On Jun 9, 7:40*am, wrote:
I would like to cover the ceiling a porch with something. *What is
there now are 2X4 appearance "beams" spaced 16 inches apart. *I like
the look of bead board, but am thinking that the 1/4" thickness isn't
substantial enough. *It may end up sagging.

So what I thought I might do is cover the area with plywood first,
then attach the bead board to the plywood. *Or, attach (glue?) the
bead board to the plywood first then install over the ceiling.

Good idea, bad idea?

If you use T&G be sure to randomize each row so the butt seems never
line up.