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Old 20 July 2010, 17:22   #1
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Rotten decks, why so frequent? How does it occur?

Why is it you see so many posts from people who go and see what look like decent boats, only to find from a survey they have a rotten deck?

Why and how does it occur?
What can be done to stop it?

Bought an ex demo Humber and it sits on a mooring, any issues or things I should look for?. The 5.4 SR sat on it for 12 yrs and that never rotted despite being swamped a good 3 times when the bilge packed in!
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Old 20 July 2010, 17:26   #2
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At a guess, if it's not from a poor initial build it'll be from screws/bolts going into the deck not being sealed properly.
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Old 20 July 2010, 17:30   #3
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As Nos said, deck fittings not been sealed properly is probably one of the biggest causes.
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Old 20 July 2010, 17:31   #4
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Yep.It's why I parrot on at people about using Sikaflex or the equivalent rather than silicone sealer.
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Old 20 July 2010, 17:33   #5
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Well....

Photo from new build. Two holes used to fix plate. Two "spare holes" left unsealed and just hidden with the plate.
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Old 20 July 2010, 18:07   #6
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Originally Posted by Sprayblond View Post
Photo from new build. Two holes used to fix plate. Two "spare holes" left unsealed and just hidden with the plate.
New build by.....?
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Old 20 July 2010, 18:49   #7
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Why is it you see so many posts from people who go and see what look like decent boats, only to find from a survey they have a rotten deck?
Do you really see a lot of boats with rotten decks?
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Old 20 July 2010, 18:54   #8
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Being fair I have never seen a rotten deck. However I recall about 4 cases of posts with people looking for boats who have been to see ones that look fine but surveys show a rotten deck. Also a few posts with rotten transoms. Thought I'd ask the question to check I don't do anything to ours over the long term.
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Old 21 July 2010, 02:02   #9
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it would also seem that moisture can get into the deck from the underside of the deck....

water that sits in the hull compartments forms condensation on the underside of the deck, and if the deck is not made properly then this moisture will be absorbed into the wooden deck.

this is really why all decks should be made on a mould and fully encapsulated in glass, then the plywood structure is protected from moisture.

i have also seem alot of 'silicone' sealants used, which are great for your bathroom, but really a sikaflex or saba type marine bedding compound sealant should be used, they can deal with the marine environment far better
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Old 21 July 2010, 03:45   #10
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Are modern Humber decks made in a mould and glassed?
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