscous liquid or semi-solid that is derived from petroleum. Celebrated for its remarkable waterproofing capabilities, bitumen is a staple in the construction industry. Bituminous membranes are the ideal solution for waterproofing a myriad of structures including roofs, basements, below-ground structures, bridges, and more. There are two primary application methods for these versatile bitumen membranes.
The methods include: Torch-on and Self-adhesive applications.
Torch-on bituminous membranes offer an unparalleled, efficient, and effortless solution for year-round waterproofing needs. When applied, CHENHUA bituminous membranes transform into a seamless, impervious layer, meticulously bonded to the surface, 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 find widespread use across a spectrum of building waterproofing and seepage-proofing projects, catering to both exposed and concealed areas. They are employed in projects such as flat roofs, sloped roofs, underground structures, tunnels, bridges, parking lots, reservoirs, and more.
Application Method:
1. Substrate Preparation:
Ensure the substrate is impeccably clean, dry, free from contaminants, and appropriately prepared.
Eliminate all dust and any loose, friable material thoroughly.
Expose and repair any blow holes and voids completely.
2. Primer Application:
Before membrane installation, apply a primer meticulously. Clean any dust on the substrate using a dust catcher or blower; then, apply a comprehensive coat of treatment primer to ensure optimal dust consolidation and superior adhesion.
3. Membrane Placement:
*Unroll the torch-on membrane and align it precisely before torching or bonding.
*Position each membrane parallel to the next, ensuring a stagger of at least 1 meter to prevent coinciding joints.
*Stagger end-to-end overlaps alternately, avoiding alignment along a single line.
*Initiate the process from the lowest slope point, focusing on areas with drains, downpipes, or specific details.
*During torching, heat both the membrane and substrate simultaneously, concentrating efforts on the roll and overlap regions.
*Weld the overlaps meticulously until a thin trickle of melted material, approximately 1 cm wide, emerges along the overlap line.
4.Employ a roller to firmly press the membrane surface, ensuring robust adhesion.
Attention:
1. Ensure the substrate is dry and clean. Avoid work during rain or snow.
2. Refrain from working in strong winds (above 5 grade).
3. Construction is unsuitable below 5°C.
4. In case of rain or snow during construction, implement protective measures for laid membranes.
5. Workers must wear specialized uniforms for safety. Fire control equipment is essential.

Packing and Shipping:
1. Store membranes under dry and well-ventilated conditions.
2. Segregate storage of different membrane types.
3. Under normal conditions, storage is viable for up to one year post-production.
4. During transport, position membrane rolls vertically, away from direct 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 popular size for Torch-on bitumen membranes?
- 3mm x 1m x 10m with PE or sand granular top.
- 4mm x 1m x 10m with PE or sand granular top.
2) What sets SBS and APP apart?
- SBS and APP serve as crucial modifiers that enhance the performance of waterproof membranes. The SBS modifier is adept at boosting cold resistance, making it ideal for use in chilly environments. Conversely, the APP modifier excels in enhancing heat resistance, perfect for hotter climates. While their appearances are quite similar, these modifiers impart distinct properties that cater to specific environmental needs.
3) Is OEM service available?
- Absolutely! Our OEM service is always ready to accommodate your needs.
Simply provide us with your logo, and we will craft a design for you, or you're welcome to submit a completed design. This design will then be printed on the PE film and packaged before we dispatch your order.
4) Are you a factory?
- Indeed, Shandong Chenhua Waterproof Co., Ltd. is a seasoned manufacturer specializing in a diverse array of waterproof materials since 1994. Nestled in China's renowned Waterproof Town, Taitou, our factory is equipped to meet various waterproofing demands for both concealed and exposed surfaces.
5) What is your delivery timeline?
- Typically, an order is completed within 10 days following confirmation. However, delivery timelines may vary based on specific requirements and order quantities.
