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Condensation in cargo trailers

telephoneguy | Posted in General Discussion on January 16, 2007 03:48am

This question is for those of you using cargo trailers.Here in the Pacific Northwest I have condensation on the inside roof of my 4×8 enclosed trailer most of the year.I’m about to use it for storing and transporting my tools to jobsites on a full time basis and I’m worried about the moisture problems.I’m wondering if I should simply use a low wattage buld ,electric  dehumidifier,or a drizair type unit.Do I need to have some type of vent in the trailer as well?I’ll have power most of the time. I thought I’d install a GFI 4 outlet electrical box inside the trailer to plug tools into on the job and when at home overnight and an RV type plug outside to plug the power cord into it

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Replies

  1. User avater
    McDesign | Jan 16, 2007 04:45am | #1

    How about just a lightbulb or two, and some venting below and up top?

    Forrest

  2. Mooney | Jan 16, 2007 04:48am | #2

    Insulate it   and youre good to go.

    Tim

     

  3. DanH | Jan 16, 2007 05:15am | #3

    You just need to raise the temperature of the inside maybe 5 degrees. Lightbulbs would probably do it. And anywhere except where you are there would be enough sun that painting the roof black or stretching a dark-colored tarp over it would suffice.

    Half of the harm that is done in this world is due to people who want to feel important. They don't mean to do harm but the harm does not interest them. --T.S. Eliot
  4. MAsprayfoam | Jan 16, 2007 07:02am | #4

    Mooney is right on. Insulate it and the problem is gone.

    A spray foam (closed cell only here) insulation guy should do that for you for relatively cheap according to his schedule.

    Stu

  5. dangerboybb | Feb 13, 2024 06:10pm | #5

    Glad I stopped by here, I'm also in the Pacific NW, and have the same problem. Due to the lack of sunshine here, there's no way for the cargo trailer to get warmed up by the sun itself. I noticed there's a thin layer of wood sheeting that they tack on the top to help minimize the condensation problem, however, it's fairly bad, especially causing major humidity problems on the inside of my trailer to the point that any cardboard boxes I have in there are practically mushy to the touch due to the humidity. I'm wanting to cut away all of the thin wood sheeting they lined the interior top with and spray on some foam insulation I just purchased for this specific task, as the thin sheeting is CONSTANTLY in a state of being soaked, and there are CONSTANTLY crazy droplets of water from the condensation forming on the roof. It's even occurring on the 1' square window vent on the top, off of the plastic covering that covers it! It's a condensation madhouse in my trailer! During the winter here, it rains almost nonstop, it's nuts. The winters aren't too bad, but they definitely take their toll on the inside of my trailer on anything inside of it with the humidity and condensation. I'm dreading looking at electronics that I've stored in there for years now. :-\

    I'm surprised that they don't use this spray on insulation, or at least some kind, to line the interior ceiling at least with this stuff. What good is a trailer if it's going to ruin all your stuff you have stored in it? Oh well, it is what it is, and I'll be trying the spray on insulation. Not sure when I'll be able to do it, it has to warm up a bit before I can spray it on, too cold still yet. Any other suggestions before I do it are appreciated!

    I'm planning on cutting away the thin wood sheeting up top, because it's only serving as a sponge up there, and will probably spray a little foam on the interior side of the lid that covers the air vent up top as well. Wish me luck, I'll try to post back about my experience in the task as well as the results after. The part that sucks is I'll be moving during winter in about a month, so not sure I'm going to get a chance to spray it before I pack the trailer up for the move. Ugh! :-\ Hoping I can get it done before needing to pack!

    Pics
    I'm including some pictures of the inside ceiling of the trailer. You'll notice there's a patch nearest camera that shows the crazy amount of water droplets forming on the ceiling. That used to be covered with the same thin wood sheets, but due to leakage problems surrounding the vent up top, the end of it lost it's binding and it all fell loose, leaving it a hanging mess, so I got a box cutter, and just cut off the wood at one metal junction seen there. I'm thinking I'm going to do the same to the rest, they're just accumulating water, and never getting dry!! Cardboard boxes stored for ANY length in there, and they start turning mushy, and any glue holding the layers together unbind to where you've got all the layers of the box loose, and destabilizes the cardboard to the point it's useless. So can't store anything in there unless I get the humidity problem under control!! Of course being in the Pacific NW doesn't help with that! Hoping the spray on insulation is a solution. *fingers crossed*

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