Brent alston says:

Terracotta pots, which are not high
fired, exfoliated after
just a few months of freezing and thawing.


I had a large tray exfoliate its litte feet off over
time during a winter where we had what is called
"killer frost" in California.

I am also a potter and know that clay preparation is
as important as hardness. I tried to make a large
deep pot for a pine. It dried perfect with no cracks.
In the bisque firing the walls exfoliated. I think
because I sent the clay through the slab roller twice,
folding in the process.

I think you have to consider the stress points on your
construction. Of course thrown pots don't have the
same stresses as slab pots.

Kitsune Miko

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