Comparison of Core Materials

[65Bowrider]

I found this article by West System very interesting,
comparing core materials of XL plywood, Okoume Marine plywood, balsa, and core cell foam ... weights, cost.

http://www.westsystem.com/ewmag/23/p...lat_panels.pdf

I've heard of XL plywood before, how it is kiln-dried & very rot resistant. Has anyone used/worked with XL plywood?

Giving consideration to which type of materials to use for bulkheads, cockpit sole, decking, etc.

[65Bowrider]

No one's heard of XL-10 plywood/panel?

[McGillicuddy]

That is an interesting article. I may also be replacing the bulkhead on my Seafari and I had only considered marine ply -- just hadn't yet decided to go teak, fir or a mahogany variant. I think the XL panel is made by Greenwood Lumber or similar. Not familiar with XL-10 but I think the Greenwood stuff was doug fir plys treated with copper chromate (same stuff they use for treated lumber) and exterior grade glue/epoxy? I think for the bulkhead or floors (if wrapped in resin) it would be fine. Price is certainly favorable.

[gofastsandman]

XL is treated w copper, chromium and arsenic. Think P.T lumber. Some use oil based glue which is not compatible w poly. Don`t know about epoxy.
Are you using poly or epoxy?
gfs