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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Delamination.
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Thread: Delamination. Reply to Thread
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Topic Review (Newest First)
07-20-2012 10:11 AM
utchuckd
Re: Delamination.

Thanks Tom. And thanks to your blog I did look under the port settee and yep, rusty tab.
07-20-2012 09:33 AM
tommays
Re: Delamination.



all the wood in this shot is superficial trim



You need to poke all the bulkheads were the SIX chainplates bolt on as they tend to ROT right there and this kind of makes or breaks the deal





It is a PITA to change or repair the bad bulkheads
07-20-2012 09:18 AM
tommays
Re: Delamination.

On the Cal 29 the rust is from the lifting hoops they used to place the lead in the keel

However the other rust is also from the mild steel mast step which is doused with water from the pan drain in the head area, cooler drain and the original leaking mast wires which funneled water directly to to the top of the beam









If you look under the settee by the compression post you will most likely see a big rusty metal tab








The wood deal is endless bow to stern



But all my important stuff was still alive





And IHMP they fall into the boat worth saving IF your up to 2 years or so work
07-19-2012 09:53 PM
boatpoker
Re: Delamination.

Don't see too many Cal's up here in Canada but I think you'll find that the keel is integral to the hull mold, therefore there are no keel bolts but they did have a steel beam for mast compression support and there is a very good chance that it is badly corroded.
07-19-2012 09:42 PM
utchuckd
Re: Delamination.

Cal 2-29.
07-19-2012 09:31 PM
boatpoker
Re: Delamination.

Don't even consider this boat until the glass is removed from the keel bolts and they are closely inspected. Replacing keel bolts on most boats is extremely expensive and and almost impossible on others without replacing the keel. It would help to know what model you are talking about.
07-19-2012 08:23 PM
utchuckd
Re: Delamination.

Thanks all. I did poke around some with my knife and it seemed dry everywhere, but like y'all said,it has been wet at some time. Just didn't know if this was a seal up anything that leaks and repair/replace the wood, or if it was indicative of some larger problem. The chainplates look to have been replaced, so maybe it's already been taken care of.
07-19-2012 08:14 PM
paul323
Re: Delamination.

Delamination is not just fiberglass - it applies to any laminated material (any material where multiple layers are bonded together to form a single unit). Laminated bows, for example, are very common in archery....

But back to your boat. The plywood has been soaked; some of the layers have swollen/shrunk/delaminated, the glue has failed. Plywood which has suffered this abuse rarely returns to its original dimensions, frequently suffers from rot, and generally has lost its structural integrity. Occasionally - rarely - the top laminate layer (veneer) detaches, and as this layer is principally decorative it can be replaced.

The top photo looks like longer-term water penetration, and looks bad.

The other areas may be fixable; in the middle photo it would probably be quicker, easier and more attractive to replace the wooden facia/front. It the third photo (assuming the wood is sound) veneer would probably fix it.
07-19-2012 07:52 PM
smurphny
Re: Delamination.

It does look like moisture damage. Poke around with a small, thin knife to check for rot. If it's "punky" and soft, it's a large problem. If it's just the top veneer that has peeled, I would think about getting some matching veneer and glueing it on, leaving the old plywood. You could also use Git-Rot or similar epoxy (West makes a similar product) if there is a bit of rot and relaminate the veneer.

The rust in that pan may be nothing but residue from something that sat there and rusted. Looks like a pan was glassed in over the bolts. A deeper exam needs to be done to check that the bolts aren't all electrolycized.
07-19-2012 07:42 PM
Jetexas
Re: Delamination.

The boat was probably full of water at some point. Just know you will have to replace all that plywood, and if you don't, it will stink like mildew forever.

I had to do it on my boat, but for the price it was worth it.
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