How To Build Your Shed's Foundation
In less than 4 minutes, you’ll discover how to lay a concrete slab for the foundation of your shed.
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It is important to first select a good reasonable level site for your slab. Once you have chosen a site, clear the the area and remove any grass. Using pegs, roughly mark out the area and determine how much digging will be required. Now dig out the area. Visually establish high points and low points and use soil to level the area as best as possible. Measure and construct the box away from where you plan to put the slab, this gives you room to maneuver and work. 30 by 100 mill treated pine is ideal for the box frame. In this case the box dimensions are 3.1 by 3.1 which allows for a 50 mill rebate. Once you have dug the area out and made it as levelled as you can, place the box in the area. The required thickness the of lab is 100 mill. Using a spirit level fill or dig out areas in order to ensure the boxes level. In this area there is a slight slope in the land running into a far corner, this makes the area around 180 mill to low so we need to bring it up by 180 to full, remembering that our slab thickness is 100 mill. Now that the boxing is in position, built up a level. Drive pins into the corners and sides to stop the box from moving. Pegs or wooden stakes are ideal in some cases you may need more than one peg on the
side it is important to check the depth that the area you will be filling with concrete.
Place a straight edge to the board,across the length and width of the box. Use a spirit level and check the depth of the area within the box, remember it has to be 100 mill because that is the thickness of your slab.
Fill in areas too low and remove those areas too high, ensure that the fall of the slab follows the contour of the land. Now that the area is level, likely wet it down this will assist with compacting. The next step is to lay building plastic down and line the area. Place reinforcing steel mesh on top of the plastic alike appt F52 gauge meshes all that is required, this holds the concrete together and help stop theconcrete from cracking.
This particular slab will require one cubic meter of concrete and we are using a twenty MPA concrete mix, which basically means the stones of
gravel used is 20 mill. Pour the concrete in and level it out with shovels to the height of the boxing. Scrape the concrete off with an aluminium screen or length of of timber. Oregon pine is light and inexpensive 70 by 30 mill 4 to 5 meters long with a person at each end is ideal. Simply work the concrete across as demonstrated. Using a bull float will give you a good finish. Let the concrete go off or old dry out a little for about half an hour then complete rebate with an edging tool. And finish off with a trowel. Leave for a day or so depending on your weather conditions. And your slab is ready to assemble, your Absco shed!