by tricky ™
turkystick asks: Need advice on how to build a concrete base for a shed?
I want to lay a concrete base for a 7×5 shed over grass but im unsure what is the best way to do it as my garden is on a slope, now i don’t know what angle the slope is but if i put a board at the highest point of the slope and level the board there is a 6 inch gap at the lowest point of the slope. If you had to make the base how would you go about it as i don’t know what boards to get and how much concrete will be needed.
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Answer by Bazza
There are concrete calculators on the ‘net. Invest in a longish spirit level and dig out to give a roughly level base. Then set in 1″ x 4″ sawn planks levelled to contain the concrete. Brush oil on the inside of the planks to stop the concrete sticking and drive pegs down on the outside to combat bowing. You can mix the concrete by hand if you are fit, but a small hired electric mixer is much easier as wet concrete is extremely heavy. Use a mix of six parts 20mm ballast to one part ordinary Portland cement by volume. Use a bucket to measure, not the shovel. Do not add too much water as this weakens the concrete and you will be swimming in it when tamping the mix down. Add just enough water to make the mix workable. This is the secret of strong concrete. Cover to protect from frost and keep it damp. It is the presence of water that cures concrete. Rapid drying will weaken it.
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