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adhesive for wall sheathing on houseboat?

11/16/13       
james

I'm building out a mini houseboat on a 26ft JC Craft Tritoon. stick frame construction/OSB T-111 siding, interior walls are 1/4" shop ply laminated with FRP Panels (I have "Green Choice" FRP adhesive made by Franklin/Titebond for the FRP skinning, but can exchange for another FRP adhesive if anyone has any opinions or experiences to share that might suggest doing so...)
My main question however, is regarding the 1/4" to sheathing assembly, and the T-111 OSB installation (which is already installed)
I have about 10lbs of weldwood "Brown" glue that needs to be used, and was considering using this to glue the 1/4" to the framing. but brown glue is the pinnacle of "rigid glue line" IMO, and I am not sure if allowing NO flex is sound in theory???
I could use yellow (aliphatic resin), I certainly have plenty of the FRP adhesive to trowel the studs prior to screwing the 1/4" on, and of course -no glue at all is a possibility!
the structure is simply a box that takes up most of the 26x8ft deck, 24" centers 2x4 walls + SYP 2x6 joists overhead, as top deck will be used. I know cabinets and stairs + conventional residential construction, and while I have built a couple boats, I am far from what I'd consider a boat builder, much less an aeronautical engineer. Power is a V6 Mercruiser, and calculations suggest 25+knots, so I would like to pickup as much structural integrity with as little weight addition as possible. -as for whether I should/shouldn't glue the interior or exterior sheathing + what adhesive/s to use -Any suggestions, advice or opinions would be greatly appreciated,

11/19/13       #2: adhesive for wall sheathing on hous ...
Keith Newton

James, I think I would use some sort of flexible marine type adhesive which you can get in a caulking tube, like a polyurethane.

With that much power and speed, there will be lots of flexing of hull, which would destroy mechanical fasteners eventually.

You can certainly find what you need at West Marine or other boating supply, but I have been seeing some of those adhesive/caulks showing up in the hardware lumber yards at pretty reasonable prices lately from good brands like Locktite.

11/23/13       #3: adhesive for wall sheathing on hous ...
Jim Baldwin  Member

Website: http://www.handrailer.com

This is not rocket science and your weldwood brown is fine. If you're really worried over flex than go with Franklin type ll or lll. Personally I wouldn't allow or permit any flex between sandwiched layers of wall sheathing (why create squeaks). Liquid Nails and other flexible adhesives will positively let loose.

Hard setting resorcinol was the glue of choice for boat and plane builders since WW ll but now it seems to be epoxy. The Spruce Goose, British Mosquito Bomber, American PT boats, minesweepers and thousands of LLC boats (to name a few) all glued and screwed with resorcinol.


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