Do You Know How To Backfill A Sunken Bathroom?

There are many advantages to a sunken bathroom. Its drainage method is on the same floor, so when our home leaks, it will not affect the neighbors downstairs, nor will it be affected by the noise from the neighbors upstairs when they flush. And we can freely plan the locations of bathrooms, floor drains, sinks, and shower rooms, and arrange the direction of sewer pipes. There is no need to raise the floor when installing a squat toilet.

However, compared with traditional partitioned and drained bathrooms, the decoration of a sunken bathroom is more complicated. Since the floor slab sinks to form a caisson, we need to deal with the caisson during decoration. The most common caisson treatment method is definitely number-backfilling.

Different decoration companies have different backfill methods and use different backfill materials. What material is better for bathroom backfill? What's the difference between them? Today we will talk about these issues.

construction rubbish

Construction waste is actually construction waste. The earliest methods of backfilling bathrooms were done this way. During construction, decoration workers directly poured the decoration waste into the caisson, and finally leveled the ground.

Using construction waste to backfill is simple and convenient, and can also save a lot of waste removal freight. However, construction waste is uneven in size, heavy, hard, and has no ability to absorb water or moisture. Using construction waste backfill will only increase the load on the floor and cause the bathroom to sink. Moreover, sharp edges and corners can damage the bathroom’s waterproofing and waterproofing layers. Plumbing can easily lead to bathroom leaks.

Therefore, the disadvantages of using construction slag backfill far outweigh its advantages. Nowadays, this method of backfilling construction slag has been eliminated, but there are still some decoration workers with "slippery hands". Everyone must be careful when decorating.

Carbon residue

Charcoal residue, as the name suggests, is the charcoal residue formed after we burn wood. It's similar to our activated carbon. It's lightweight, environmentally friendly, and very cheap. It also has certain hygroscopic and moisture-proof effects.

However, the carbon residue is relatively soft and can easily block the secondary drain outlet. It is easy to settle after absorbing water and getting damp, making rework inconvenient. Therefore, the backfill must be kept dry during construction and must be compacted. Cement grouting should be used on the top to prevent cracks in the carbon residue. This can lead to leaks and sinking.

Ceramsite

The raw material of ceramsite is ceramic round or oval particles with small diameter, light weight and round surface. There is a layer of glaze on the outside, which can effectively isolate water vapor, will not damage the pipes and waterproof layer, and has certain thermal insulation and sound insulation properties. , so it is a more mainstream bathroom backfill material.

However, the price of ceramsite is relatively expensive, about 300 yuan per square meter, and it has no anti-odor effect. Backfill construction is also more complicated. In order to reduce the settlement of the backfill material, lightweight bricks need to be used as brick partitions during backfill to separate the bathrooms. Divide the caisson into several small grids, then pour the ceramsite into the partitioned grids, lay a steel mesh on the surface, and finally level it with cement mortar.

backfill treasure

Backfill material is a new type of backfill material that has only become popular in recent years. The raw material is foam cement, which is mixed with foaming agent, waterproofing agent and cement. The backfill soil is highly mobile and can flow to all corners of the caisson. It has strong integrity and can wrap and protect pipes after casting and solidification.

In addition, backfill is lightweight and can reduce the chance of settling in the bathroom. It also has good waterproof, anti-odor, sound insulation effects, long service life, good pressure resistance, and has ground leveling function.

However, the price of backfill treasure is not much cheaper than that of ceramics. The material needs to be mixed and poured on site and has a certain degree of buoyancy. When backfilling, the drain pipe needs to be fixed, otherwise it will shift and cause leakage. In addition, using backfill treasures for backfilling requires relatively high requirements for backfillers. If the backfilling process is not good, the workload and difficulty of repair will be relatively large.

Which material is better?

From the comparison of the above materials, we can find that among so many backfill materials, the best must be backfill material, followed by ceramsite. As for carbon slag and construction slag backfilling, we do not recommend their use due to their many disadvantages. use.

What should you pay attention to when moving caissons?

The biggest hidden danger in sunken bathrooms is water accumulation. If the pipe is damaged and leaks, water on the ground will seep into the ground through the gaps between the bricks, causing water accumulation in the caisson.

Therefore, when arranging drainage pipes in a sunken toilet, secondary drainage must be carried out and a secondary drainage outlet must be reserved at the bottom of the caisson. Even if water accumulates in the caisson in the future, the accumulated water can be discharged through the secondary drain outlet.

What other methods are there for caisson treatment?

In addition to backfilling, there is actually another way to deal with bathroom caissons - overhead treatment.

Compared with backfilling, overhead construction, as the name suggests, does not require filling materials into the caisson. Instead, lightweight bricks are used for construction, and then cement prefabricated panels are laid on the surface. The advantage of this is that the construction is simple and convenient, will not affect the load-bearing capacity of the bathroom, and will not cause any damage to the pipes. Highly destructive and easy to repair.

However, overhead treatments also have some disadvantages. The noise generated by sewer pipes is relatively large, water easily accumulates in the caisson, and the anti-odor effect is relatively average.

Many people will have a question: Is it better to backfill or overhead? In fact, when we decorate a sunken bathroom, the key is to do a good job in waterproofing and secondary drainage of the bathroom, and pay attention to the quality of decoration. Backfilling or emptying is not an important reason that directly leads to leakage and water accumulation in the bathroom, right?

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