Last winter, our first, proved one thing; it gets wet in the cabin overnight when it’s cold outside and there are people breathing on the inside. It’s a problem which needed sorting before our second winter.

The Cornish Yawl has a quarter berth, or junk berth. Ours is a junk berth for the obvious reason, but, you know, if it could be made snug and warm it might just be a place to sleep, especially as the cushions are deeper! It’s a big hole directly beneath the cockpit seating on the starboard side, and this seat is just a single layer of GRP, unlike the cabin roof which is double layered. Research led me believe that some closed cell foam should do the trick, so this last weekend I’ve been down in Mylor to sort it out. I managed to do most of it, but the remainder will have to wait until New Year.

Here’s how it was. The manky area top right is the underside of the starboard cockpit seating. Far right is a hardboard panel which I removed, along with the panel top right, which I removed to see what was above it and couldn’t get it to go back.

IMG_0316Here’s what it looks like now..



The other areas which needed attention are the ones behind the slats in the cabin. The next few images show the sequence; first ones showing condensation, then with insulation applied, then the finished item.

IMG_2688 IMG_2689 IMG_2691 IMG_2692All that remains to do is the area behind the galley, and the top surfaces of the cave lockers, and then we should have a toasty warm boat for winter use!

And whilst I was doing all this work it was one of the best weekends of the last few months.





2 thoughts on “Condensation

  1. Really interesting Russell. The photos say it all. The far end of the quarter berth has been a mould site on Nellie B also, although I’ve not had a problem on the surface directly under the cockpit seat. It has just occurred to me that this is probably because the teak decking is providing the necessary insulation. I’m afraid I’ve never got into Winter sailing, and haven’t experienced the condensation issue caused by all that nocturnal breathing. I do know of a Mk 2 Crabber owner who glued carpet (the kitchen variety) to the hull behind all his wooden panels, and it worked well for him. I look forward to the next instalment after a Winter weekend aboard.

    Best wishes,


  2. Cheers Steve. There was mould on much of the quarter berth, but it cleaned off easily. I’d considered carpet, but the foam under carpet is open cell, so it doesn’t keep the cold out, and soaks up the resulting condensation, so, in effect, it masks the problem for a later date. We’re down again over New Year, so will finish the job then, and give it a good test.

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