A concrete shed foundation is perhaps the best solution for your shed floor.
The advantages to having a
concrete shed floor are numerous.
It won't rot like a wooden
shed floor might. If you are going to use your shed as an animal shelter,
cleaning of the floor will be much easier than if it was a wooden floor. It's
very difficult for a concrete shed floor to become unearthed! Chances of your shed
remaining right where you built it on the concrete are very good as opposed to
a wooden shed floor.
The one big disadvantage to
doing a concrete shed foundation would be cost. Unless you are willing to put
out some big bucks depending on the size of your shed, a concrete floor could
be well over half the cost of your total shed construction cost.
If you do decide on going
with a concrete shed foundation, make sure that when you are laying out your dimensions
that the concrete is the exact same size as the footprint of the shed size you
will want to build.
In other words, if for
example you want to build a 12x16 shed, your exact concrete dimensions should
be 12x16. Also when you have poured your floor, you will already want to have
the locations ready for you to insert your 'j-bolts' in to the semi-wet
concrete to that you can bolt your walls to the floor. This can be done afterwards
but is much more work and very time consuming.
It's always a good idea to check with your local building department that issues building permits to see if your concrete shed floor requires a footer.
In most localities, it is not necessary for these slabs-on-ground to have frost footings, as they are generally designed to be floating.