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Old 08-29-2017, 12:07 PM   #1
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What kind of rot is this?

Hello All-

I have a 42' 1956 Chris Craft Constellation. I have been noticing some kind of deterioration along the ribs in the engine room. Photo attached. What is causing this and how to prevent? The boat is kept in a covered slip in the water year round in Virginia. There is no fresh water penetration into the affected area. There is no other rot in the usual places, around windows or decks. The boat is generally in top condition.

I've owned wood boats in the past, so I am familiar with dry rot caused by fresh water. Usually, the entire wood piece is permeated with the rot, and an ice pick can be pushed all the way in. The rot in this case is different. It's only on the surface, and appears to be a kind of "shredding" or "fuzzing" of the outer surface of the wood. The layers below are solid. Therefore rot caused by water or condensation is not my first thought but I'm wondering if it might be caused by some kind of electrical condition - electrolysis, or stray DC current grounding out, or even neighboring boats putting out current into the water, etc. but I need an expert's advice. And it has occurred quickly - over the course of a winter. Any thoughts about this?

Many thanks
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Old 08-29-2017, 12:13 PM   #2
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Is that a marine/mahogany plywood hull? I once owned a 1965 28' CC that had the ply hull - CC used it between lapstrake and fiberglass eras. Could it be from the glue from the layers of ply?
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Old 08-29-2017, 12:45 PM   #3
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If the boat is in salt or brackish water, it is a weeping salt rot.
The water slowly weeps through that area, dries and leaves behind salt crystals which fray and cut the wood fibers.
If that is true, it is a very very slow leak. If you can keep the moisture from coming through the wood and drying, then the problem will cease.

I would scrape off the loose fibers, and seal it with epoxy or paint.
If you scrape it down, and it is damp, try drying first with a heat gun, before sealing it.

I don't see any thru hulls around that fuzzing wood, so I doubt it is electricity.
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Old 08-29-2017, 01:23 PM   #4
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Old 08-29-2017, 02:58 PM   #5
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Thanks for the replies. There's no plywood, so that's not a factor. But sdowney, your ideas are very interesting and could be the answer. The boat is in brackish water, off the Potomac. The damaged area is right at the waterline, actually a couple of inches above, but water can be seeping through and doing what you describe. If it was scraped down and sealed with epoxy on the inside, do you think that would stop the process, even if there was still some seepage? Or would it be necessary to find the infiltration point on the outside and seal that? The paint on the hull is 7 years old and due for renewal - doesn't look too bad, but I'm wondering if this could be a factor in allowing water to infiltrate. Thanks so much.
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Old 08-29-2017, 03:01 PM   #6
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Post on the WoodenBoat Forum. Email Dr Jaegels at WoodenBoat.

Examine the rest of the hull for similar appearance.

How long has it been since you last looked there?
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Old 08-29-2017, 07:31 PM   #7
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Quote:
Originally Posted by jrusk View Post
Thanks for the replies. There's no plywood, so that's not a factor. But sdowney, your ideas are very interesting and could be the answer. The boat is in brackish water, off the Potomac. The damaged area is right at the waterline, actually a couple of inches above, but water can be seeping through and doing what you describe. If it was scraped down and sealed with epoxy on the inside, do you think that would stop the process, even if there was still some seepage? Or would it be necessary to find the infiltration point on the outside and seal that? The paint on the hull is 7 years old and due for renewal - doesn't look too bad, but I'm wondering if this could be a factor in allowing water to infiltrate. Thanks so much.
Yes, it will stop it completely, if you seal the inside wood surface.
Preventing the weeping water intrusion and then it drying on the surface to form salt crystal which cut the wood, is the ultimate goal.
On a haulout, look at the exterior, you may need to recaulk. You may also have a cracked plank.
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Old 08-29-2017, 11:08 PM   #8
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There's only one kind of rot. rot.

What you have is not rot but some kind of critter like ants.
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Old 08-30-2017, 02:15 AM   #9
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Critters like BORER?
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Old 08-30-2017, 02:26 AM   #10
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Steve,
Yes maybe flying ants.
just a guess.
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Old 08-30-2017, 06:03 AM   #11
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I had a similar looking "rot", my hull is Cypress. It ended up being a slow leak from a keel cooler bolt that worked it's way out and broke. After the trip to the yard they replaced all the bolts and now the problem is fixed, I also had a few bad fiberglass repair jobs that were leaking very slow. All fixed and zero moisture invasion. We are finally putting another coat of paint on this week.
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Old 08-30-2017, 06:26 AM   #12
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Looks like some type of wood fungus. You can remove the loose fibers and treat it with anti-freeze to kill the fungus. Let the ethyl glycol saturate the wood fibers then rebuild with epoxy.
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Old 08-30-2017, 06:53 AM   #13
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Agree its a fungal rot it can be stopped and repaired using "West Systems " epoxy buy drilling 100s of small holes and injection with epoxy in a syringe when mixed correctly it will have the consistency of water.
This will penetrate the timber and form a hard workable area .
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Old 08-30-2017, 12:53 PM   #14
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Not all antifreeze is ethylene glycol. In my experience the 50/50 mixture works as well as 100%.
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Old 08-30-2017, 04:25 PM   #15
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Quote:
Originally Posted by CaptSteve53 View Post
Critters like BORER?
https://en.wikipedia.org/wiki/Eastern_carpenter_bee
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