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  1. #1
    Member
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    Jul 2006
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    Florida
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    Mahindra 4005

    Default Shipping container condensation

    I have two shipping containers at my property that I use for tool and tractor storage. They are located in south Mississippi where the summers are hot and humid. At times it seems to virtually rain inside the container from condensation.
    Both are coated with Kool Seal roof coating. Any ideas on ventilation or coatings (inside or outside) that could help with the condensation.

    Thanks
    DN

  2. #2
    Super Member JB4310's Avatar
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    Feb 2005
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    Central CT
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    J.D. 4310 E-hydro

    Default Re: Shipping container condensation

    I've got a twenty footer, occasionally get moderate condensation.

    Not much I can recommend except keep it sealed up tight. Not practical I know, but I think it's warm moist air that condenses on the cool steel. So either more ventilation or no ventilation.

    I guess you could spray on insulation, but that might get costly.

    JB
    JD 4310; E hydro, 300CX, 48 BH, 60" box, 72" rake, 72" rear blade, cast pallet forks, 48", 61"HD & 73" high volume bucket.
    FORD 1700; 2 WD, 2600 hrs.
    JD 320; Hydra lift, 48" deck and 48" snow blade.
    2007 Dodge Ram 3500, Cummins 6.7L, Aisin 6 speed, 9ft utility body.

  3. #3
    Elite Member timswi's Avatar
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    Beaver County Pa
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    Kubota BX23 & RTV1100

    Default Re: Shipping container condensation

    Could try covering the inside with 3/4" foamboard....temp equalization is the problem. Have the same issue with steel decking in the storage area in my house. Have to run silicone heaters and a dehumidifier in there to keep it dry.
    BX23TLB & RTV1100 with 72" Power Angle Plow

  4. #4
    Elite Member MotorSeven's Avatar
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    Aug 2005
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    NE TENN (Hancock Co)
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    Kioti DK40SE Hydro

    Default Re: Shipping container condensation

    I would put in a solar roof vent & that would take care of the problem. I put a small marine one in a 6x10 utility trailer & it worked fine, but for a shipping container you will have to go bigger.

    RD
    2008 KIOTI DK40Se Hydro
    1978 Sling Blade/wood handle

  5. #5
    Elite Member
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    North of Mtl,Que,Can (Ste Adele)
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    MT180D

    Default Re: Shipping container condensation

    Install a metal roof vent, the square type with louvers on all 4 sides, well sealed where it contacts the roof decking..
    One should do the trick but you also need to provide an inlet for the air to get in as the vent cannot suck from a vacuum, that would be best installed near the floor so that the vent can totally change the air out.
    For a inlet vent I'd suggest the type with louvers as seen on the sides of house trailers and RV's. Again one should be sufficient and place it diagonally opposite of the roof vent location to get maximum cross flow. ( EG top rt front on roof and bottom left rear for inlet)

    If you ever stood on the roof of a house near a vent you would sure feel the heat coming out of an attic, (heat and humid vapors go hand in hand)

    Note that the turbine types have been proven much less efficient (and more troublesome) than the cupola types. They, by design, require a bearing to rotate which corrodes and freezes in cold situations.
    RV type vents only work in one direction which is OK on an RV as you are pulling creating the wind (suction) but useless when static, in fact if the wind is the wrong way you would simply be pressurising the container and pressure would cause more condensation.

  6. #6
    Member
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    Florida
    Tractor
    Mahindra 4005

    Default Re: Shipping container condensation

    Could try covering the inside with 3/4" foamboard....temp equalization is the problem. Have the same issue with steel decking in the storage area in my house. Have to run silicone heaters and a dehumidifier in there to keep it dry.
    __________________
    Timswi
    I thought of using foam board but was afraid of moisture behind the board causing the glue to release or letting mold form behind the board.

    Install a metal roof vent, the square type with louvers on all 4 sides, well sealed where it contacts the roof decking..
    One should do the trick but you also need to provide an inlet for the air to get in as the vent cannot suck from a vacuum, that would be best installed near the floor so that the vent can totally change the air out.
    For a inlet vent I'd suggest the type with louvers as seen on the sides of house trailers and RV's. Again one should be sufficient and place it diagonally opposite of the roof vent location to get maximum cross flow. ( EG top rt front on roof and bottom left rear for inlet)

    If you ever stood on the roof of a house near a vent you would sure feel the heat coming out of an attic, (heat and humid vapors go hand in hand)

    Note that the turbine types have been proven much less efficient (and more troublesome) than the cupola types. They, by design, require a bearing to rotate which corrodes and freezes in cold situations.
    RV type vents only work in one direction which is OK on an RV as you are pulling creating the wind (suction) but useless when static, in fact if the wind is the wrong way you would simply be pressurising the container and pressure would cause more condensation.

    Piloon
    I've been hesitant to place a roof vent because the roof is corrugated (ridges and valleys ) like the sides and I'm afraid I won't get a good seal and water will leak around the vent.

    Thanks for the suggestions. Any others? It was almost like it was raining inside the container today.

    DN

  7. #7
    Gold Member
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    Yanmar YM240D / Massey Ferguson 135 / New Holland TN75F / Pasquali 988 and 997 / Goldoni 20A and 226 / Ferrari 76 and 85 / Holder A50 / Valpadana VMC 180 / Long 610 4WD

    Default Re: Shipping container condensation

    I experienced the same problem and mounted a couple of passive air fans on the roof. These are the type that move by wind or heat rising. Although they didn't eliminate the problem, it helped quite a bit.

  8. #8
    Elite Member
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    nicholson, pa
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    John Deer Lt160

    Default Re: Shipping container condensation

    Just an idea, for green houses there are many solar powered vents that raise and lower when they hit a certain temp.

  9. #9
    Super Member Gary Fowler's Avatar
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    Bismarck Arkansas
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    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: Shipping container condensation

    We use a lot of shipping containers for storage and even field offices. We cut in 6" tall x 12" long vents in the sides rightnext to the top about every 10 feet. You can use the cut out to make a shed over the hole then weld on 2 side pieces to make it rain tight and cover the hole with screen to keep out the insects. Then cut in some floor ventilation holes the same way. Natural convection will pull in cool air from bottom and exit at top. We never have condensation problems.

  10. #10
    Silver Member Frankdozer's Avatar
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    Mar 2009
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    Bridgton, Maine
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    1984 John Deere 455D

    Default Re: Shipping container condensation

    I have a 20' container at my vacation home in Maine. I use it to store my snowmobiles. Even in the winter, this time of year, the ceiling is covered with condensation. Feels as tho it's raining inside. This happens all year. I was thinking of a small electric heater. Just enough heat to eliminate the condensation. It's caused by a colder outside than inside temperature. The only other way is to install high exhaust vents and low intake vents. Just like ventilating your attic.

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