Roof waterproof mending leakage construction steps and materials
With the construction of roof waterproofing and plugging leaks, with the increase in the number of years of use, many building constructions will leak. It is particularly important to understand certain waterproofing of roofs, otherwise we will choose a lot of inconveniences in our lives. Before the construction of the waterproof layer, the dust, sand, gravel, debris, oil and mortar on the base must be removed.
For many homeowners living on the top floor, the waterproofing of the roof is a very important part of the renovation process. Therefore, we need to understand some of the knowledge about the roof waterproofing and repairing steps in order to avoid inconvenience in the construction process.
1. The cement mortar screed must be lined or marked for slopes according to the design requirements, and a separate grid strip must be installed. After the cement mortar is leveled and closed, it should be calendered twice to make the surface smooth and dense and fully maintained. The round corner of the roof requires a round trowel to wipe out the arc, and the screed layer within the 50 cm diameter range around the water fall should be wiped into a concave shape. pit.
2. Separation seams can be completely disconnected, and the upper part can also be 1/2 split, the lower part is not broken, sub-grid seams filled with sealing material.
3. Before the construction of the waterproof layer, dust, sand, gravel, debris, oil and mortar must be removed from the ground.
4. When there are high and low spans, the construction of the waterproof layer shall be constructed in accordance with the principle of first high and low, and in the same span, the principle of first and long distance shall be followed, starting from the lowest point.
5. Before the construction of the waterproof layer of coating film, the degree of dryness of the base layer must be tested. During the test, the lm2 waterproofing membrane or plastic film shall be laid flat on the screeding layer, and then the inspection shall be lifted after standing for 3-4 hours. The leveling layer covering part and the waterproofing volume shall be checked. No watermark on the material or plastic film can be applied.
6. Before the large-area coating construction, additional strengthening treatment should be performed on water fall-off, yin and yang angles, gutters, and cornices.
7. The thickness of the synthetic polymer waterproof coating film should be greater than or equal to 2miD_, the modified bitumen waterproof coating should be greater than or equal to 3mm, and the bitumen-based waterproof coating film should be greater than or equal to 8mlTl.
8. Waterproof coating should be divided into brushing. Brushing should wait until the first coating is dried and filmed before painting the coating again. The direction of brushing is perpendicular to the previous one.
9. When the waterproof layer is applied to the corners and facades, it should be re-coated several times, and there should be no runny or accumulation phenomenon.
10. The inner side of the parapet wall and the top of the roof must be waterproofed according to design and specifications.
11. When cement mortar, block or fine stone concrete is used as a protective layer, the coating film shall be completely dried, and after the isolation layer is applied, cement mortar or fine stone concrete may be applied. Mortar or fine stone concrete should be calendered and divided according to requirements. Separation grid spacing should not be greater than 6m, seam width of 10mm, and sealed with sealing material embedded.
What are the waterproof sealing materials for roof?1. SBS modified bitumen waterproof membrane for roof waterproofing and trapping materials
SBS modified bitumen membrane is made of SBS rubber modified petroleum bitumen as the infiltrating cover layer. It is made of polyester fiber non-woven fabric, yellow linen, glass fiber felt, etc. as the base of the tire, and the plastic film is used for anti-sticking and isolation. Layers, processed by the selection of materials, ingredients, eutectic, infiltration, composite molding, curling and other processes. The coil has excellent high temperature resistance and can be used within the temperature range of -25 to +100°C, has high elasticity and fatigue resistance, and has an elongation of up to 1500% and strong resistance. Puncture ability, tear resistance. Suitable for waterproof construction in cold areas, as well as industrial and civil buildings with large deformation and vibration. Widely used in industrial and civil construction roof, basement, bathroom and other waterproof projects and roof gardens, roads, bridges, tunnels, parking lots, swimming pools and other projects waterproof moisture. It is recommended to use polyester tires with excellent extension properties for projects with large deformations, and relatively inexpensive fiberglass tires for other buildings.
2. JS composite waterproof coating for roof waterproofing and trapping materials
JS composite waterproof coating is also called polymer cement-based waterproof coating, and the six ministries and commissions of the Ministry of Construction and Ministry of Science and Technology strongly recommend new types of green waterproof materials. JS composite waterproof coating is a two-component, water-based waterproof coating composed of a polymer acrylate polymer emulsion as a liquid material and a cement and other inorganic powder. JS composite waterproof coating not only has the advantages of high elasticity of polymer materials, but also good durability of inorganic materials. It can form a high elasticity and high strength waterproof coating after brushing, and it is excellent in water resistance, weather resistance and durability; nontoxic , tasteless, non-polluting, can be constructed on the wet base surface, can be firmly bonded with various materials such as the base surface and cement mortar; construction on the facade, bevel and top surface does not flow; high temperature up to 100 °C. JS composite waterproof coating can be used in all kinds of new and old buildings and structures waterproofing projects. It is easy to operate and simple to construct; it can be formulated as a color coating according to needs.
Whether it is SBS, APP modified bituminous waterproof membranes, or polymer waterproof membranes, the appearance inspection is an important test content. It can be summarized as five observations. The surface is beautiful, smooth, and free from bubbles. Ma Hang, etc., secondly, see whether the thickness of the coil is even and consistent. Third, if the position of the carcass is centered, whether there is any phenomenon of being impregnated (often referred to as the dew-white beak), the brightness of the cross-section oil is four, and the thickness of the covering material is five. Connect firmly. These aspects generally reflect whether the process control of coil production is reliable.
Paint can see the color is pure, with or without sediment. Especially for composite coatings, the current manufacturers of composite coatings are springing up. More and more emulsions and their respective powders are also used in different applications. How to identify the advantages and disadvantages? The easiest way is to put the sample into the cup of clear water, and observe it for a few days to see if the water becomes turbid, whether it swells, there is no emulsion, and then remove the sample. Whether or not it becomes weak and soft when stretched, such a material is very unfavorable in a long-term environment in which water is soaked, and the waterproof quality cannot be guaranteed. Rigid plugging impervious class, after a period of time with or without microcracking, if microcracking, the material is based on the principle of micro expansion, look at whether there is anti-tide phenomenon, if there is anti-tide phenomenon, the lack of material Water repellents, such materials are not good impermeable materials and can only be used for plugging.
When we buy it, we use the nose to smell the odor. We often have this experience. Some SBS modified bitumen rolls have almost no odor. During the baking process, they are less likely to give off oil. Once oil is released, they stick. Strong; and some membranes can smell its pungent smell within 100 meters, it is dizzy. When you buy, remember to ask 3 questions. This can be sloppy. Otherwise there is the bitterness behind you to eat oh a question manufacturer's raw material origin, specifications, model; second asked the production line and equipment status; three asked the production process and management level.
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