2 oz would be strong enough, for weight savings it will save a little resin, not much, and a little in cloth weight , if you are looking to shave every ounce it could be ok. I would use thinnner wood and build internal stringers composed by foam ribs covered in glass. If you build the internal stifeeners in a web fashion keeping the ribs diagonal it will be really stiff. this is for the racing shell.. used for racing, a kayak used for just kayaking would be sort of delicate built that way. My 2cents

: I'm preparing to build an 18' x 21.6" strip kayak and an 18.5' strip
: USCA spec C1 racing canoe this winter. Excluding the affects of rocks
: scraping the glass, is 2 ounce/yard cloth strong enough when applied to
: interior and exterior? I will reinforce the bow and stern areas and any
: through-bolted points. My main concern is the canoe C1 shape having
: adequate stiffness using 1/4" strips. Additional interior bracing is
: not a problem.
: Thanks, Steve.