Quote:
Originally Posted by nibs
AC I have no problem making a slab 2 inches thick with a compression strength of 6000 lbs, using high cement content fly ash, fiber and low water content, etc, etc.
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I do not worry about your slab.
My comment relates to the significant thermal variation in a two inch slab that will result from 12" PEX spacing.
If you are interested in a very high efficiency floor, you should reduce the spacing.
At your age, efficiency will never pay for itself, unless you take into consideration benefit to subsequent owners.
-AC
P.S.: Don't whine about your age... I'm older than you.