On Wed, 6 Jul 2011 06:16:43 -0700 (PDT), jamesgangnc
wrote:

Some newer boats
use fiberglass I beams as stringers with no wood at all.

I used to own a boat called a Winner 24. It was a cuddy cabin
runabout built in 1978. The stringers were fiberglass laid over a
foam core and were still like new when I got rid of it several years
ago.