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Old 09-10-2011, 09:10 PM   #1
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Talking grp sandwich

hi all

i need to put a hard roof on the aft deck of a motor yacht as light as possable

i was thinking along the lines of a 4mm marine ply foam sandwich i will have a 2" curve over 1.6 mtrs .... there will be 3 panels 1.6x3.6mtrs which bolt together

i have a vacumm press too

any idears on the best way to construct and materials to use
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Old 10-10-2011, 11:42 AM   #2
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Country: Guernsey Channel Isles
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I used 9mm marine ply on the roof of my tremlett with a long scarf join 1 in 12
Epoxy glued the deck and scarf what a joint !
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Old 10-10-2011, 03:08 PM   #3
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If you're after a wood finished look do as Big dutch said and scarf some ply together with epoxy. If you want to reduce weight and keep stiffness over the span. Lay up a layer of 400g cloth on the rear and bond it to some plascore honeycomb. 18/20mm and either lay glass up on the inside or repeat the outer skin inside.

If its going to be painted just lay glass up on each side of the panel. You could build a mould to include your camber and face it with laminate/formica. This will reduce 99% of your finishing work.

Lots of ways to do this depending on the finish you require.
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