[jwend]

On the concrete it is a common misconception that thicker is better the density and cure rate that determines strength.. I would have no fear building a wall on the pad you have... It's not like you are building a 2 storie house or a 500000$ home who cares if it shifts a little etc.. it doesn't have to be perfectly square.. just my .02.... Roll on with it just over anchor and over build. That's my rule of thumb. Just as long as it is safe and meets building code