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I have lot of experience construction of poultry shed ,for slab commonly structural engineer design 4" thick & steel reinforcement 6mm dia bars @ 6" c/c(it will be 0.18 to 0.20 %) i check that minimum cracks occur in the slab but they cannot cause of any mishap a poultry shed normally having 22000 sft covered area ,problem is that if they follow the minimum limits 0.60 % it will be highly effected on cost & client move to TT slab or prefabricated structure.It will be a loss for contractor & construction labor. what will be solution of this problem.