What is the correct method for repairing a cracked Rib

by Ben
(Ireland)

Hi All,

What is the correct method for repairing a cracked rib.

It needs to stand up to a survey.

What we have done so far is to remove the cracked section of the existing rib, (6'' each side) scarfing the ends.

Then laminated marine ply in position gluing with Balcotan Poyleuthene glue.

Fixed in position with copper nails and roves as built day one.

Is this O.K?
Thanks

Ben

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Apr 17, 2012
Cracked Rib Repair
by: Mike

Hi Ben,

If you have a look at one of the
WoodenBoat Series of Books
"Frame, Stem & Keel Repair" you will find an article on using a similar technique to repair cracked ribs.

You can get a preview on Google books, scroll down to page 59.

In my opinion this method of laminating is much better and neater than sistering.

However, it is normal to laminate thin slats of wood with the grain running along the direction of the rib.

With plywood the grain of all the intermediate piles (layers) runs at right angles to the outer layers.

Whether it will be strong enough will depend on how much stress it has to take and how much of that stress is being transferred to the adjoining frames.

What the surveyor will think of it will depend on how much he knows about wooden boats, these days most only know about plastic variety.





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