Tips For Deck layup

[holorinhal]

I would like to hear opinions on the best method to go about relaminating this deck.

Here is a picture of the deck that needs to be laid up and a picture of what it needs to look like.
Notice the two rigglets that run up the center. I would also like to add a thnin 1/4 " piece of ply core to the under deck for stiffness, because the glass is only 1/8" thick.

[gonzo]

A foam core can be lighter. To make those riblets, glue two strips over whatever core you use.

[holorinhal]

Should the layup be done from the inside or the out side?

[holorinhal]

so I guess I will try to put a piece of thin plexiglass coated with PVA under the deck and lay up from the outside,

[tunnels]

Make the unside panel out of fibre glass and pre install a core to it instead of using plexiglass to make a former . Epoxy the panel to the underside of your existing deck all round the edges 360 degrees ! a minimum 50 mm glueing surface . Fair up the foam core then glass the outside and finish how ever you want to!!, Remember the thicker the core the more ridged it will be , A single layer of 600 gram triaxle glass each side done with epoxy would be heaps strong enough make sure the foam is H 80 grade not lower !!

[holorinhal]

The fiberglass hull thickness is 1/8" thick and the plan is to gellcoat the hull .
So If I am doing the lay up from the outside, working with the first layer against the mold mounted on the uderside of the deck and working outward, What laminate schedule should be used?
Should I start with mat and alternate cloth and mat, finnishing with two layers of mat on the very outer layers? Or should I start with woven cloth,alternating cloth and mat and finnishing with two layers of mat? to build to 1/8 it shouldnt take more than 4 layers should it?...Hal