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					Originally Posted by  scook
					 
				 
				I'd brace it up so there's at least some hump in it - you don't want puddles on your deck. 
			
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 I understand. I was thinking the same thing, but can't figure out how to do it, unless I glue the plywood up first and then glass the cross supports in place. Even then, will there be enough flex in the plywood to raise the centre line a bit after it's glued to the top?