A concrete shed base is the strongest type of shed foundation. it is at the heavier end of the work you will do to build your shed. this article will help you to decide if you really need such a heavy duty solution or if something a bit lighter and simpler to install would work just as well.. Example: shed base 8' long x 6' wide x 3" deep the volume = 8' x 6' x 0.25' = 12 cu ft 2 bags per cubic ft = 24 bags add 10%, 3 bags for compacting total 27 bags of ballast cement 1 bag (25kg) of cement mixed with the ballast in the ratio of 1:5, 1 bag of cement to 5 bags of ballast 27 bags of ballast divide by 5 and round up would = 6 bags of. As a rule; your base must be 75mm larger that the finished slab to allow for formwork. clear the area of stones and plants and excavate to a minimum depth of 100mm (deeper for soft ground). the ground should be levelled and well compacted using a small garden roller or a lump hammer to provide a base for your concrete..
Concrete slabs intended for exceptional loads, such as commercial yards, lorry parks etc., will be at least 200mm thick and should be specifically designed as they will probably require a sub-base of at least 100mm thickness, and steel reinforcing mesh or a fibre-reinforced concrete.. A shed base is an essential part of building a shed (whether they may be wooden or metal garden sheds), the base has to be properly made to give your shed a solid foundation.. Best answer: hi the last time that i used 300mm thick concrete in a slab was when i poured the foundations for arrester barriers at the end of a military (tyndal nt australia) runway to stop f111's from overshooting..
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