Concrete foundation usually is not perfect leveled. So we use shim to make mudsill level. But after visited a few construction sites, it seems to me that shim they used is soft wood and not pressure treated. Is it OK? What if it starts to rot after a few years? Thanks.
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I shim on top of the mudsill, under the rim joist. The shim is no more exposed to rot than the rim joist would be.
I see. I also saw some people use two sill plates. The shim is wedged in between. (I don't know why the extra upper sill plate is needed besides this reason, hiding the concrete bolts and/or raising the basement ceiling 1 1/2" higher.)
I guess probably people don't care. As long as it makes work acurate during framing, after a house is built, a little settlement is not a big deal.
After a google search I found there's steel shim available. I think that's what I need.