Construction steps of roof waterproofing:
1. First, find out the cause of water leakage. It is generally estimated that it is still subsidence. The roof was cast-in-place, and the settlement of the house cracked it, and the rain entered the house.
2, joint repair, the top floor leakage is mostly cracks, gaps need to be filled with joint sealant, and then proceed to the next step after drying.
3. Brush it twice with water-based waterproof coating or transparent waterproof material with wall permeability, which is comprehensive. If the gap is polished, the broadband should reach more than 20 cm. This ensures adhesion. Waterproof coating is permeable and bonded, with good elasticity and long service life.
Extended data:
Experts say: if a house leaks, we must first find out the cause of the leakage. Generally speaking, the following problems are common in roof leakage: cracks caused by quality problems of waterproof layer, cracks caused by aging of waterproof layer, artificial damage of waterproof layer, or structural cracks; The second step is to choose the treatment method. Common treatment methods include: repairing the original waterproof layer, integral waterproofing, etc. The third step is to handle it carefully to avoid future troubles, and remind the owner to choose brand waterproof materials. The construction must be meticulous and comprehensive, and there must be no luck to prevent water leakage again.
In view of the common roof leakage, Leibangshi suggests that you do the following specific steps:
First of all, find the water leak.
If the crack at the water leakage point is not too long or too deep, the length is not more than 5-6cm, and the depth is not more than 2-3cm, it can be filled with Rebonds nozzle grouting material. Leibangshi nozzle grouting material is a cement-based one-component powder grouting material made of high-strength minerals as aggregate, cement as binder and additives with high fluidity, micro-expansion and anti-segregation. It can be used after adding water and stirring during construction. It has the characteristics of good self-flow, high strength, no shrinkage and fast curing, and can quickly fill gaps and solve various anchoring problems such as nozzle and machine foot. It is the latest patented product developed by Leibangshi Company.
Secondly, brush flexible waterproof slurry.
After the nozzle grouting material is filled, apply flexible waterproof slurry. Leibangshi flexible waterproof slurry has the characteristics of "combining rigidity with flexibility", which not only has the extensibility and waterproofing of polymer coating, but also has the advantages of high strength, good water resistance and easy adhesion with wet base. But also has good flexibility, and can resist slight vibration and certain displacement of the building structure;
Thirdly, non-woven fabrics are used to reduce the influence of structural movement on the waterproof layer.
Add a piece of non-woven fabric soaked with flexible waterproof slurry at the crack.
Fourth, make a protective layer of cement mortar.
How to waterproof the roof?
Remove the aging waterproof layer of the roof that needs to be constructed first, and clean the roof surface. Re-basic treatment. 30 thick 1:3 cement mortar leveling, 2% oblique lofting separation joint, ditch position, roof vent, SGF perlite board slope finding, 1: 1 cement mortar jointing detail treatment, cleaning and roof protection. Parapet sink plastic strip 1080, double waterproof drip line, parapet thumbtack with Roman line, fine stone concrete slope. Nodes such as ditches, excellent ditches, parapets and wall-penetrating pipes should be reinforced first. The vertical slope of ditches and eaves gutters shall not be less than 65438 0%, and the gap at the bottom of ditches shall not exceed 200mm. Other important details should be treated with soft treatment and oil seal.
The horizontal layer between the waterproof layer and the structural layer bears the roof design load such as wind, rain and snow, and transmits the construction load of the waterproof layer, so it must have certain strength and hardness. The design of this project should adopt 1:3 cement mortar, and the water membership fee should be strictly controlled during construction, and the consistency and water content should be properly controlled. The moisture content at the grass-roots level should not be lower than 6%. If the moisture content does not meet the requirements, it will have a great influence on the construction quality of waterproof layer. The boxer played an isolated role and broke the bond. In the worst case, the hollow drum is cracked and the waterproof effect is damaged. Therefore, in order to ensure the waterproof effect, the moisture content of the base must be effectively controlled. In addition to instrument measurement, simple methods can also be used for on-site inspection, such as scratches on circular nail tips, which are fast and firm, shallow grooves and white silk marks, indicating that they meet the drying requirements.
Before the waterproof layer construction, the base must be kept clean, and after cleaning, compressed air should be used to blow away the dust in the cracks and internal corners. Oil stains, welding stains, brushes, rust spots, etc. should be cleaned, and the surface method should be kept clean, so that the waterproof coating can effectively penetrate into the cement mortar, strengthen the bonding between the waterproof coating and the base, and improve the waterproof ability. Dismantle the base, clean up the dust and sundries on the surface of the base before construction, and transform the asphalt by hot melting. Before the waterproof layer construction, the nozzle, pipe root, Yin and Yang angle and other details should be made into additional layers. To lay the coiled material, firstly, the thickness of the coiled material should meet the requirements. Cut the waterproof membrane into appropriate sizes, heat the intersection of the base and the coiled material with a flame spray gun, and roll it to the front for pasting as soon as it melts. Tiling the plane to connect the internal coils must be done from bottom to top.
Hot-melt the edge of the cover, heat the coil with a spray gun to lap it, bond it firmly, and then apply the first layer of waterproof coating. Before waterproof construction, the ground should be clean and dry, waterproof coating should be painted completely, without omission, combined with the base, without cracks and bubbles, and the thickness of waterproof coating should meet the product requirements. After the first waterproof coating is completely dried, carry out the second waterproof coating. If the first waterproof coating is not completely dried, the waterproof effect will be greatly reduced if the second waterproof construction is carried out. Protective layer, after the waterproof work is completed, lay a protective layer on the surface to prevent the waterproof layer from being damaged in future construction, and the protective layer package should completely cover the waterproof layer. No omission, firm and hard combination with the base, no foam and falling off. In wastewater test and wastewater test, the height of water should not be less than 2 cm. Then observe for more than 24 hours to see if there is any leakage. Otherwise it can be said to be qualified.
What material is good for roof waterproofing?
Waterproof materials include: flexible mortar, polyurethane, rigid mortar, etc.
The main materials of flexible mortar are emulsion and mortar, which are mixed in a certain proportion and have certain elasticity. The advantage of this material is that even if the base is deformed and cracked, it will not affect the waterproof effect of flexible mortar. But cannot be used as the back surface on the top surface.
Polyurethane basically doesn't pay attention to use. Can be used for indoor and outdoor waterproofing, and has excellent elastic stretching. Basically, no matter which kind of substrate cracks, it will not affect the waterproof effect of polyurethane, and it is also the best waterproof material. However, the disadvantage of polyurethane is that it has a very strong smell.
Hard mortar is also called rigid mortar, and raw materials are emulsion and mortar. But in proportion to the flexible mortar. Therefore, the hard mortar can even be plastered directly after brushing, which is very convenient and there will be no water seepage. The waterproof effect of the back water surface is the best, because its hardness is high, so its elasticity is not good, and it is difficult to ensure that the base will not crack when it is deformed and cracked, so it is generally only used for waterproof of the back water surface.
The best treatment method of roof waterproofing
The best treatment for roof waterproofing is as follows:
1, first find the leaking place, and look for the leaking place from the height of the roof to the lower part, because the water flows to the lower part.
2. Check whether there are cracks in the roof, whether the original waterproof layer is aging, and whether the roofing waterproof coiled material layer is layered and blistered. If it bubbles, it means that water enters the bottom of the waterproof layer, which may easily lead to roof leakage. At the same time, check whether the gutter is blocked. General roof leakage treatment methods include: cleaning the roof, filling joints, sealing joints, finding with mortar and other repair methods.
3. Waterproof construction methods include: waterproof coiled material construction, rigid waterproof coating construction, flexible waterproof coating construction, coating waterproof construction and so on. If there is local leakage, it can be repaired with a plugging king, or it can be used to plug the groove area. The main problems are concentrated in the outlet and upper area of the floor drain surface, which need professional construction master to operate. The joint between water pipe and riser also needs construction.
Preventive measures for roof leakage
1. Before waterproof construction, keep the roof dry. Because the evaporation of roof moisture is not ideal, the newly made waterproof layer bulges, which destroys the waterproof construction effect. Therefore, it is not recommended to construct in rain, snow and early frost weather, and wait until the sun dries the water before construction.
2. Need to choose the appropriate waterproof materials, whether waterproof coiled material or waterproof coating, need to choose materials with quality assurance, and invite professional construction team for on-site maintenance.
3, after the completion of plugging construction, must do closed water test, water storage time is not less than 24 hours, or keep it in the rain for 24 hours.
4, waterproof layer can't have cracks, bulging, peeling, uneven thickness or accumulation, the phenomenon of outcrop.
5. If there is no leakage after the closed water test, it is necessary to restore the insulation layer and waterproof protection layer.