I have not heard of it. Are you sure they are not talking about thinset
mortar? In any case if it is concrete, the recommendation is to allow the
concrete to cure for at least a month. This might not be a problem for a
new home, but having a bath out of commission for a month could be a problem
for some people.
I suspect he is talking about a mortar bed versus using a backer board. I
have done a lot of DIY tile and have always used durock backer board. I
ripped up a morter bed install once. It was a real PIA. The main problem
with mortar beds IMO is that they create a much thicker finished floor. This
will raise the finished height too high usually. The advantage is that they
can make up for a wavey un-even substrate and they seem more solid. The old
timers will probably prefer mortar beds, young guys backer boards.
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