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 Norman Boats
 Well My Norman has ...............?
 A bit of a basic question about condesation.
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Tom Morgan

141 Posts

Posted - 06 Dec 2021 :  11:25:43  Show Profile Send Tom Morgan a Private Message  Reply with Quote
My N23 is in the marina for the winter. Because of the galley work surfaces etc being on the right side, the boat leans very slightly to the right when there's nobody on it. And, of course, the roof slopes downwards toward the front.
The ceiling is cladded in narrow tongue-and-groove strips, fixed to battens. |I'm not sure what insulation is between the woodwork and the ceiling, if any.
From the front right of the ceiling, I'm getting a few drips from the tongue-and-groove.
Could this be condensation on the GRP ceiling, running to the lowest point and dripping off?
Do you get condensation on any empty boat?

df

United Kingdom
5984 Posts

Posted - 06 Dec 2021 :  13:26:18  Show Profile  Visit df's Homepage Send df a Private Message  Reply with Quote
It can be condensation but worth having a good look around roof vents and handrails for possible leaks, ventilation is the best way forward to prevent.
I had tougue and groove headlining on my RLM and that had a few damp spots.
It's been fairly mild so far and warmer air carries more moisture than cold, once the temp drops the air can no longer hold onto the vapour so it condenses out (which kind of messes with the ventilation theory a bit), pots of salt can absorb a lot of water from the air.

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Tom Morgan

141 Posts

Posted - 06 Dec 2021 :  21:17:16  Show Profile Send Tom Morgan a Private Message  Reply with Quote
Thanks for your thoughts, df. As soon as the weather allows, I'll remove and re-seat the handrails on the roof and the mushroom vent. There are the only places which involve holes in the roof. It's only a few drips, maybe half a cup in a fortnight, but it's never happened before in the three years I've had the boat. I already have a dehumidifier on the boat but will invest in another, I think. Thanks again.
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Mad Harold

United Kingdom
217 Posts

Posted - 09 Dec 2021 :  12:43:43  Show Profile Send Mad Harold a Private Message  Reply with Quote
A leak from the roof rails or air vents is the most likely cause.
I get condensation on the inside of the vinyl canopy in wet weather with the heater on.
Normally when left there is no condensation in the cabin,except when there was a weep from one of the screws holding the rubbing strip on.
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Tom Morgan

141 Posts

Posted - 11 Dec 2021 :  23:08:44  Show Profile Send Tom Morgan a Private Message  Reply with Quote
Thanks, MH. This is a new leak, so I plan to remove and refit everything on the roof. I'll be over there tomorrow to check the situation.
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cliveshep

Thailand
1324 Posts

Posted - 29 Dec 2021 :  12:10:12  Show Profile Send cliveshep a Private Message  Reply with Quote
I used to leave the windows open on my Ocean 30 but covered it stem to stern with a 40ft polytarp from Travis Perkins weighted down with 4 litre water-filled milk bottles suspended with the elastic scaffold sheet bungee ties so no wind movement would exert sharp forces. Never had any problems with through draughts keeping inside sweet.

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Finally living the dream!

Edited by - cliveshep on 29 Dec 2021 12:14:16
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