> Any untreated wood--like purlins--that is continually wetted will rot, and informed people do not want treated wood inside their homes.
Informed? Why would someone not want treated wood inside their home if it is not subject to physical abrasion nor to leaching? Most homeowners don't eat their purlins.
Most treated wood now days is treated with copper naphthanate or equivalent and does not yield heavy metals in a toxic form.
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