This is a frequently asked question. I have plywood. I am installing a solar system in the shop and have to make the 3circuit drops out of the attic and get into the solar Combiner, a disconnect then into the panel. I used 8’ sheets with the 2’ topper as the 8’ are so much less costly than the 10’s. I had to cut the red band to do this, but start to finish was less than 15 minutes to get into the wall and it will take about the same to replace.
