How should waterproof membranes be constructed?

Waterproof membranes are widely used in various industries, and the housing decoration industry is particularly fond of them. What is the method of waterproofing membranes for building roofing?

(1) Setting and construction of the division joint

The division joint shall be set at the support end of the roof panel, the intersection of the roof turning point, the waterproof layer and the protruding roof, and shall be aligned with the roof panel joint, so that the waterproof layer is caused by the influence of temperature difference, deformation of the shrinkage structure and the like. Cracks in the waterproof layer are concentrated to the joints to avoid cracking. The spacing of the division joints should not be too large. When it is more than 6 meters, a “v”-shaped division joint should be set in the middle, and the depth of the division seam should extend through the thickness of the entire waterproof layer. When the split seam doubles as the exhaust passage, the joint can be appropriately widened and the vent hole is vented. When the roof is made of petroleum, asphalt and linoleum as the waterproof layer, the quilt joint of 200 mm to 300 mm width should be added at the joint seam. Use asphalt glue to affix a single side, and fill the gap with the glue.

(2) Roof screed construction

The roof is a combination of building slopes and structural slopes. After finding the slope according to the structure of 3%, use the 1:6 cement slag or cement expanded vermiculite to find the slope on the structural layer, and then make the 25:1 thick cement mortar leveling layer. When the building is looking for slope, be sure to find The quasi-over-water slope and the direction of the water flow shall be straightened, struck and barbed between the highest point and the drain, and the thickness of the drain shall not be less than 30 mm. When pouring, be sure to roll and press with a roller and a ruler to make it dense.

(3) Construction of roof isolation layer

In the construction process, according to local conditions, take advantage of the length and complement, the layer of the two cloth three oil coil waterproof layer on the surface between the leveling layer and the rigid layer, not only the role of the isolation layer, but also not exposed to the sun and rain, both prevent The grease is aging and it is waterproof.

When constructing the waterproof layer of the coil, pay attention to the following points:

1. The base layer is coated with a scraping layer treatment agent, which is required to be thin and uniform. Generally, after drying, the coil material can be laid without sticking hands.

2. The paving of the waterproof coiled layer should generally be carried out from the lowest level of the level to the parallel ridge, so that the coil is overlapped according to the direction of water flow. When the slope of the roof is greater than 10%, the coil should be laid perpendicular to the direction of the ridge.

3. Paving method: peeling off the separator paper of the ridge of the coil, and sticking the coil to the surface of the base layer, the long side of the coil is overlapped and kept 50 mm, the short side is overlapped and kept 70 mm, and the coil is required to maintain a natural slack state. Do not pull too tightly. After the coil is laid, it should be fully compacted with a flat vibrator. The vertical part is hammered with a rubber hammer.

4. It is advisable to select the waterproof layer construction temperature above 5 °C.

(4) Construction of steel mesh and fine stone concrete rigid waterproof layer

In the concrete waterproof layer, a cold-drawn steel mesh of two-way Ф5@200×200 shall be provided and disconnected at the division joint to enhance the rigidity of the waterproof layer and the integrity of the plate, and the arrangement of the steel mesh in the waterproof layer Should be as far as possible on the part. The thickness of the protective layer of the steel mesh shall not be less than 10 mm.

The strength grade of the fine stone waterproof layer should not be less than C25, and mechanical agitation should be used. Mechanical vibration should be used. The water-cement ratio of concrete should not exceed 055, and the cement label should not be lower than 425.

The thickness of the crucible should not be less than 40 mm. If it is too thin, the water will lose water quickly, and the cement will not be fully hydrated, thus reducing the impermeability of the crucible. The surface treatment of the waterproof layer should be emphasized. The thickness of the panel should be consistent. The slope of the drainage should meet the requirements of the specification. After the water is collected, the secondary calendering is carried out to cut and close the capillary in the crucible to improve the impermeability. When wiping the surface layer, it is strictly forbidden to sprinkle water on the surface, add cement slurry or dry the cement to prevent cracking and peeling and reduce the waterproof effect.

Waterproofing can be carried out for 12 to 24 hours, and the coverage time is not less than 14 hours. At the beginning of the maintenance period, it is not allowed to be a person. The maintenance of cockroaches is an extremely important final step of the waterproof layer of fine stone enamel. Poor maintenance will cause early dehydration of the cockroaches, which will not only reduce the strength of the cockroaches, but also cause sanding on the internal crack surface due to shrinkage, which will greatly reduce the impermeability.