Posted by RSCO on November 16, 2010 at 13:00:11 from (64.136.26.228):
In Reply to: Metal Building posted by Soldier Tom on November 16, 2010 at 10:44:25:
I spent my working life in the building business; houses, not farm buildings, but I'll pass along my thoughts. I'm not sure what you mean by a gully, but if it's what I envision, I wouldn't do it. It sounds like a trap for snow and water and that will lead to rust on a steel building.
2nd point: put plenty of steel in the concrete. Run at least #3 (3/8")rebar at 18" o.c. each way and make sure the rebar is pulled up to about the midpoint of the slab thickness. The rebar will control cracking and prevent heaving or lifting along any cracks that do occur. I assume you'll also have a thickened edge and that your plans specify rebar for this.
3rd point: Score your slab at no more than 10 ft. intervals each way. The purpose of this is to create a weak point so that the slab will crack where scored rather than haphazardly. If you plan to use your building as a shop, then I'd score it with a saw as this will make it easier to roll items like floor jacks and creepers over the score lines. If you won't be using it as a shop, then a parting tool is probably fine.
In case you're wondering about my concern about cracks, concrete will crack. That's something it does since it shrinks as it cures. The purpose of the steps I've outlined is to control the cracking so that you get a good floor that lasts.
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