We have a few places on our small boat which suffer from serious
condensation. They are basically the few places where there is just a
sheet of metal (4mm thick) between outside and inside. On these
places inside, especially now in the winter, it runs with water.

Will 'anti-condensation paint' help or do I need something more like
some sort of plastic foam insulation. I don't want to stick expanded
polystyrene there but some sort of flexible stick on foam would be OK.

--
Chris Green
·

On 16/12/16 12:12, Chris Green wrote:
We have a few places on our small boat which suffer from serious
condensation. They are basically the few places where there is just a
sheet of metal (4mm thick) between outside and inside. On these
places inside, especially now in the winter, it runs with water.

Will 'anti-condensation paint' help
no.

or do I need something more like
some sort of plastic foam insulation.

yes.

I don't want to stick expanded
polystyrene there but some sort of flexible stick on foam would be OK.

anything that has some kind of decent U value...actually you may be
surprised at how good cork wall tiles are.

I lined a single brick kitchen with them once - hell of a difference.

On Friday, 16 December 2016 10:26:43 UTC, The Natural Philosopher wrote:
On 16/12/16 12:12, Chris Green wrote:
We have a few places on our small boat which suffer from serious
condensation. They are basically the few places where there is just a
sheet of metal (4mm thick) between outside and inside. On these
places inside, especially now in the winter, it runs with water.

Will 'anti-condensation paint' help
no.

or do I need something more like
some sort of plastic foam insulation.

yes.

I don't want to stick expanded
polystyrene there but some sort of flexible stick on foam would be OK.

anything that has some kind of decent U value...actually you may be
surprised at how good cork wall tiles are.

I lined a single brick kitchen with them once - hell of a difference.

Use something impermeable or it'll end up saturating.


NT

On 16/12/2016 10:26, The Natural Philosopher wrote:
On 16/12/16 12:12, Chris Green wrote:
We have a few places on our small boat which suffer from serious
condensation. They are basically the few places where there is just a
sheet of metal (4mm thick) between outside and inside. On these
places inside, especially now in the winter, it runs with water.

Will 'anti-condensation paint' help
no.

or do I need something more like
some sort of plastic foam insulation.

yes.

I don't want to stick expanded
polystyrene there but some sort of flexible stick on foam would be OK.

anything that has some kind of decent U value...actually you may be
surprised at how good cork wall tiles are.

I lined a single brick kitchen with them once - hell of a difference.

When did you last see them on sale though ?. Very 1970's and now cork
flooring has become a bit pricy. The stuff that car manufacturers use
under the bonnet of diesel car might be better.

On Friday, December 16, 2016 at 8:07:26 PM UTC, Andrew wrote:
On 16/12/2016 10:26, The Natural Philosopher wrote:
On 16/12/16 12:12, Chris Green wrote:
We have a few places on our small boat which suffer from serious
condensation. They are basically the few places where there is just a
sheet of metal (4mm thick) between outside and inside. On these
places inside, especially now in the winter, it runs with water.

Will 'anti-condensation paint' help
no.

or do I need something more like
some sort of plastic foam insulation.

yes.

I don't want to stick expanded
polystyrene there but some sort of flexible stick on foam would be OK.

anything that has some kind of decent U value...actually you may be
surprised at how good cork wall tiles are.

I lined a single brick kitchen with them once - hell of a difference.

When did you last see them on sale though ?. Very 1970's and now cork
flooring has become a bit pricy. The stuff that car manufacturers use
under the bonnet of diesel car might be better.

http://www.wickes.co.uk/Wickes-Seale...ack-9/p/620950

On Saturday, 17 December 2016 02:26:54 UTC, Adam Aglionby wrote:
On Friday, December 16, 2016 at 8:07:26 PM UTC, Andrew wrote:
On 16/12/2016 10:26, The Natural Philosopher wrote:
On 16/12/16 12:12, Chris Green wrote:
We have a few places on our small boat which suffer from serious
condensation. They are basically the few places where there is just a
sheet of metal (4mm thick) between outside and inside. On these
places inside, especially now in the winter, it runs with water.

Will 'anti-condensation paint' help
no.

or do I need something more like
some sort of plastic foam insulation.

yes.

I don't want to stick expanded
polystyrene there but some sort of flexible stick on foam would be OK.

anything that has some kind of decent U value...actually you may be
surprised at how good cork wall tiles are.

I lined a single brick kitchen with them once - hell of a difference.

When did you last see them on sale though ?. Very 1970's and now cork
flooring has become a bit pricy. The stuff that car manufacturers use
under the bonnet of diesel car might be better.

http://www.wickes.co.uk/Wickes-Seale...ack-9/p/620950

£12 a sqm for 1/8" thick. Not the cheapest. IIRC The Range does tiles twice the thickness and same price per cube.

But I don't think cork is impermeable, so will fail in this case.


NT

wrote:

On Saturday, 17 December 2016 02:26:54 UTC, Adam Aglionby wrote:
On Friday, December 16, 2016 at 8:07:26 PM UTC, Andrew wrote:
On 16/12/2016 10:26, The Natural Philosopher wrote:
On 16/12/16 12:12, Chris Green wrote:
We have a few places on our small boat which suffer from serious
condensation. They are basically the few places where there is just a
sheet of metal (4mm thick) between outside and inside. On these
places inside, especially now in the winter, it runs with water.

Will 'anti-condensation paint' help
no.

or do I need something more like
some sort of plastic foam insulation.

yes.

I don't want to stick expanded
polystyrene there but some sort of flexible stick on foam would be OK.

anything that has some kind of decent U value...actually you may be
surprised at how good cork wall tiles are.

I lined a single brick kitchen with them once - hell of a difference.

When did you last see them on sale though ?. Very 1970's and now cork
flooring has become a bit pricy. The stuff that car manufacturers use
under the bonnet of diesel car might be better.


http://www.wickes.co.uk/Wickes-Seale...-x-305mm-Pack-
9/p/620950

£12 a sqm for 1/8" thick. Not the cheapest. IIRC The Range does tiles
twice the thickness and same price per cube.

But I don't think cork is impermeable, so will fail in this case.


NT

It would be bad news for wine if it weren't.

--

Roger Hayter

Surely the whole issue is due to the thermal conduction issue. Water as it
cools loses the ability to hold moisture, so any cold surfaces will get
condensation as you breath out and transpire water as sweat.
You have to allow the metal to be cold whilst keeping the warm are away
from it as much as possible.

Paint is not a good idea, a lot of that stuff is only anti condensation in
that it does not start to grow mould or come off, it still is cold and will
still get water on it. You have to have layers of insulation.
Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Chris Green" wrote in message
...
We have a few places on our small boat which suffer from serious
condensation. They are basically the few places where there is just a
sheet of metal (4mm thick) between outside and inside. On these
places inside, especially now in the winter, it runs with water.

Will 'anti-condensation paint' help or do I need something more like
some sort of plastic foam insulation. I don't want to stick expanded
polystyrene there but some sort of flexible stick on foam would be OK.

--
Chris Green
·

On 16/12/2016 10:12, Chris Green wrote:
We have a few places on our small boat which suffer from serious
condensation. They are basically the few places where there is just a
sheet of metal (4mm thick) between outside and inside. On these
places inside, especially now in the winter, it runs with water.


If these are not flat surfaces and you need something flexible the
insulation sold to fit behind radiators might work - so long as you seal
the edges with foam, caulk, frame sealant[1] etc to stop air getting
behind it. Eg www.toolstation.com/shop/p26805 and
www.wickes.co.uk/Wickes-Thermal-Insulation-Foil-Roll-600mmx8m/p/210022

[1] possibly Geocell "The Works" or the like used also to stick the
stuff on - assuming getting the surface dry might be a bit of a
challenge at this time of year
--
Robin
reply-to address is (intended to be) valid

On Fri, 16 Dec 2016 10:12:02 +0000, Chris Green wrote:

I don't want to stick expanded
polystyrene there but some sort of flexible stick on foam would be OK.

You need to get the inside surface warmer than the dew point of the air near it,
and ideally also make sure that no air can get behind the insulation, where
moisture would condense and waterlog the insulation.

I'd doubt that any paint would provide sufficient insulation...

AIUI a foam useful for this are the cheap foam mats sold in a roll, for under
sleeping bags, also called exercise mats, EVA pad, etc. Different thicknesses
available, flexible, closed-cell foam, waterproof.


Thomas Prufer

On Friday, December 16, 2016 at 10:16:06 AM UTC, Chris Green wrote:
We have a few places on our small boat which suffer from serious
condensation. They are basically the few places where there is just a
sheet of metal (4mm thick) between outside and inside. On these
places inside, especially now in the winter, it runs with water.

Will 'anti-condensation paint' help or do I need something more like
some sort of plastic foam insulation. I don't want to stick expanded
polystyrene there but some sort of flexible stick on foam would be OK.

--
Chris Green
·

If you have mains electric buy a small de-humififier and run its outlet into the sink or the heads.

At the least get pelnty of ventilation open.