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One more item to consider is the edge of the slab or gradebeam. The edge sees the coldest outside temps so if the slab is heated you have a direct connection to the out doors and concrete is not a great insulator. If you use a grade beam I would insulate both sides. Gord

Hate to say this but your gas usage depends on how much you weld. You could weld all day or maybe an hour a day. I am garage manager for a local car club where we rent out 5 to 6 stalls over winter for guys to work on their vehicles. We switched to the smaller 60 cubic ft tanks because we were...