Re: Combine board and batten and molded plywood constrution

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brigjeff
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Combine board and batten and molded plywood construction

Postby brigjeff » Tue Jun 19, 2018 7:54 am

My son and I purchased a 20' runabout that had the bottom, deck and transom planked with board and batten construction. The hull was not planked. The boat is probably a 1930's kit boat from upstate NY, framed with oak. It was powered by a Universal 6 cylinder. The bottom was rough and we replaced it with 5200 (plywood and mahogany planks). We found that planking the hull is beyond our capabilities and contracting the work is +/-$20K, far beyond the value of the boat when completed. Is it possible/wise to complete the boat using molded plywood construction on the hull?

Thanks,

Jeff
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Last edited by brigjeff on Tue Jun 19, 2018 8:20 am, edited 1 time in total.

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Bill Edmundson
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Re: Combine board and batten and molded plywood constrution

Postby Bill Edmundson » Tue Jun 19, 2018 8:07 am

Jeff

The frame looks a lot like the Tahoe frame at the bow. I looks like a cold mold approach would work well. There is a lot of experience with CM here.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

PeterG
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Re: Combine board and batten and molded plywood constrution

Postby PeterG » Tue Jun 19, 2018 8:38 am

Cold molding the planking will work great on your hull, and it'll be structurally strong. You need to determine the thickness of the original planks, then divide that into 3 to get the thickness of the layers you will apply. You can use the methods shown on the boats here with two alternating layers of thin plywood topped with a layer of mahogany for appearance, or even use all mahogany layers. I highly recommend getting the Glen-L book on cold molding.
Murphy's Law: Anything that can go wrong, will go wrong.
Griffin's Law: Murphy was an optimist.

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Jimbob
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Re: Combine board and batten and molded plywood constrution

Postby Jimbob » Tue Jun 19, 2018 9:02 am

Hi Jeff,
As others have suggested, I would go with the cold molded process. It's easy to do, and not expensive.
My hull is 3/8" thick. Two layers of Joubert 3mm (1/8") Okoume plywood. The final planking was done using 1/8" mahogany veneer. A couple of pictures below.
Plenty of help on the forum if you need it.
Jim
Attachments
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The plywood layers with the start of the mahogany veneer.
P7130140.JPG
The first plywood layer going on.
Jim Neeley
Building a Barrelback in Sacramento, CA
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brigjeff
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Joined: Tue Jun 19, 2018 6:04 am

Re: Combine board and batten and molded plywood constrution

Postby brigjeff » Tue Jun 19, 2018 9:04 am

Thank you for the input.

Jeff

GL3z
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Joined: Sun Sep 16, 2018 8:48 am

Re: Combine board and batten and molded plywood constrution

Postby GL3z » Tue Sep 18, 2018 12:48 am

how's the progress on this?


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