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Under matress ventilation

Pinnacle

Active member
Joined
6 Jan 2006
Messages
5,201
We have become weary of the need to regularly lift the cushions on the bunks in the boat to allow the damp undersides to air and dry. SWMBO says something must be done.......

Do any of these under-matress ventilators really work? Which is the best one to buy, and why? Would plan to view available options and but at So'ton show.

What does the Panel think?
 

Kelpie

Well-known member
Joined
15 May 2005
Messages
5,901
Location
Over the Sea on Skye
Not sure if this is helpful, but for this year I made a set of slats to go under the mattress. Used 9mm ply and attempted to install it in such a way that it had a convex curvature to it to give some spring. Has certainly cured the problem.
We were going to use bedflex, but fell out with them because of deliery costs.
(Sometimes it's hard to persuade people that the Hebrides is not in another solar system).
 

philip_stevens

Active member
Joined
16 May 2001
Messages
3,852
Location
live near Saint Ives, Cornwall.
We have become weary of the need to regularly lift the cushions on the bunks in the boat to allow the damp undersides to air and dry. SWMBO says something must be done.......

Do any of these under-matress ventilators really work? Which is the best one to buy, and why? Would plan to view available options and but at So'ton show.

What does the Panel think?
If you have a double sized mattress, go to IKEA and get a some flexible bed slats. Got a "Freecycle" set for my boat, and have cut them to size and shape of the berth.
 

fergie_mac66

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Joined
28 Jun 2009
Messages
5,552
Location
south yorks
plastic plasterers egg box!

I solved it on our cat with some stuff that I saw my local plastering friend loading in his van cant remember its name but its inplastic sheets and it looks like an 8egg box for quails eggs its about 3/4 inch thick we put it ude the matteress and partialy around sides it allowes airflow right under and around just to be extra certain we put a cheap thin felt backed carpet tween the mattress and the plastic egg box stuff

will post the name of the stuff when I remember it unless someone else provides the name
edit its thin light and cuts with a stanly knife fitted in it in 5 mins
 
Last edited:

jellyellie

New member
Joined
2 Jan 2008
Messages
645
If you have a double sized mattress, go to IKEA and get a some flexible bed slats. Got a "Freecycle" set for my boat, and have cut them to size and shape of the berth.
I was looking for the 'Like' button but this ain't Facebook... exactly what I did, works a treat. Cost £25 from IKEA.
 

fergie_mac66

Active member
Joined
28 Jun 2009
Messages
5,552
Location
south yorks
kontract 20 post 4 continued

Different types and thicknesses but I used kontract 20

http://basement-living.co.uk/basement-conversion/membranes.html

I got it v cheap as offcut from my plastering friend who was doing a basement at the time

its solved the damp under the mattress problem even when we had 10 days on the boat through that icey spell during xmas new year no condensation under mattress at all
 
Joined
24 Aug 2005
Messages
10,370
Location
Cardiff
Other option is aquire a 8x4 sheet of kingspan insulation and cut it into strips, much lighter and easy to cut to shape and its insulation.Suppose its buoyancy too.Just glue it on with impact adhesive and job done in half hour.
 

Kelpie

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Joined
15 May 2005
Messages
5,901
Location
Over the Sea on Skye
And the added advantage of Kingspan is that you can pee the bed with impunity because nobody will notice the smell :D
 

Quandary

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20 Mar 2008
Messages
7,962
Location
Argyll
The copious quantity of moisture exuded by the human body has to go some where, insulation just means it stays hidden in the mattress rather than condensing on the bed base. The best solution is developing the habit of raising the bed cushions for maximum ventilation as often as possible, my wife does this routinely every morning and they are stored standing on edge when we are not on board.
 

fergie_mac66

Active member
Joined
28 Jun 2009
Messages
5,552
Location
south yorks
The copious quantity of moisture exuded by the human body has to go some where, insulation just means it stays hidden in the mattress rather than condensing on the bed base. The best solution is developing the habit of raising the bed cushions for maximum ventilation as often as possible, my wife does this routinely every morning and they are stored standing on edge when we are not on board.
the stuff i used isnt insulation it allows a 3/4 free flow air gap but in addition I have found half a doz pot noodle pots under the mattress when we are not on board is a help
 

dtripp

New member
Joined
28 Jul 2006
Messages
18
Location
Western Australia
We're about to recover all our bunk mattresses, and the advice has been to use a waterproof acrylic fabric, same as for cockpit cushions, but maybe that's just for a S.Med climate? David
 

VicS

Well-known member
Joined
13 Jul 2002
Messages
46,040
"Vent air" may be another solution. Available from the likes of Hawke House or Toomer and Hayter.

Not cheap though!
 

pvb

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Joined
16 May 2001
Messages
43,985
Location
UK East Coast
My boat just has lots of approx 30mm holes drilled in the ply sheets under the bunks. Seems to work fine. But maybe I'm not as sweaty as you lot...
 

Pinnacle

Active member
Joined
6 Jan 2006
Messages
5,201
My boat just has lots of approx 30mm holes drilled in the ply sheets under the bunks. Seems to work fine. But maybe I'm not as sweaty as you lot...
I think this has to win the virtual prize for the easist and cheapest option. :D
 
Joined
23 Sep 2010
Messages
29,185
Location
West Sussex / Hants
When 'sailing for the masses' became popular in the 1950's it became clear what squalour our masters had put up with...supposedly waterproof vinyl covered mattresses soon became unpopular with internal condensation, so slatted bunk tops and little ( ineffectual but unseaworthy in case of flooding ) ventilators in bunk sides became the norm.

Slatted bunk supports soon became a bit of a snag if one needs to delve into a locker under the bunk so personally I use solid bunk tops with breathable mattress covers, but even now propping up the mattresses to air on sunny days seems worthwhile.

While on the subject of bunk mattresses, most crew even if rough tough racing types appreciate a good night's sleep on a 4" thick rather than wafer thin job - and all modern ones MUST be fire retardant - it can be an idea to have saloon mattresses sized & shaped to fit the cockpit too, but only in conditions one can be very sure they won't get wet...
 

theforeman

New member
Joined
6 Sep 2005
Messages
1,472
yes - we have it. i think it works pretty well. we have it curled up the sides of the mattress tho`and it seems to wick the condensation away.

we had " ventair " in the last boat. i found it just transferred the condensation from the bottom of the mattress to the bottom of the " ventair ".
you still really had to lift the mattress and dry off the bunk base but the
" ventair " was a lot easier to dry out than a mattress. not sure if " ventair " is still available. couldn`t find it when we changed boats hence change to drymat.
 
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