Seam at bottom of hull leaking water out of bilge

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14 years 3 months ago #415 by David Groves
Hi All,
We are in the second round of a similar problem on Shamal. Before going to the Bahamas, we noticed water leaking out of the bottom of the keel forward half. It appeared as if a repair had been done, but we assumed that some water was coming in from the bilges. Over the winter, we had a glass expert grind off the bottom and up the sides 6 inches. There had clearly been filler added between the clams of the keel, and no glass layers added over the ? repair. We drilled holes into the keel, cleaned out the foam around the lead, and forced dry heated air through the system several times over the winter to ensure it was dry. Finally the glass person filled one of the holes, I put garboard plugs on the two others, and wrapped three layers of glass (two mat and 1 roving I think) to hold it all together.

After I got back(two years), I opened the garboard plugs and found no water (just a little condensation on the lead). I will post some of the pictures (I can't seem to include them in a discussion message). In any event, we are confident that the water was coming in from the bottom, not down from the bilge.

We are now is second round. Water seeping out in the stern half in the spring of last year as we finished antifouling. I left it alone until the Fall, sanded it off. Same story, prior patch which failed, let water into the glass, delaminated it on the bottom, but water in the glass up six inches. We aren't going to bother with drilling holes (getting near the fuel tanks), but ground out the center bottom on the middle/aft piece, and letting it dry out. We will have it filled and glassed in again, as per the forward section.

I have no concerns about structural integrity, especially with the new wraps. Much better than the old structure/repairs.

Regards

David and Hallie

W42 #321 "Shamal"

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14 years 3 months ago #416 by David Groves
Post Script. The pictures are in a photo gallery under Maintenance, etc./Keel Bottom Repair
DJG

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14 years 3 months ago #417 by David Groves
Hi All,
Thanks for the information Doug. Not prior repair. Probably the gap fill between the clam shells eventually fails, letting water into the shells. Repair should include epoxy waterproofing under the antifoul.

Regards

David

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