Condensation

The friendliest place on the web for anyone with an RV or an interest in RVing!
If you have answers, please help by responding to the unanswered posts.

fyrmnk

Active member
Joined
Aug 14, 2006
Posts
35
Hi all. My dad has a bus conversion. He boxed in an access area over the driver' seat for maintenance access. It is insulated, but he has been finding condensation on the exterior wall/ceiling in this access area.

What other options are there to fight this. Would expanding foam applied driectly to the surface or some other spray on insulation work to keep the moisture laden air from the living area from condensing on this surface? Thanks in advance.
 

Bob Buchanan

Well-known member
Joined
Mar 3, 2005
Posts
3,038
Location
Philadelphia, PA
fyrmnk said:
Hi all. My dad has a bus conversion. He boxed in an access area over the driver' seat for maintenance access. It is insulated, but he has been finding condensation on the exterior wall/ceiling in this access area.

What other options are there to fight this. Would expanding foam applied driectly to the surface or some other spray on insulation work to keep the moisture laden air from the living area from condensing on this surface? Thanks in advance.

There was another thread recently on condensation -- but can't recall the topic. The principle involved here is that warm air holds moisture, and cold are releases moisture. For example, in the other thread someone was having problems with moisture on and over the front window of a class A in the AM's. The problem with windows is that if the blinds are drawn at night, the space between the window and the blind becomes cold and releases moisture. If the blinds are left open, the condensation will be less because that air space will cool only as the room cools.

Not sure of what you describe, but if you keep that box open on cold nights, the air will not become isolated from the room air that has a higher temperature. You could also keep a space heater in that area to keep it warmer. You could also install a small DC fan to keep the air moving. The insulation you describe will help to keep the cold air out, but once the box is closed -- it will become cold in there.

The other suggestion is to keep the moisture down in the rig air. This can be done by being sure to turn on the stove hood fan when boiling water or other cooking that puts moisture in the air. Also, the fan in the bathroom should alway be on during a shower. Whatever is placing moisture in the inside rig air space -- try to keep it to a minimum.

Hope this helps . . .
 
Top Bottom