Thanks to K and Wayne.B for helpful advice

Wayne.B wrote in message . ..
On 2 Feb 2005 23:34:21 -0800, (teddyareno)
wrote:
Is 1/4 inch (6 mm) plywood, glassed over, adequate for a non
load-bearing, hard canopy for my little cruiser? The canopy will be
about 9ft long by 6ft wide, and slightly curved for water run-off and
aesthetics. How many layers of fibreglass cloth would be needed?

I intend to force the plywood into shape and allow the epoxy and
fibreglass to keep its shape when dry.

I'm trying to avoid rafters as they eat into the avilable height.
=================================================

I would suggest reposting your question on group 'rec.boats.building'.

There are a number of people on that group who fabricate fiberglass
parts of various sorts. I agree with K that you are not going to get
the kind of panel stiffness you want with 1/4 inch ply unless you
glass it very heavily, but there are other alternatives such as 3/4
inch foam that might work out with the proper fiberglass layup on each
side. I disagree with K regarding the use of Chopped Strand Mat as a
reinforcing material. CSM is very weak for its weight and is mostly
useful for adding non-structural thickness to a layup. Woven glass
cloth or unidirectional has much better stiffness and structural
qualities.