Noticed that new cast iron bathtub was set on a wall ledger and front ledge
and feet are shimmed on wood shims for level. I thought that bathtubs are
generally set between concrete channels in case of earthquakes. Does the
tub supported on ledgers on both sides and sitting on wood shims under feet
Very frequently, with overflows that make their way to
the wood below, with the weight of the tub, the wood sags
a bit. Sometimes, quite a bit. So the new tup needs to be set
level, and so it is shimmed. Unless you are in an area of
specific municipal codes calling for construction otherwise,
your understanding regarding earthquake preparedness is not
As far as I know, most manufacturers will indicate
that the shimming is to be done by bedding the unit into
Quikcrete or similar product. Keeps it from having
single points of support that can cause fracturing later.
Even nicer, IMO, to bed not only the outer edge in
concrete, but also the main part of the tub if it's fiberglass.
Makes for such a secure feeling when you're taking a shower.
When I did my remodel, I used thinset for under the unit,
but you really have to work quickly. I built the levels up
till they were almost there, then a last glop over it all and put
the unit in to be pressed into position. The job was perfect,
but it's not a job for the faint of heart.
No it does not. Thinset is mortar -- Portland cement, sand, lime. It sets
by chemical reaction and dose not dissolve in water. It is what you use on
cement board to set tiles in wet locations, among other uses.
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