I have 3 6x6 pt post I will need to wrap. We bought some 1x6 and 1x8 comb fascia boards. Is there a way to cut and assemble them so they don't split or open along the seams?
OK so what's a "comb fascia"?
They make post wraps that just snap together and just need to be cut to length, no screws needed.
If your trying to use PVC lumber, which would be a royal pain to do and keep lined up I be using these.
https://www.homedepot.com/p/FastenM...stenMaster-Cortex-75-Piece-Fastener-Set-for-AZEK-Trim-FMCTXT-AZ50TDHD/202502288
the top and bottom collars is where the verticle structural stability comes into play.
to retain a constant distance between the wrap and the inner post,
you can tack a few pieces of 1/2 or 3/4" styrofoam spacers around the post.
(taking that additional measurement into consideration when
fabricating the wraps).
We see all kinds of wrap , wood like the OP is doing to expanded size all the way ip to covered with stone. The wood of the wrap never touches the deck. Only the post makes it all the way to the floor.
For a simple wrap you can't beak plastic.
https://www.youtube.com/watch?v=ejeGnmcOYDQ