
Product Introduction
Bitumen, also known as asphalt, is a robust, black, and highly viscous liquid or semi-solid derived from petroleum. Renowned for its extraordinary waterproofing capabilities, it plays a vital role in the construction industry. Bituminous membranes are the go-to solution for waterproofing roofs, basements, underground structures, bridges, and more. There are primarily two application techniques for these membranes.
The first is the Torch-on method, while the second is Self-adhesive.
Torch-on bituminous membranes provide a flexible and uncomplicated solution for all weather conditions. Once the CHENHUA membranes are applied, they create a seamless, watertight barrier, securely bonding 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 used across various construction grades for waterproofing and seepage-proofing projects. They are suitable for both exposed and concealed areas, including flat roofs, sloped roofs, underground spaces, tunnels, bridges, parking lots, reservoirs, and more.
Application Method:
1. Substrate:
Ensure the substrate is immaculately clean, dry, and free from any contaminants, prepared with precision.
All dust and loose, friable materials must be completely removed.
Blowholes and voids should be fully exposed and then meticulously repaired.
2. Primer:
Apply a primer before laying the membrane. Clean the substrate using a dust catcher or blower, then coat thoroughly with a treatment primer to ensure waterproofing, promoting effective dust consolidation and enhanced adhesion.
3. Membrane Placement:
*Carefully unroll the torch-on membrane, aligning it precisely before beginning the torching or bonding process.
*Each membrane should be laid in parallel, staggered by at least 1 meter to avoid joints coinciding.
*End-to-end overlaps should be alternated, never aligned along a single line.
*Always start at the lowest slope height, beginning with drains, downpipes, or other details.
*During torching, simultaneously heat both the membrane and the substrate, focusing on the roll and overlap areas.
*Overlaps must be welded with precision, ensuring a thin trickle of melted mixture, about 1 cm wide, appears along the overlap line.
4.Use a roller to press down the membrane surface firmly, ensuring secure adhesion.
Attention:
1. Ensure the substrate is dry and clean. Avoid operations on rainy or snowy days.
2. Avoid work in strong winds (above grade 5).
3. Not suitable for construction below 5°C.
4. If rain or snow occurs during construction, protective measures for the laid membrane are crucial.
5. All personnel must wear special safety uniforms during installation. Fire safety equipment is essential.

Packing and Shipping:
1. Store membranes in dry, well-ventilated areas.
2. Different membrane types must be stored separately.
3. Under normal conditions, the storage period is one year from the date of production.
4. Membrane rolls should be stored vertically during transportation and protected 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, 1m width, and 10m length with options of either a sleek PE finish or a classic sand granular top.
2) What's the fundamental difference between SBS and APP?
-SBS and APP are premium modifiers engineered to elevate the performance of waterproof membranes. SBS is renowned for enhancing cold resistance, making it perfect for frigid environments. In contrast, APP excels in boosting heat resistance, ensuring enduring protection in hotter climates. Though they share a similar appearance, their unique functional benefits set them apart.
3) Is OEM available?
-Absolutely. We cordially invite you to take advantage of our exceptional OEM services whenever you wish.
Simply provide your logo, and we will craft a custom design tailored to your brand, or submit your finished design for us to bring to life. We will print it on high-quality PE film, package it with elegance, and deliver it directly to your specified location.
4) Are you a factory?
-Indeed, Shandong Chenhua Waterproof Co., Ltd. is a distinguished professional factory, passionately dedicated to producing superior waterproof materials since 1994. Nestled in the esteemed China Waterproof Town -- Taitou, our extensive product range caters to a myriad of waterproofing requirements, whether for hidden or exposed surfaces.
5) What is the delivery time?
-On average, orders are completed within 10 days after confirmation. However, please note that delivery times can vary depending on specific order requirements and quantities.
