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building waterproofing material

How to install the roofing waterproof membrane properly?

There’s no doubt about it, waterproofing is important for protecting your property and its value. The benefits of quality waterproofing include: Protection from leaks and water damage, Strengthening the structure of the building, providing a healthier and safer environment, Reducing maintenance costs, and increasing property value for your family.

Water can cause major damage to buildings. This damage can lead to significant financial loss and safety issues if the foundations are not adequately waterproofed and protected. But it can be prevented with the application of waterproofing membranes. All commercial, industrial, and residential properties benefit from waterproofing membranes.

How to install the roofing waterproof membrane properly?


All buildings in particular benefit much from quality roof insulation and waterproofing. These large buildings undergo a tremendous amount of strain. Many parts are susceptible to leaks. Roofs — especially flat roofs without adequate drainage or concrete roofs — are most vulnerable. Puddles formed on a commercial roof can hasten the degradation of existing waterproofing materials and also compromise the integrity and insulation of the ceiling.


Physically repairing or remodeling the roof is an expensive task, which is why a good solution is to apply waterproof membranes and improve the overall water drainage of the roof. SINOMTC recommends our asphalt-coiled waterproof membrane systems for your roof waterproofing because these products are not affected by ponding or pooling water. However, it’s always recommended to have graded falls to outlets. Concrete roofs are popular in modern architecture, with many residential and commercial properties constructed using this method. Even though concrete is a strong material for roofing, it doesn’t safeguard the property from leaks.


To avoid concrete cancer or other water-related issues on a concrete roof, it is vitally important to install a membrane that is supplied as a complete system. SINOMTC waterproof membrane systems are a pre-formed sheet membrane with a full ancillary range of accessories to complete the entire installation. These membranes will provide long-term protection against the sun and water preventing structural damage.
Here we will try to introduce how to waterproof your roof with our high-quality performance asphalt coiled waterproof membrane system.


SINOMTC bituminous waterproofing membrane is used for reinforced concrete roof waterproofing. This waterproofing membrane comes on-site in the form of rolls manufactured and packed in the factory adequately sealed. The specifications and safety manuals of these membranes provided by SINOMTC should be read before the installation process. Fire safety and prevention are the most important while using this membrane. All inflammable materials from roofs are to be removed and good roofing practices should be followed. The bituminous waterproofing membranes are unfolded on the site and laid firmly on the surface with tar-based adhesives using blowtorches.

sinomtc waterproof material series


A layer of bituminous waterproof membrane is laid over the structural roof which acts as a shield against the seepage of water onto the roof. Roof tiles & membranes are applied over the filler material laid to slope to pass the flow of water into drains. A proper slope is necessary to allow the water to flow steadily to drains. These membranes have 1.5 to 4 mm thick waterproof materials. The membrane should be flexible with an elongation of 150 % to cover any small cracks, strong, chemical & UV-resistant, and flexible enough to take any shape over which it is laid.


Procedure for Roof Waterproofing Using SINOMTC Bituminous Waterproofing Membrane


1. Roof Surface Preparation


The surface to be membrane should be clear from dirt, dry and clean. Must not be installed during adverse weather and below 450 F. For a slope up to 3 inches, the membrane should be laid perpendicular to the slab and a more than 3-inch slope should be laid parallel to the slope. This ensures that water is never running at the joint lap edge.

roof clean before installation waterproof membrane


2. Torch Equipment


Torch equipment should be properly connected and hoses to be in good working condition. Check the equipment against gas leakage by using soapy water. When the torch is opened it should be at the lowest possible setting to avoid a sudden gush of fire.


3. Roll Alignment


No wrinkles should be allowed while laying the membrane and proper alignment is necessary.

roofing waterproof membrane


4. Bituminous Waterproofing Membrane installation


The torch fire should be applied uniformly and slowly over the roll while laying. The best movement of the torch is as shown in the picture.


5. Compound flow out


While torching the membrane on joints, approximately 1 inch of chemicals from the waterproofing membrane should be flowing out to ensure proper filling of gaps. More than 1-inch flow out signals overheating of the membrane. The roller should be laid over joints along with torching so that compound sets appropriately and no hole is created in joints.


6. Check Joints between Waterproofing Sheets


Ensuring a perfect joint between two sheets is the most crucial part. Check all the edges of joints properly to ensure proper adhesion of end laps of the membrane, air gaps are not acceptable. At gaps, the sheets should be lifted and heated with the torch, and resealed again.


7. End Laps in Waterproofing Membrane Sheets


The end of the sheet should be heated properly as bitumen starts appearing over the sheet. Heat the underside of the membrane properly to ensure a proper bond at laps. The bituminous waterproofing membrane sheets are overlapped 3 inches at the sides and 6 inches at the ends for proper grip and waterproof joint and block water seepage. Staggered end laps must be 18 inches apart so that no adjacent end laps coincide


8. Granules Applications


Granules applications match the sheet at the end laps and the roller is spread to set it properly. All applications will give the roof an enhanced professional finish. Read More  Waterproofing Methods Fiber Cement Flat Sheets: Types, Characteristics, and Tests

granules paving

If you have demands, please feel free to contact us by WhatsApp or by mail. Mobile & WhatsApp: +86 18958060375 Email: sino.indutech@gmail.com

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