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Carpenters have suggested t1-11, James Hardie panels and pine plybead
panels which are 4x8 sheets, about a quarter inch thick, with the look
of bead board. Tongue and groove is too expensive, so I have to go
with something that won't look as good. All are OK looking as far as
I'm concerned, so my decision will be based on which will perform best
in a porch ceiling application.

Porch is L shaped with one section 5 feet deep 16 feet wide, which
will have the sheets of whatever is used running parallel to 5 foot
"dummy" 16 inch OC joists, which are for appearance only, not
structural. Should nailer boards be inserted between the "joists" to
provid perpendicular surfaces to nail to, or will the 16 inch
intervals be sufficient for sections that will only be 5 feet long?

Why do you want to cover it? IMHO, open-frame is best in that application-
no dead spaces to hide leaks and rot, or provide housing for animals.
Promotes a cooler porch, since no super-heated dead space to act as a
radiator till midnight. And you can even hang an electric fan, if there is
enough headroom.

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