Fiber orientation on hull?

I am laying up some 1708 biax on a sailboat hull. Long story but for a repair the hull will get 100% coverage of one layer.
I want to buy all the hull stiffening I can out of the fabric & am guessing that 45 degree fiber orientation from sheer is about right. This sound correct?

Thanks

 

If you want all the stiffness you can get from equal weight, then drop the 1708 and use 2 layers of 12 oz biax. Same total weight in glass, but its 100% directional glass. the mat does very little for stiffness and will only waste resin. I am assuming your using epoxy, otherwise mat may be necessary.

This would also allow you to go one layer 0/90 then the other 45/45 - now you have bias and double-bias

 

Vectorply offers some very nice quad ax materials. They aren't like the tri-ax of old that were like wetting out carpet, they wet out very well and they offer them in different weights in each of the sewn directions.