How to level concrete sub floor before installing wooden block flooring?
The recommended method for leveling of concrete in wooden block flooring is as follows:
When earth work under floor is completed, then termite treatment is done as follows
Dig few holes in the earth before laying the floor. Fill them with anti-termite chemical.
Also, fill chemical at the junction of walls and floors.
Dig 300 mm deep holes at the external perimeter of the building and fill them with chemical as a barrier.
Make holes into the earth and fill them with chemicals to treat the soil under plinth protection and around pipe.
Treat expansion of joints at ground level with anti termite chemical treatment.
Use anti termite chemical to treat ‘chowkhats’ or door frames before fixing them into the building.
Before laying floor, the base coat and concreting should be laid in the following manner:
Floor Levels should be marked on the walls and pillars with the help of water level.
Water level tool
(This picture is contributed by Rashi)
The earth under floor should dressed according to floor levels marked on the walls and pillars
The earth should be properly compacted with the help of watering and ramming.
Do Sand piling to ensure proper compaction of the earth under floor.
Lay 100 mm thick fine sand on compacted earth.
After laying fine sand, lay 100 mm thick cement concrete in the ratio 1:8:16 with the help of mechanical mixer.
It must be ensured that the base coat laid is fully compacted by hand rammers or with surface vibrator.
A layer of leveling concrete should be at least 25 mm thick.
Cement concrete should be in the ratio of 1:2:4 i.e. 1part of cement, 2parts of fine aggregate and 4 parts of coarse aggregate.
It should be laid in proper slope and in level with the help of straight edge and trowel.
It should be perfectly compacted by hand compaction with wooden thappy.
The surface should be finished with wooden float to give sand paper finish, plane and true to level.
While laying and leveling concrete, ensure the finish level of the concrete. It should be lower than the proposed finish level of the flooring by the specified thickness of the wooden block plush minimum of 1.5 mm.
It should be cured for 7 days. After curing the surface allowed to dry thoroughly before paving the wooden blocks.
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