The slab foundation commonly used for sheds is called a slab-on-grade foundation.This combines a 3 1/2"-to 4"-thick floor slab with a 8"-to 12"-thick perimeter footing that provides extra support for the walls of the building.The whole foundation can be poured at one time using a simple wood form.
Because they sit above ground,slab-on-grade foundations are susceptible to frost heave and in cold-weather climates are suitable only for detached buildings.
Specific design requirements also vary by locality,so check with the local building department regarding the depth of the slab,the metal reinforcement required,the type and amount of gravel required for the sub base,and whether plastic or an other type of moisture barrier is needed under the slab.
Because they sit above ground,slab-on-grade foundations are susceptible to frost heave and in cold-weather climates are suitable only for detached buildings.
Specific design requirements also vary by locality,so check with the local building department regarding the depth of the slab,the metal reinforcement required,the type and amount of gravel required for the sub base,and whether plastic or an other type of moisture barrier is needed under the slab.
A slab for a shed requires a lot of concrete:an 8×10-ft.slab
designed like the one in this project calls for about 1.3 cubic yards of
concrete;a 12×12-ft.slab,about 2.3 cubic yards.Considering the amount
involved,you'll probably want to order ready-mix concrete delivered by
truck to the site (most companies have a one-yard minimum).Order
air-entrained concrete,which will hold up best,and tell the mixing
company that you're using it for an exterior slab.
An alternative for smaller slabs is to rent a concrete trailer from a
rental center or landscaping company;they fill the trailer with one
yard of mixed concrete and you tow it home with your own vehicle.
Once the form is filled,load a couple of wheel barrows with concrete(in case you need it)then have the driver dump the rest.Be sure to spread out and hose down the excess concrete so you aren't left with an immovable boulder in your yard.
If you've never worked with concrete,finishing a large slab can be a
challenging introduction;you might want some experienced help with the
pour.
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