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Roof Cover = Condensation?


Chris 15151
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This year we cleaned our coachman VIP 545/4 2012 caravan in November and put a roof cover on to try to keep it clean. We have checked it periodically. We were horrified when we went to check it today (it's in storage) to find mould/mildew on the fans in the roof and the bathroom sink. Could it be because the fans are covered? Even though the cover is supposed to be breathable?? Have taken cover off now and returning tomorrow to clean off the mould. Has anyone else found this?? Is it best not to cover?? Help!!!!

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I have used covers on my last two vans and not had any problems, I would however suggest that this year has been extremely wet not giving any time for moisture in the air to dry out. So don't panic it could be that simple so keep on using your cover!!

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Hi Chris/ Cristine,

Welcome to the forum.

I use an all over cover a, “Protec breathable cover”. I leave the roof vents, (Four of them) open on the first setting/catch. I ensure all the floor vents are not obstructed and my seat cushions and bedding mattresses are left standing on their edges inside the caravan, so as not to impede the flow of air.

Logic dictates that the cover being darker than the caravan absorbs the minuscule amount of heat that is available during the winter from the weak winter sunshine. This sets up a convection air current from the floor of the caravan to the roof, because the inside of the caravan must be warmer than the outside of the caravan.

Movement and venting of air prevents mould growth. I regularly inspect the interior of my caravan for what I consider moisture in the air. If I feel there is any condensation or damp in the air inside the caravan, (I do this mainly by feel and touch, i. e. running my hand over hard cold surfaces). If I think it’s getting damp I place my dehumidifier at one end of the caravan for one 24 hour period and then the other end for another 24 hours. After which the caravan is bone dry.

I typically run my dehumidifier for 48 hours on average every two months, but this winter it has been about once a month. I have used this technique on my caravan since I got into caravanning. Before this I used the same technique to keep my boats dry and mould free. It works. .! In 30 years I have never experienced any form of mould. Keep in mind marinas are a much harsher damp environment than caravan storage.

In conclusion your breathable cover is not the cause of the problem. However it could be the exceptionally wet winter that we have just experienced, could have required a little more attention to detail from yourself. If you observe the above precautions and assuming your caravan has no leaks, you will not experience any damp or mould inside your caravan. ;)

Edited by WindlePoones
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It is due to the wet weather not allowing the cover to dry out. Had the same thing happen but caught it before the mildew started. My solution was to remove the cover completely. Haven't had anymore trouble and van is as dry as a bone. In fact we are in it at the moment. Lovely and warm and dry!

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This year we cleaned our coachman VIP 545/4 2012 caravan in November and put a roof cover on to try to keep it clean. We have checked it periodically. We were horrified when we went to check it today (it's in storage) to find mould/mildew on the fans in the roof and the bathroom sink. Could it be because the fans are covered? Even though the cover is supposed to be breathable?? Have taken cover off now and returning tomorrow to clean off the mould. Has anyone else found this?? Is it best not to cover?? Help!!!!

Had exactly this a couple of years ago and its down to lack of airflow in or around the van, so therefore it sweats.

You need to get rid of the mould and pores rapidly.

Remove all the furnishings to dry them fully (incl the carpets). Then you need to us this

http://www. caravanaccessories4u. co. uk/products/awnings/awning-accessories/sophis-digestant-500ml

And it needs to be used on every surface.

Then you will be fine

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Thank you folks for your swift replies. Will do all that you say!!! Thank you!!! Hope you all have a great caravanning season!!!! Nearly there now:-) x

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  • 3 weeks later...

I was interested in a van cover. ..contacted sprite for sizes, and they politely advised that it was not something they would recommend for exactly the reason you have. ..guess it was good advise after all, ps I never did buy one

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I had mildew in the bathroom when I got the van out of storage a couple of weeks ago, and I had it covered with a Protec cover. Very wet winter and not much chance of the water on the roof of the van evaporating.

SWMBO did a fantastic job cleaning it all up, using weak sodium bicarbonate solution.

I hope to get somewhere under cover for next winter.

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Plenty of sound advice from posters on venting the inside of the van. In addition we put a number of bowls of salt around the van and used around kilo. Re water on the roor, that happened to us last winter. The weeight of the snow prevented air circulation and the cover / roof drying off. This winter took tips from the message board and put two semi deflated plastic footballs under the cover to give air circulation and tilted the van forward for drainage. Just took the cover(Specialised Covers) off yesterday and the roof was dry and the van as clean as when we covered it in October. So thanks to last years tipsters.

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