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Post by greenman on Feb 29, 2020 5:21:33 GMT
I've removed the seating which was fitted in the bow cabin and found that the wood behind it was damp and mouldy.
On removing that I've found that the underside of the bow well deck, which houses the fresh water tank, has no insulation with condensation dripping off the top and sides.
I assume it's been like this since new.
There's limited space to fit insulation, I'm thinking of insulating the water tank and maybe glue spare expanded polystyrene I've got in my loft to the top of the space. Any ideas for what I could use on the hull sides would be appreciated.
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Post by Isambard Kingdom Brunel on Feb 29, 2020 5:30:36 GMT
Very difficult to stop all condensation on a cold water tank or an un-insulated hull side.
If you find a good solution let us all know.
I ran a hot heating pipe through the pump space behind my integral tank but with a separate tank as you have, a big problem.
A bit of colour in your day. Just too early......................
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Post by greenman on Feb 29, 2020 5:38:57 GMT
Very difficult to stop all condensation on a cold water tank or an un-insulated hull side.
If you find a good solution let us all know.
I ran a hot heating pipe through the pump space behind my integral tank but with a separate tank as you have, a big problem.
A bit of colour in your day. Just too early...................... That's a lot of colour this early in the day. I'm thinking of buying one of those cold water tank insulating jacket you can get in B&Q and adjusting it to fit the tank. Unless someone has a better solution. Are you still being a British Gent in foreign lands. |
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Post by Isambard Kingdom Brunel on Feb 29, 2020 6:04:33 GMT
Very difficult to stop all condensation on a cold water tank or an un-insulated hull side.
If you find a good solution let us all know.
I ran a hot heating pipe through the pump space behind my integral tank but with a separate tank as you have, a big problem.
A bit of colour in your day. Just too early...................... That's a lot of colour this early in the day. I'm thinking of buying one of those cold water tank insulating jacket you can get in B&Q and adjusting it to fit the tank. Unless someone has a better solution. Are you still being a British Gent in foreign lands. Still out East of civilisation, trying to be a gentleman in the badlands. Doing the BJ biddings'. |
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Post by Deleted on Feb 29, 2020 8:20:41 GMT
I've removed the seating which was fitted in the bow cabin and found that the wood behind it was damp and mouldy. On removing that I've found that the underside of the bow well deck, which houses the fresh water tank, has no insulation with condensation dripping off the top and sides. I assume it's been like this since new. There's limited space to fit insulation, I'm thinking of insulating the water tank and maybe glue spare expanded polystyrene I've got in my loft to the top of the space. Any ideas for what I could use on the hull sides would be appreciated. There are other bigger kits but the price makes your eyes water. I'd wait for a hot day. www.abbuildingproducts.co.uk/touch-n-foam-15-kit-complete.html |
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Post by Gone on Feb 29, 2020 11:50:47 GMT
I've removed the seating which was fitted in the bow cabin and found that the wood behind it was damp and mouldy. On removing that I've found that the underside of the bow well deck, which houses the fresh water tank, has no insulation with condensation dripping off the top and sides. I assume it's been like this since new. There's limited space to fit insulation, I'm thinking of insulating the water tank and maybe glue spare expanded polystyrene I've got in my loft to the top of the space. Any ideas for what I could use on the hull sides would be appreciated. There are other bigger kits but the price makes your eyes water. I'd wait for a hot day. www.abbuildingproducts.co.uk/touch-n-foam-15-kit-complete.htmlI thought that looks interesting until I realised you only get a square meter for £40 |
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Post by TonyDunkley on Feb 29, 2020 12:03:24 GMT
I've removed the seating which was fitted in the bow cabin and found that the wood behind it was damp and mouldy. On removing that I've found that the underside of the bow well deck, which houses the fresh water tank, has no insulation with condensation dripping off the top and sides. I assume it's been like this since new. There's limited space to fit insulation, I'm thinking of insulating the water tank and maybe glue spare expanded polystyrene I've got in my loft to the top of the space. Any ideas for what I could use on the hull sides would be appreciated. If you could arrange some ventilation for the compartment under the forard well deck you would find that will be at least, if not more, as effective as insulation. |
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Post by Deleted on Mar 1, 2020 7:11:07 GMT
I thought that looks interesting until I realised you only get a square meter for £40 Maybe that's not the kit for you but any other sort of insulation is just building in more problems for later. As gets said a lot around here, the internet is your friend. Pay someone who does it for a living? |
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Post by JohnV on Mar 1, 2020 7:46:04 GMT
I haven't said anything before but to me it sounds as if there are actually two problems. 1) lack of ventilation in the well deck space 2) lack of insulation/vapour barrier between cabin bulkhead and well deck the condensation in the well deck and on the water tank has to be caused by warm moist air and a temperature differential and/or lack of ventilation in the well deck space. I can only suggest how I would tackle it. First the well deck needs to be separated from the cabin by a sealed insulated bulkhead to prevent warm air entering from that source. The well deck (which I presume is uninsulated) should have it's own independent ventilation (maybe raised on a pipe to just below gunwale level, one to port and one to starboard. I personally wouldn't bother insulating the tank, if you remove the source of warm moist air and ventilate properly, condensation should be much reduced and should also dry quickly and naturally. replace the ply behind the seating (in fact all across the end of the well deck) with a sealed insulated bulkhead with any joints well taped with foil tape that should, if not cure, certainly reduce the problems and also help with heat loss. I have spent a lot of time learning to fight condensation and I have found that insulation without a vapour barrier or a vapour barrier without insulation just moves the problem and doesn't cure it and also that the better you insulate the worse the condensation gets on the bits you didn't do properly the first time round  Good luck greenman |
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Post by Deleted on Mar 1, 2020 8:12:10 GMT
If you have the option to get welding done then a very effective item to use as a ventilator is a weld-on handrail elbow. Or Butt Weld elbows used for pipework they make excellent vents on boats. Not expensive for the handrail type. I'd be tempted to get a couple of the 88.9mm ones welded on somewhere to get the air flow going. www.fhbrundle.co.uk/groups/25WE__Weldable_Elbows_TeesNice to have it all in steel then the whole lot can be painted and look nice and tidy. You do want to clip grates over the end (I used disposable barbecue grids) as it is a potential entry point for rodents which is a bit of a nuisance. |
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Post by greenman on Mar 1, 2020 10:06:16 GMT
Thanks for the replies.
The set up as was, the seat/pull out bed had a large space underneath it and the boarding between the cabin and the well deck had a 'ventilation gap' measuring about 1 1/2 ft x 1ft. There's no other source of ventilation for it so guessing this has been the main source of the problem.
If I insulate and seal the bulkhead like you've suggested how wide roughly would my vents need to be, I'm thinking I could run pipes in the gap between the inside woodwork and the cabin walls and make a small vent hole either side of the cabin door.
I'm back at the boat on Tuesday so will investigate further and ponder over many beers and a few whiskys.
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Post by Jim on Mar 1, 2020 10:56:18 GMT
The foil bubble insulation might work, easy to cut up and stick, seal gaps with gaffa tape. Plus doing all the other stuff.
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Post by JohnV on Mar 1, 2020 11:00:27 GMT
I'm back at the boat on Tuesday so will investigate further and ponder over many beers and a few whiskys. not knowing your particular layout, I'm not sure ...... however if you are going to do it on the inside coming through the new bulkhead and up and through either side of the door you might want to have a look at doing it in the nominal 4" x 2" plastic box ventilation ducting as it comes with a huge range of bends, square vents, square to round adaptors and round vents etc ..... from B&Q, Screwfix et al. Personally I would go for steel welded in ..... but then I have a welder and a not smart boat  . It depends on exactly where but if the vents are too close together you might reduce the draught ..... possibly you could put the vents in the bulkhead* at different heights? * I mean the new insulated bulkhead not different heights next to the door |
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