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Window Condensation

8285 Views 27 Replies 6 Participants Last post by  cargovanconversion
I'm preparing to work on the walls of the van, and I have to prevent, that condensation from my 'All-Around Windows' has the opportunity to get into my insulation.

I noticed that at some points, water can seep into the walls underneath where there are no weeping holes.



General question: How is your experience with condensation on the windows?

Specific question: What have you done to keep that wall space underneath the windows dry?

I thought of gluing insulation board against the skin of the vehicle, but now wonder if I shouldn't use an airspace first.

Van Williams
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Roger that. I was imagining a rubber strip attached to the sill plate that would sit against the glass directly, rather than the metal window frame/van body. I haven't decided what I'm doing on mine yet either, I have full wrap windows like you do, so I'll be putting some thought in on this and checking out everyone's solutions for sure.
Roger that. I was imagining a rubber strip attached to the sill plate that would sit against the glass directly, rather than the metal window frame/van body. I haven't decided what I'm doing on mine yet either, I have full wrap windows like you do, so I'll be putting some thought in on this and checking out everyone's solutions for sure.
We're on the same track.

I wanted to work with a wood frame. If that would be placed directly against the glass (with a seal), you will have to deal with the condensation on the wood. That's a big No No for me too.
I'd rather create a few weep holes or give it the opportunity to dry out.

Van Williams
Maybe the solution is to deal with the problem and not the end result. Either air circulation or the use of a dehumidifier could reduce the moisture content of the interior air. Another approach would be to keep the interior air at a high enough temperature to be above the dew point. Or some combination of these.


I am hoping the small dehumidifier will reduce the moisture content enough that I do not have to heat the whole van or replace the warm interior air with colder outside lower humidity air. Will do some experiments next winter to determine what will work and what will not.
Maybe the solution is to deal with the problem and not the end result. Either air circulation or the use of a dehumidifier could reduce the moisture content of the interior air. Another approach would be to keep the interior air at a high enough temperature to be above the dew point. Or some combination of these.
I don't think it's either or; you have to reduce possible standing water and avoid wet insulation. And, as you said, improve ventilation and avoid condensation.

FYI, I just finished my version of the floor vent, with a unique twist, I think. Hope to publish it the next couple of days. Lots of photos and videos. That and a roof vent may help, but you know all about that.

Van Williams
I was just thinking about the discussion here of a de humidifier. All it does is pass moist air over a cool surface and collects the water. Don't we already have half of that function with the Windows?

If so, the problem might just be how to collect the water from the Windows.

We actually sort of did this in our last trailer, an R-Pod. The water from the Windows would pool in the lower window frame channels, so on chill nights we would put a towel there to wick the water.

Maybe a crude method, but also maybe worth considering if the issue of moisture is a rare problem (as in arizona).
avoid placing any insulation against the skin of the vehicle, but use an airspace first, followed by poly-iso and a flexible insulation such as thinsulate or denim.
From what I have read it is not recommended to use demim insulation. It is hygoscopic so it will hold the moisture.
I was just thinking about the discussion here of a de humidifier. All it does is pass moist air over a cool surface and collects the water. Don't we already have half of that function with the Windows?

If so, the problem might just be how to collect the water from the Windows.

We actually sort of did this in our last trailer, an R-Pod. The water from the Windows would pool in the lower window frame channels, so on chill nights we would put a towel there to wick the water.

Maybe a crude method, but also maybe worth considering if the issue of moisture is a rare problem (as in arizona).
It's sort of what GROOVY2 described earlier, however these Transit windows have no channels.

I'm inclined 'to go with the flow' and let the condensation go where it wants to go and make some weep holes or facilitate it the be able to dry out, without getting close to the insulation. And, of course, prevent it as much as possible with ventilation.

Van Williams
From what I have read it is not recommended to use demim insulation. It is hygoscopic so it will hold the moisture.
It's been said before, but 'UltraTouch Denim Insulation' is treated for that. As with many materials, it has its pros and cons. Never any easy decision. Thinsulate may be better in that regard, but not a fantastic R-value.

Van Williams
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