Is it common practice to cut siding a little short at J channel to leave room for expansion inside the j channel?
I’m not familiar with the whole process of siding a house, so I can imagine one might leave room for expansion at the corners.
Thanks for the help!
Upgrading the footings and columns that support a girder beam is an opportunity to level out the floor above.
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For vinyl siding, yes. also you don't nail it fully into the wall sheathing, but leave the nail a bit loose so the siding hangs on the nail, and can expand and contract.
The siding maker should offer installation instructions. for an example
https://www.certainteed.com/resources/Siding_InstallGuide_CTS205_2007_E.pdf
which says, in part,
Always leave room for expansion and contraction into receiving
channels like outside cornerposts, inside cornerposts, and
J-Channel. If the temperature is above 40°, leave 1/4"; if the
temperature is below 40°, leave 3/8".