
Product Introduction
Bitumen, commonly referred to as asphalt, is a dense, black, and highly viscous material obtained from petroleum. Renowned for its exceptional waterproofing capabilities, it finds extensive use within the construction industry. Bituminous membranes are perfectly suited for waterproofing tasks across roofs, basements, underground structures, bridges, and numerous other constructions. Primarily, there are two prominent techniques for applying bitumen membranes.
One is the Torch-on method, and the other is Self-adhesive.
Torch-on bituminous membranes offer a versatile and simple solution to tackle all weather conditions. When you apply the CHENHUA membranes, they establish a seamless, watertight barrier that adheres securely 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 various construction grades for waterproofing and seepage-proofing tasks. Suitable for both visible and hidden areas, these include flat roofs, sloped roofs, underground spaces, tunnels, bridges, parking lots, reservoirs, and more.
Application method:
1. Substrate:
Ensure that the substrate is impeccably clean, dry, and free from any contaminants, prepared with the utmost precision.
Eliminate all dust and loose, friable materials thoroughly.
Expose and repair any blowholes and voids completely.
2. Primer:
Before laying the membrane, apply a primer. Clean the substrate with a dust catcher or blower, then thoroughly apply a treatment primer to ensure waterproofing, effective dust consolidation, and improved adhesion.
3. Membrane placement:
*Unroll the torch-on membrane with care and align it precisely before commencing torching or bonding.
*Each membrane must be laid in parallel, staggered by a minimum of 1 meter to prevent coinciding joints.
*Alternate the end-to-end overlaps, ensuring they never align along a single line.
*Begin at the lowest slope height, starting with drains, downpipes, or other features.
*During torching, heat both the membrane and the substrate simultaneously, focusing on the roll and overlapping sections.
*Ensure overlaps are welded meticulously, producing a thin trickle of melted mixture, approximately 1 cm wide, along the overlap line.
4.Use a roller to firmly press down on the membrane surface, ensuring secure adhesion.
Attention:
1. Ensure the substrate is dry and clean. Avoid working on rainy or snowy days.
2. Avoid working when strong winds prevail (above grade 5).
3. Not recommended for construction activities below 5°C.
4. If rain or snow occurs during construction, protective measures for the laid membrane are crucial.
5. Safety during installation is paramount; all personnel must wear special uniforms and have fire control equipment ready.

Packing and shipping:
1. Store membranes in dry, well-ventilated spaces.
2. Keep different membrane types stored separately.
3. Under normal conditions, the storage period is one year from the production date.
4. During transportation, store membrane rolls vertically and protect them 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 with PE or sand granular top.
-Dimensions: 4mm thickness x 1m width x 10m length, available with a choice of PE or sand granular top layer for customized application.
2) What's the fundamental difference between SBS and APP?
-SBS and APP are premium modifiers crafted to elevate membrane performance to new heights. SBS modifiers are renowned for their exceptional enhancement of cold resistance, making them the perfect choice for frigid climates. On the other hand, APP modifiers provide outstanding heat resistance, ensuring durability in sweltering conditions. While they may look alike, their underlying functional enhancements set them apart remarkably.
3) Is OEM available?
-Absolutely. We cordially invite you to explore our exceptional OEM services at your convenience.
Simply present us with your logo, and we'll craft a bespoke design tailored to your specifications. Alternatively, share your completed design, and we will expertly print it on PE film, ensuring it is elegantly packaged before delivering it straight to your location.
4) Are you a factory?
-Indeed, Shandong Chenhua Waterproof Co., Ltd. stands as a distinguished professional factory with extensive expertise in a wide array of waterproof materials since 1994. Nestled in the famed China Waterproof Town - Taitou, our factory boasts a comprehensive product line that meets an extensive range of waterproofing needs, catering to both concealed and exposed substrates with unrivaled precision.
5) What is the delivery time?
-Typically, your order will be completed within a swift 10-day timeframe following order confirmation. Please be aware that delivery times may vary based on specific order requirements and quantities.
