floor material

[crum731]

Hello all,

Is there a recommended material to use when replacing a floor in a fiberglass boat (perpendicular cross-member)? It needs to be roughly 2" wide and since it runs perpendicular (it's not a stringer), it follows the side-to-side contour of the boat, which is quite a fancy cut. This is for an old trihull. Will solid wood do?

[Dutch Peter]

Originally Posted by crum731

Hello all,

Is there a recommended material to use when replacing a floor in a fiberglass boat (perpendicular cross-member)? It needs to be roughly 2" wide and since it runs perpendicular (it's not a stringer), it follows the side-to-side contour of the boat, which is quite a fancy cut. This is for an old trihull. Will solid wood do?

YES, but when the floor originally was a grp-floor why not replace with a grp-floor.
Use high density foam, easy to shape, and overlaminate. See attached pdf.

For dimensions in drawing:

tw = .025dw + 1.1 / (1.3fw + 0.61)

tw = thickness of web.
dw = unsupported web depth.
fw = fibre content, by weight, of web laminate.
by playing with dw and fw you can detemine tw (shear tie not always needed!!!).

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[Danielsan]

I'd use the same method as Dutch Peter

But I would put some wooden floor, fix it by glassing it, put some holes in the wood
fill it up with liquid PU foam let it boil out and just just cut away the foam that came out of the holes. Glass over the whole floor and you get a nice flat floor. I think!?!

Don't forget to put pimer on the wood before glassing.

Daniel Peeters

[Dutch Peter]

Originally Posted by Danielsan

But I would put some wooden floor, fix it by glassing it, put some holes in the wood fill it up with liquid PU foam let it boil out and just just cut away the foam that came out of the holes. Glass over the whole floor and you get a nice flat floor. I think!?!

I don't see the use of the holes in the wooden floor, Daniel? I believe you think we're talking about a walk-on floor, while we're discussing part of a transverse single bottom structure

Originally Posted by Danielsan

Don't forget to put pimer on the wood before glassing.

You don't want to put primer on the wood, just pure resin to make sure the first layer will stick.

[Danielsan]

Oh damn right, I'll take it back sorry

But the thing on the primer should be correct when using polyester resins, because the wood, would suck the styrene out of the resin and result in a bad hardner to resin ratio.

Greetz

Daniel