It depends on the technology whether the secondary drainage outlet will be blocked when it is backfilled. It will generally set secondary drainage before decoration, so as to avoid water backflow and water problems, but if it is blocked, the secondary drainage is meaningless. Quding Life will bring you how to prevent blockage of the secondary drainage outlet, I hope you will like it.
One, two times the drain backfill will not be blocked
1. When many homeowners renovate their bathrooms, they install secondary drains, which are more suitable for sunken toilets and, if backfilled and constructed correctly, will not block the secondary drains. If the drain is blocked, there is no point in setting up a secondary drain pipe. Once the drain cannot drain, it will cause water to backflow, resulting in water problems.
2. For the secondary backfill, first build red bricks on both sides of the drain to reinforce the drain pipe and prevent displacement. Because once shifted, the joint is easy to loosen, resulting in water seepage problems.
3. Next, the drainage pipe needs to be backfilled with cement mortar. At the same time, two coats of waterproof material should be brushed on the bottom of the pipe before backfilling. For backfill at a later stage, ceramide backfill is usually used because it absorbs water and is relatively light, which does not add to the load and of course costs a little more.
4. Through this series of steps, the purpose of secondary drainage can be ensured, and the drainage outlet will not be blocked.
Two, the second outlet how to prevent blockage
1. Check valves should be used in all drainage pipes to prevent overflow of the drainage pipe after the return water of the pipe. The floor drain is also anti-fall floor drain to ensure secondary drainage and more waterproof treatment of the sedimentation tank.
2. Use check valves for toilets and all washbasins and sinks to effectively prevent backwater from secondary drainage holes.
3. Two 45° or 90° elbows with bending radius not less than 4 times of pipe diameter should be used to connect the drainage standpipe and the horizontal main pipe. Drains should be connected in straight lines as little as possible. The diameter and slope of the drain pipe should be increased appropriately.
Three, the toilet second outlet will not backwater
A return of water is still possible, but less likely. In fact, if the drainage efficiency is relatively high, coupled with the waterproof, you can not do secondary drainage, after all, secondary drainage in the underground add a connected with the pipe mouth, once the water back is very troublesome. There is also the choice of floor drain is very important, must choose the water super fast floor drain, avoid surface water overflow, so that you do not need to do secondary drainage.
