Slab on grade requirements are strictly a matter of what soils are underneath
them and what loads you want to put on them. If you have stable soil under the
slab, then reinforcing won't do much for you. If you have expansive soil as do
most people in the country then the reinforcing will help to hold the slab
together when it cracks under movement. Fiber reinforcing is there to try to
control all of the little small shrinkage cracks, but it makes the surface of
the contrete a bit "hairy". You are probably using polypropylene fibers, in
which case you can actually burn off the protruding fibers with a torch
afterwards. 4" slab thickness is common for home use. If you have higher than
normal loads, such as high shelves or some other form of heavy storage, or if
you intend to run heavy vehicles in there, then you should use a thicker slab.
Also if you intend to install a lift you should consider a thicker slab where
the lift will go.
> Thanks for all your input guys. I think I'm going to spend the 60.00 and
> install a rebar grid under it, using 2' centers. It really wasn't a matter
> of cost, but a matter of do I need to go through the efforts of completing.
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