What is the construction method of the basement roof drainage board?

1, protective layer When the waterproof project is completed by the civil engineering unit, we will send someone to dry the water in each compartment, then clean it with clear water, dry it in the sun, and then use 1: 3 cement mortar to flatten it to a thickness of 20 and level it locally. Leave a reserved hole under the lintel and cover it with10 PVC pipe. Should be as close as possible to the floor, combined with drainage design. When the garage roof is uneven locally, it must be leveled or follow the principle of height.

2. On the basis of being familiar with and proficient in the drawings, the setting-out workers use the grid positioning method to locate the fire exits, garden roads, sketches, pools, drainage ditches, rainwater wells, etc., and accurately guide the original absolute elevation to the construction site.

3. The drainage ditches are all cushion layers, with hollow bricks 250 high and 50 wide on both sides, and leveled with 1: 2 cement mortar on both sides. Clean up the sundries at the bottom of the ditch and the reserved holes, cover the cast iron cover plate, and then wrap the filter screen on the cast iron cover plate. In fire exits, garden roads, sketches and pools, 5-thick cement prefabricated panels are used for the drainage cover below.