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CONSTRUCTION OF FLOOR SLABS
Making Moulds

There are two ways to do floor slabs: Cutting the shape into the ground method or by making a timber frame. For cutting the shape into the ground, use a spirit level to cut the dimensions:5cms deep, 150 cms long and 105 cms in width. 

While making the timber frame, check that the diagonals are equal to 183 cm and make sure all corners make 90 degrees angles. 

Squat hole mould 

Make the mould for the squat hole in the shape and sizes given here:



Vent pipe mould  



You can use either a brick wrapped in paper or a wood block









Reinforcement 
  • Clear a flat even area for the slab.
  • Spread plastic sheets on the ground
  • Cut a piece of mesh (BRC.610) to the size of the mould
  • Place the vent mould one brick width from end
  • Place the squat hole mould one the width of one brick + 20 cms in front of the vent mould
  • Cut the mesh away from under the moulds.

Concrete mix

Concrete Mix: 1 part cement, 2 parts sand, 4 parts aggregate
Prepare a dry mixture. Add water
Put little concrete into the frame
Raise BRC 610 so it is in the centre of the concrete
Compact the concrete to make it level with the top of the frame
Finish with a wooden float

! Do not make the concrete slab too wet as this will make it weak and cracks will develop
 

Curing the concrete:

After 30 mins remove the squat hole mould and vent pipe mould.
Every day for a week pour water on the concrete and cover it with plastic, grass or sand to keep it damp.

Placing the Floor Slab

Put a mortar layer on the top course of the bricks.

Fill the earth around lining.
Lift the slab onto the lining and make sure it is level.


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