Our church bought a building recently which is a large steel building
with an attached addition. The additoin lies on a conceret foundation
and is framed with 2x4's. Not pressure treated lumber was used what I
can see... and that includes the sill that lies on the foundation. So
my question is... is it nessesary to rip out and replace the sill or
do we take a chance and just leave it? The location is in western
Massachusetts. My only concern is that they are looking to finish the
basement portion of this addition so once the drywall's up... it would
be very costly to have to gut it and start over..... again. :-)
Thanks for your input,
Changing the sill plate would be no picnic, drywalled or not. Of
course, pressure treated sill plates are code, and when building new,
it is a very inexpensive way to cover your ass. However, many, many
times, I have taken apart old work where sill plates weren't pressure
treated, and I have seen no sign of rot. Right under where I sit as
I write this, is an untreated rim joist with concrete poured in
between the joists over the foundation wall. No sign of rot 90 years
later. It all depends on how much moisture is expected. How old is
this building? Are there any signs of water on sill plate? Always
seemed to me that if it was wet enough to rot your bottom plate, you
were in trouble anyway, what with mold and such.
Standard procedure to use all non-treated lumber including the sill plate
some 2 or more decades ago. They simply placed the sill on #15 felt, with
about .5" overhand to the outside of the slab. No reason to replace it
based on what you've stated to date.
If the current slab has the old ferrite iron all-thread, the current form of
pressure treated lumber will eat it up. You have to go to ceramic nails to
retain the new pressure treated sill plate instead.
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