I am finishing a basement and we are putting down an OSB subfloor which will eventually have wall to wall carpet over it. Should I install base trim before or after the carpet goes in?
You can do it either way. In new construction we put the base down first, keeping it up about 1/2" above the sub-floor. Sometimes the new paint gets marked up a bit, so is then touched up after the carpet is laid. If installing the base after the carpet is laid. Pre-paint the base and lay it on top of the carpet, not pushing it down too hard onto the carpet. The nail holes are then filled and touched up.