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problem with condensation inside shed roof!!

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  • 23-11-2009 12:40am
    #1
    phxfrmtheflms
    Registered Users Posts: 3 ✭


    I have put a clear corrugated roof on a newly built wooden shed/workshop and i am having problems with condensation. The drops of water are holding on the inside of the roof and are not dropping as yet but i fear they will start dropping come early spring as temps will change more rapidly with sunrise.
    I am contemplating putting a second layer of (4no 6ftx2.5ft) the same sheets straight onto the existing roof. With the existing roof screw cappings acting as spacers for this 2nd skin, in the hope that this will create a temp change barrier, therefore cutting out the condensation. will this work??
    Also the shed/workshop is well vented, i dont want it to be too cold in there.....:) Thx


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    #2
    slimjimmc
    Registered Users Posts: 7,786 ✭✭✭slimjimmc


    Sounds like you'll create a perfect greenhouse for mould and mildew.


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    #3
    phxfrmtheflms
    Registered Users Posts: 3 ✭phxfrmtheflms


    have you any suggestions?


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    #4
    gillad
    Closed Accounts Posts: 368 ✭✭gillad


    you should have put a layer of felt under the sheets.if you can attach felt to the under side of the sheets which will be awkward to do,this will stop condensation .....gripfill or mastic may stick the felt to the sheets


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    #5
    cnocbui
    Registered Users Posts: 20,091 ✭✭✭✭cnocbui


    Flat, as opposed to corrugated, twin or multiwall clear polycarbonate sheeting in place of the corrugated stuff.

    I take it when you say clear you mean transparent so it lets in light?


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    #6
    karltimber
    Moderators, Home & Garden Moderators Posts: 1,921 Mod ✭✭✭✭karltimber


    Hi,

    had the same prob with my shed. the cold air outside is hitting the slightly warmer air inside and condensing on the roof.
    I put up 1" insulation and then ply -but a lot of work.
    What I eventually did was, to lift the roof (you said it was clear) and run a full sheet of plastic under the roof -down to the front/gutters.
    you might be able to get a clear -heavy gauge plastic -to let the light through.

    k


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    #7
    Murdec
    Closed Accounts Posts: 40 ✭Murdec


    Air flow would mostly elimenate teh condensation but leaving windows open is a bit daft really. Did you consider spraying on the insulation to the roof?


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    #8
    -Trek-
    Closed Accounts Posts: 9,139 ✭✭✭-Trek-


    Maybe you could replace with these

    http://www.tegralmetalforming.com/index.php?page=condri-2


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    #9
    jetfiremuck
    Registered Users Posts: 3,467 ✭✭✭jetfiremuck


    I used large bubble wrap rolls rolled over the joists before putting the roof material on. Worked out fine.


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