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How far out of square is acceptable?

Under 1/8" is typical (even on much larger buildings), but it's just a shed, so @batsplatsterson has an answer I'd agree with. If using sheet goods (plywood, OSB) for roof and floor you'll have some extra waste to trim due to the out-of-square condition.

diy.stackexchange.com - How far out of square is too far? - Home Improvement Stack Exchange

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vinegar Combine equal parts vinegar and warm water in a spray bottle and spritz this solution on the mold. Let the solution dry for one hour, then...

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What can you fit in a 12x20 garage?

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Getting the foundation plates square (or rectangular as the case may be) is essential to getting a building to assemble correctly from start to finish. The first part of this is to get all the lengths on like sides cut exactly the same (even down to less than 1/32". The diagonals should be as close to exact as you can measure. Make sure to even take into account any droop in the tape measure as you measure across the base plate frame. The droop can easily add an extra 1/4" or more to the measurement. If you need to lay put extra material along the diagonals to keep a floppy tape measure straight then do so. When I build I strive for the diagonal measurements to be well less than 1/16" even if it means that I have to repeatedly reposition the frame. When you go to frame the walls it is also essential that you get the top plates to be exactly the same length as the base plate. Careful use of a level to get the corner studs plumb is equally important. Make sure to add diagonal bracing to the stud assemblies to hold things square before you apply any sheathing to the walls. When the top plates are installed make sure to once again check that the diagonal measurements are the same across the top of the structure. If you have done everything carefully the diagonals at the top of the plates should be the same as what you measured for the base plates. A handy hint is to write down the base diagonal measurement so that you can refer to it when measuring the top plates. When the tops are squared up you should temporarily tack up a few sheets of the sheathing on the walls. Then recheck the top plate diagonals before committing to nailing all the sheathing in place. Once the sheathing is in place it can be difficult to re-square the top of the walls. I go into this in so much detail because if the top plates are not square you will end up with difficulty dealing with setting rafters and getting the roof sheathing to lay down nicely on the center lines of the rafters. Even an 1/8" of error in the top plate squareness can translate to much more error on the roof sheathing.

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Can you pour concrete on wet ground?

Damp ground will not be a problem unless is can not support the weight of the concrete. Cement/concrete does not "dry" , it cures , a chemical reaction. It absorbs water to cure, as noted , some concrete applications are sprayed with water to aid the cure.

diy.stackexchange.com - patio - Will concrete poured over wet ground be more likely to crack and ...

Civil engineer here. The concrete needs to stay wet in order to cure properly. As noted before, concrete doesn't dry out to harden, it cures through a chemical reaction that needs water to facilitate the reaction. If the ground is dry, the ground will absorb moisture from the concrete and it won't cure properly. The ground should be very moist and compacted as well as you can manage. Also, wet clay is notoriously weak and you may end up with uneven support under the concrete, which will then lead to it cracking and settling after it's cured. Hard to say without seeing it but if you can remove as much clay from beneath the concrete slab, you'll have less chance of it settling and cracking. This is especially true if the clay is expansive. It will expand when wet and shrink when dry and your concrete slab will be a disaster. Best to get as much clay removed as possible, compact the sub-grade evenly, and make sure to water the ground before placing the concrete. Have you thought about proper joints? Concrete will crack. If you can get it to crack along a joint, no one will see it. Look at some professionally done concrete flatwork and you'll see what I mean. Good luck.