Laying a Concrete Slab

Laying a Concrete Slab


Laying a concrete slab could be the most challenging part of building a garden shed. Below is a full demonstration of the process with a video to make this step easy for you.

  1. It is important to first select a good, reasonably level site for your slab.
  2. Once you have chosen a site, clear the area and remove any grass.
  3. Using pegs, roughly mark out the area and determine how much digging will be required. Now, dig out the area.
  4. Visually establish high points and low points and use soil to level the area as best as possible.
  5. Measure and construct the box away from where you plan to put the slab.
  6. This gives you room to manoeuvre and work.
  7. 30 by 100 millimetre treated pine is ideal for the box frame.
  8. In this case, the box dimensions are 3.1m by 3.1m, which allows for a 50-millimetre rebate.
  9. Once you have dug the area out and made it as level as you can, place the box in the area.
  10. The required thickness of your slab is 100 millimetre.
  11. Using a spirit level, fill or dig out areas in order to ensure the box is level.
  12. In this area, there is a slight slope in the land running into a far corner.
  13. This makes the area around 180 millimetres; too low so we need to bring it up by even and fill remembering that how slab thickness is 100 millimetre.
  14. Now that the boxing is in position, build up a level, drive pins into the corners, and sides to stop the box from moving. Paint pegs or wooden stakes are ideal.
  15. In some cases, you may need more than one peg on the side.
  16. It is important to check the depth of the area you will be filling with concrete.
  17. Place a straight edge tint before to cross the length and brink of the box.
  18. Use a spirit level and check the depth of the area within the box.
  19. Remember, it has to be 100 millimetres because that is the thickness of your slab.
  20. Fill in areas too low and remove those areas too high.
  21. Ensure that the fall of the slab follows the contour of the land.
  22. Now that the area is level, lightly wet it down this will assist with compacting. The next step is to lay building plastic down and line the area.
  23. Place reinforcing steel mesh on top of the plastic.
  24. A light f52 gauge mesh all it is required.
  25. This holds the concrete together and helps stop the concrete slab from cracking.
  26. This particular slab will require 1 cubic meter of concrete and we are using a 20 MPA concrete mix, which basically means the stones or gravel use is 20 millimetre.
  27. Pull the concrete in and level it up with shovels to the height of the boxing.
  28. Screen the concrete off with aluminium screen or length of timber.
  29. Oregon pine is light and inexpensive 70 x 30 millimeter, 4-5 meters long with person to reach in is ideal.
  30. Simply work the concrete across as demonstrated.
  31. Let the concrete go off or dry out a little for about half an hour, then complete rebate with an edging tool.

And finish off with a trial.

Wait for a day or so depending on your weather conditions and your slab is ready to assemble your Absco Shed.

If you have any comments or questions, please do not hesitate to get in contact with us.


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