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It should be the carbon slag after the coal is burned, which not only saves money but also has a good effect. Everyone should have this common sense. Hope that helps!
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No problem, it is generally taken into account in the design of the house.
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There is no problem with filling the floor with sand, but he does not absorb water very well, it is better to make a compartment.
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Use large block bricks and you'll be fine.
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Aluminum alloy, lightweight boards such as EPS foam board (the kind of board that simple houses have, light weight, sound insulation and insulation, easy installation), aerated concrete blocks (low density, light weight, high strength). It can be purchased in the building materials castle.
Use sand to adjust the cement leveling, this bricklayer master will help you do it well.
Underneath the bathroom and is there a ceramsite?
First slag and then sand leveling. The key is tamping.
It is recommended not to use all sand, the sand will settle after soaking in water, and it can be mixed with chiseled brick ash!
Yes, it will be better to be overhead and reduce the pressure on the floor.