Typically, we would cut pieces of scrap baseboard and use them to hold the
actual baseboard off the floor when we'd nail it in place. That would place
it at 1/2" off the floor, typically and that's sufficient for about any
carpet. The pad is laid to about the tackless strip, so all that fits under
the baseboard is the edge of the carpet, and that can be compressed..
Personally, I don't see the correlation between the carpet and the
baseboard. The baseboard is a trim to make pretty between the wall and the
floor. If you want to add carpet, fine, but if you take the carpet away,
anything but close to the floor looks like crap.
The industry standard is to do a good job of trimming, little or no gap.
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