A: RBak, When installing on ceilings, the long dimensions must be perpendicular or horizontal to ceiling joists. Also all panel ends and edges be supported by framing, blocking, furring or a solid nailable backing. Drywall is not a nailable backing. Since 24" oc is the max span, We recommend adding additional blocking for support.
A: I have installed on a ceilling with rafters 16 inch on center I would suggest backing with 1x2 behind the panels for extra support. I used a drywall hanger on ply bead panels to hold while applying screws. So far, over two years on front porch without any issues, knock on wood. Good luck.
A: Shaen, Ply-Bead can be installed direct to stud.
A: It's very sturdy installed directly over studs, even 24" apart. I did my front porch ceiling, 38' by 8', 24" on center 2 years ago, it looks perfect still. I used drywall screws, countersunk, and spackling over the screws. You have to sand the joints to get them to look seamless.
A: You may use Ply-Bead on the ceiling of a porch. You cannot use it as siding as it is not an exterior product. It is an Exposure 1 grade product.
A: I’m using it on the inside of my screened porch. It’s on the outside walls about 30” high. Seems to be holding up well but I did paint it almost immediately. I think it is considered to be a siding product. It would need to be sealed or painted.
A: Ryan Reynolds, You can use the Ply-Bead for the inside walls of a shed. It is not appropriate for shed siding.