We tend to go with 10' spacing on the control joints whether tooled or saw cut. We get a lot of requests--and some are adamant--that they want 6x6 wire mesh. Some building inspectors don't allow it for many reasons: doesn't do any good as the concrete is going to crack anyway, and when it does crack the joint allows water to rust the wire then the wire breaks. Also, some concrete recyclers are refusing to accept wire-containing concrete as it tears up their equipment. I charge 50%-100% more for removal if I find wire in concrete.

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