Stop in for a cup of coffee

zkx14 said
Yeh, I get that its a complication. Not sure How Ray's is, cause I think its a continuous slab @halifaxhops
Could do separate slab for that area. Don't think you want all one in a 30x 40 anyway. A few smaller and less likely to have cracks later. I know in the cold storage the crane runs for setting steel and roof units were thicker slabs than the rest of the floor.
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Thats what expansion cuts are for. the distance between those cuts depends on the thickness and grade. For example: M10 grade is going to need expansion cuts much closer than M70. We poured M70 in the 40x80, no expansion cuts and it hasn't cracked yet, 22 years later. 14 inches thick in some places.