Roof waterproofing

In our country’s housing survey, 35% of the total number of random inspections were found to have different degrees of roof leakage. . House leakage directly affects the use of houses and user safety, and also causes certain economic losses to the country. Therefore, roof waterproofing works are very necessary, and the improvement of the quality of roof waterproofing construction is conducive to improving the living and working environment. Let’s learn about the knowledge of roof waterproofing.

Roofing waterproofing practices. General roofing construction procedures: acceptance leveling layer→cleaning the base layer→preparing cement adhesive→making additional layer→base layer construction→protection layer→maintenance. Before laying and bonding the roof waterproofing membrane, pre-spread the roofing waterproofing membrane, align it, then fold the two ends of the roofing waterproofing membrane and roll it up, pour the prepared cement adhesive onto the base layer, and use a scraper Scrape it evenly, then push the roofing waterproof membrane forward, and use a scraper to remove the air left in the roof waterproofing membrane in time to scrape out the excess adhesive. The bonding rate of roofing waterproof coiled material and leveling layer is ≥85%. Coil indirect seam method
⑴ Roofing waterproof joint construction: The vapor barrier, waterproof layer and additional layers are all lap joints, bonded with cement adhesive, and the width is 10cm. The seam of the additional layer and the seam of the waterproof layer are staggered by more than 5cm. ⑵The lap width of roof waterproofing membrane is 8-10cm on the long side and 10-15cm on the short side. The joints of adjacent short sides should be staggered by more than 100cm, and the angle between the wall and the ground should be more than 30cm. After the roof waterproof protective layer is laid and glued, it needs to be done on the waterproof layer
1:2.5 The protective layer of cement mortar with a thickness of 2cm is divided into two parts. The stubble of the second layer must be staggered by more than 20cm. The protective layer must be flat and sprayed for curing. Precautions for roof waterproofing 1. It is forbidden to construct under 5℃ or when it is raining. 2. If the construction is in a particularly humid and ventilated environment, ventilation equipment should be used to speed up the film formation of the waterproof coating, so as not to affect the quality of the waterproof layer; 3. Do not mix the dried mortar with water before using; 4. Node treatment According to relevant specifications, it is recommended to add a layer of glass fiber mesh; 5. Within 24 hours after the slurry is applied, it is necessary to prevent people from walking and not wearing high heels or spiked shoes to enter the waterproof layer area. 6. Before the completed waterproof layer is used as a protective layer, no iron, steel nails, steel bars, scaffolding and other angular and heavy objects shall be constructed or stacked on the waterproof layer to avoid damage to the waterproof layer; 7. After the waterproof layer is completely dried, Only use other covering layers; 8. Take protective measures, such as wearing gloves, etc.
1. The yin and yang corners of the base layer at all waterproof construction sites should be chamfered with R=5cm, and they should be neat and smooth. 2. Before laying the coiled material, the waterproof leveling layer must be clean and dry. Simple inspection method for the degree of dryness of the leveling layer: Lay 1m2 of the coiled material flat and dry on the leveling layer, let it stand for 3~4h, and open it for inspection. The covered part of the leveling layer and the coil can be laid without watermark. 3. When the roof waterproof layer is constructed, attention must be paid to the nodes, additional layers, and the areas where roof drainage is concentrated (the connection between the roof and the gutter, eaves, gutters, flooding, roof corners, deformation joints, etc., roofing pipes ), the sealing treatment of the end of the façade coil receiving head shall not be warped. At the same time, an additional layer should be made at the junction of the plane and the elevation, and the additional layer is 500mm. 4. The slope within the diameter of 500mm around the roof drainage drop should be increased separately, generally reaching more than 5%, to prevent the slope from being too small and easy to accumulate water.