moisture from corrugated roofing

Discussion in 'Roofing and Siding' started by ckev70, Mar 11, 2019.

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  1. Mar 11, 2019 #1

    ckev70

    ckev70

    ckev70

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    20190311_074716.jpg 20190311_074816.jpg 20190311_074742.jpg 20190311_074730.jpg Description of room:
    Enclosed sunroom that is 20'x24'.
    8 single pane windows. 1 patio door leading outdoors. 2 metal doors 32". 1 interior patio door between mainhouse and sunroom.

    main house is on raise foundation so there is a 2 steps down to the sunroom.
    Built onto of concrete aggregate slabs @ ground level.
    This room is finished with sheetrock and some insulation on the ceiling. roof spacing is probably 4"
    Roofing is corrugated.

    Problem started last year when water started leaking in 2 areas. I resealed the seams with Wet patch roofing material where i believed the seams were dried and cracked.

    This season, ceiling is wet again. I removed some sheetrock and some wet fiberglass insulation. I also noticed that there seems to be tar paper missing since it exist in the upper ceiling bay area.

    Overnight, the roofing seems to show condensation.

    Inside mainhouse temp: 64
    Enclosed sunroom temp: 47

    What are things i should do to fix this problem?
     
    Last edited by a moderator: Mar 11, 2019
  2. Mar 11, 2019 #2

    nealtw

    nealtw

    nealtw

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    Removing the tarpaper was someone's attempt to find a leak . The condensation is a result of warmer air with moisture contacting the cold roof.
    You need air flow above the insulation 1 1/2" with air coming in the bottom of the roof and out the top. And then much more insulation so you keep the drywall warm. Then you also have to have a ceiling sealed so no air from inside gets to the roof or you will have condensation like you have now.
     
  3. Mar 11, 2019 #3

    ckev70

    ckev70

    ckev70

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    Since the ceiling joist is the roofing joist (it's a flat roof) and is 4". the corrugated roofing material sits is right above this, i can't get the 1 1/2" spacing above and below insulation. Would I be able to sister in a 2x6 to increase the depth of the roof so insulation can be added with the proper air space?

    corrugated roofing
    tar paper (if it hasn't been removed during prior repairs
    insulation (foil down) - touches bottom of roofing as well as top of ceiling drywall (4" depth)
    dry wall (probably 1/2")
     
  4. Mar 11, 2019 #4

    nealtw

    nealtw

    nealtw

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    When it is open like this can air come in from outside near the roofing?
     

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