Waterborne (951) polyurethane waterproof coating is a new type of waterproof material encouraged by the country. Due to its excellent performance, simple construction, good waterproof effect, and long service life, it has been widely used in various waterproof and anti-seepage projects.

Many people may not be familiar with the specific construction steps of this waterproof coating, so today we will learn together.

According to the standards in the "Technical Specification for Roofing Engineering":

Firstly, grassroots treatment must be carried out: the grassroots must be flat, firm, clean, free of visible water, and the internal and external corners must be made into a circular arc shape. The old roof should be cleaned of any cracked or bulging waterproof materials and dust, and any low-lying or damaged areas should be leveled. Leak proof areas should be sealed first, and the base layer should be flat without any visible water. Special areas such as water outlets and separation joints should first undergo flexible sealing treatment. The painting procedure generally starts with the internal and external corners, in the vertical plane, and then proceeds with large-scale construction.

Bottom coat construction: Mix water and paint in a 1:3 weight ratio, stir evenly before use. The use of primer can improve the permeability of the coating to the base layer and enhance the bonding strength.

Coating application: The construction can be carried out by rolling, scraping, or brushing methods. It is recommended to use the thin layer multiple coating method, and each coating should not be too thick. Generally, it is divided into 3-4 coats, with a total thickness of about 1.5-2.0mm. After the coating dries and forms a film, the next coat of coating can be applied. Weak links should be reinforced with tire body materials.

After each coating is dry, a construction quality inspection should be carried out. If there are any omissions or bulges, they should be repaired.

Attention: Before construction, the paint should be thoroughly mixed evenly, and water should not be added randomly except for the primer. It is strictly prohibited to carry out construction below 5 ℃ or in rainy, snowy and frozen weather. Before the coating is fully dried, no other work should be carried out on the layer to avoid damaging the protective layer and affecting the waterproof effect.

That's all for today's sharing. If you want to learn more about waterproofing knowledge, please stay tuned for my next sharing. Follow me, don't get lost, and don't miss out on more valuable information!