Where to use carriage bolts

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Where to use carriage bolts

Post by LThomas » Fri Sep 28, 2012 7:10 am

Starting to build the Barrelback 19. Fastening schedule says 2 ea carriage bolts at each junction of frames. Frame plans don't show them nor are they mentioned. No problem where the frame is a lap joint at the sheer. That gets bonded and bolted. My question is at the chine and keel frame joints where the frame is lapped with ply doublers. do they also get bolted through the ply? or bonded and nailed? Thanks

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Re: Where to use carriage bolts

Post by jprice » Fri Sep 28, 2012 10:18 am

I can't see why you would need carriage bolts for the plywood gussets on the frames. Seems like serious overkill. Screws or nails, and epoxy is more than enough.

The only place where carriage bolts were used on my frames (not a barrelback, btw) was to bolt the frames to the stringers.

Do the blueprints show any details on the bolt locations?

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Re: Where to use carriage bolts

Post by Bill Edmundson » Fri Sep 28, 2012 10:43 am

The blocks from frame to the motor stringers are attached with carrage bolts on the Tahoe. I'll bet KH did it the same way on the BB.

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Re: Where to use carriage bolts

Post by galamb » Fri Sep 28, 2012 3:18 pm

Carriage bolts are prominently noted many times in "boatbuilding with plywood" - which also talks about using resorcinol glue (which was never strong enough to use by itself or with (lesser) fasteners that can be used with modern epoxy).

If using epoxy you are probably more than safe skipping the bolts on the frame junctions, but if you will sleep better at night with them there, go for it.

As Bill states, the motor stringers - possibly any "knees" in the transom area and the stem/keel junction (if applicable - really the highest stress places) could still benefit from bolts...

Yes, Plywood is "real" wood :)

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Re: Where to use carriage bolts

Post by falconer100 » Tue Oct 23, 2012 4:28 pm

On my Barrelback plans, bolts are used for the frame blocking to motor stringers (two each way, so four in total on each blocking) and the keel to stem junction (you need three here). I also used bolts for the inner transom to uprights, two each side.

Hope that helps.


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