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Old 12-10-2016, 08:43 AM   #1
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Condensation on interior of bus

Hi all,

Can anyone comment on condensation. I'm in the middle of my conversion and I'm curious. i have a small bus... 6 window. I am not removing the ceiling sheet metal skin. I did remove the interior walls and re-insulated and put in bead-board walls. The floor will be minimally insulated with 1/2" polyfoam, 1/2" plywood and hardwood on top of that. But I am curious. When showering or cooking, is there ever much of a problem with condensation during cool or cold weather... condensation dripping or running down the ceiling or walls?

Thank you,

Ross
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Old 12-10-2016, 08:57 AM   #2
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I'll let others chip in on this but my personal experience was that the majority of condensation (as in " indoor rain") came from relying on propane heat. Maybe one of the scientists here can elaborate on the "why".
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Old 12-10-2016, 09:27 AM   #3
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Straight up, pure and simple. Condensation occurs when warm MOIST air comes into contact with a cold or cooler surface.

So,....just you being in the bus, breathing, will put moisture into the air, as well as some heat. Warm air can hold more moisture than cool air. When the warm moist air comes near or into contact with the cold surface of your bus ceiling, it will condense. When it does so, the moisture is pushed out of the air and returns to liquid form again.

There are tons of applicable videos on youtube explaining it, and many of them do so very well.
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Old 12-10-2016, 10:08 AM   #4
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Originally Posted by rossfree View Post
Hi all,

Can anyone comment on condensation. I'm in the middle of my conversion and I'm curious. i have a small bus... 6 window. I am not removing the ceiling sheet metal skin. I did remove the interior walls and re-insulated and put in bead-board walls. The floor will be minimally insulated with 1/2" polyfoam, 1/2" plywood and hardwood on top of that. But I am curious. When showering or cooking, is there ever much of a problem with condensation during cool or cold weather... condensation dripping or running down the ceiling or walls?

Thank you,

Ross
You should really consider using 3/4" of plywood for a couple of reasons.
1. It is a more stable base. consider what will happen if you screw anything to the floor. 1/2" is not thick enough to have many of the threads of the screws imbedded into the wood. (use sheet metal screws instead wood screws. The threads are bigger on sheet metal screws.)
2. 1/2" plywood is just too mushy plus the cost of superior 1/2, you might as well purchase 3/4".
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Old 12-10-2016, 11:09 AM   #5
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I would seriously consider reinsulating and replacing the ceiling. That's going to be one of the biggest heat sinks on the bus. So all the warm, moist air that you're generating, especially in winter- breathing, propane heat, showers, cooking, etc., will rise up, interact with the cooler air being generated by the thermal bridging from the metal ceiling, and create your indoor rain.
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Old 12-10-2016, 02:00 PM   #6
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I would seriously consider reinsulating and replacing the ceiling. That's going to be one of the biggest heat sinks on the bus. So all the warm, moist air that you're generating, especially in winter- breathing, propane heat, showers, cooking, etc., will rise up, interact with the cooler air being generated by the thermal bridging from the metal ceiling, and create your indoor rain.
Looking for the LIKE button. This will have to do.
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Old 12-10-2016, 02:03 PM   #7
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What effect would a dehumidifier have?
I don't have condensation problems, as I'm alternating electric heat (primary) and propane heat (secondary)

But, I've got a portable A/C (110v floor model) that's got a dehumidifier setting and it'd be super simple to plumb a slobber tube through the floor, as opposed to pulling the plug and draining the tank.
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Old 12-10-2016, 02:06 PM   #8
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Looking for the LIKE button. This will have to do.
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Old 12-10-2016, 02:11 PM   #9
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Old 12-10-2016, 06:16 PM   #10
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What effect would a dehumidifier have?
I don't have condensation problems, as I'm alternating electric heat (primary) and propane heat (secondary)

But, I've got a portable A/C (110v floor model) that's got a dehumidifier setting and it'd be super simple to plumb a slobber tube through the floor, as opposed to pulling the plug and draining the tank.
something to think about, i had 3 electric heaters going in my bus with half the bus blocked off in single digits. it was 37* in the bus in the mornings. nothing i did would overcome that steel ceiling and single pane windows, my dogs are still pissed.
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