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Condensation in garage vapor barrier (south facing wall)

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  • #16

    Re: Condensation in garage vapor barrier (south facing wall)

    Originally posted by Dropsix View Post

    Insulation was up one day maybe before the VB went on. It hasn’t been cold during the day. Maybe goes down to 1-5 C at night and then highs of 15-20 C last week.

    wasn’t using anything to heat the space because the heater isn’t installed yet. That’s why the garage stayed cold all day while the hot afternoon sun was beating on the one wall.
    It is exactly as I was telling, the inside of the garage being cold (colder) than the wall with the sun warming it up, so the cold vapour barrier would have the moisture from the insulation condense on the vapour barrier.

    There does not need to be a lot of water in the insulation to have this happen, just as windows in a house can get condensation on them, or your cool drink bottle or can getting condensation on them.

    If your insulation is dry there should not be a problem with this.
    nnieman likes this.

    Have fun and take care
    Leo Van Der Loo

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    • #17

      Re: Condensation in garage vapor barrier (south facing wall)

      Originally posted by Leo Van Der Loo View Post

      It is exactly as I was telling, the inside of the garage being cold (colder) than the wall with the sun warming it up, so the cold vapour barrier would have the moisture from the insulation condense on the vapour barrier.

      There does not need to be a lot of water in the insulation to have this happen, just as windows in a house can get condensation on them, or your cool drink bottle or can getting condensation on them.

      If your insulation is dry there should not be a problem with this.
      Alright fair. To be honest, while they seem dry the batts where kept under a roof but outside. Who knows how long they were there for but they were pretty dusty. this was at home hardware

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      • #18

        Re: Condensation in garage vapor barrier (south facing wall)

        Originally posted by Leo Van Der Loo View Post

        It is exactly as I was telling, the inside of the garage being cold (colder) than the wall with the sun warming it up, so the cold vapour barrier would have the moisture from the insulation condense on the vapour barrier.

        There does not need to be a lot of water in the insulation to have this happen, just as windows in a house can get condensation on them, or your cool drink bottle or can getting condensation on them.

        If your insulation is dry there should not be a problem with this.
        I agree with Leo. And, come winter, when the humidity is lower and the outside temps are colder than inside temps, this shouldn't happen.

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        • #19

          Re: Condensation in garage vapor barrier (south facing wall)

          Originally posted by John Bartley View Post

          I agree with Leo. And, come winter, when the humidity is lower and the outside temps are colder than inside temps, this shouldn't happen.
          I also agree

          It sounds like this is not an ongoing problem

          Nathan

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          • #20

            Re: Condensation in garage vapor barrier (south facing wall)

            Originally posted by John Bartley View Post

            I agree with Leo. And, come winter, when the humidity is lower and the outside temps are colder than inside temps, this shouldn't happen.
            I also agree

            It sounds like this is not an ongoing problem

            Nathan

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            • #21

              Re: Condensation in garage vapor barrier (south facing wall)

              Alright thanks guys!

              I am putting up the smart vapor barrier (certainteed membraine) tomorrow and will see how it does. Drywall will go up shortly after and then heater!

              Thanks again!

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              • #22

                Re: Condensation in garage vapor barrier (south facing wall)

                Why wait for the heater? Maybe turn it on now and help the drying process?

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                • #23

                  Re: Condensation in garage vapor barrier (south facing wall)

                  A heater will only create more condensation. Once the VB and drywall goes up it won't happen to the most extent. If you took the drywall off of most walls --I'm sure there would be condensation in the wall if it is cold on the outside. That's what VB is for.

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                  • #24

                    Re: Condensation in garage vapor barrier (south facing wall)

                    Originally posted by Wally in Calgary View Post
                    A heater will only create more condensation. Once the VB and drywall goes up it won't happen to the most extent. If you took the drywall off of most walls --I'm sure there would be condensation in the wall if it is cold on the outside. That's what VB is for.
                    Wally, how will the heater cause more condensation? Unless I missed it, the op hasn't specified what type of heater, are you assuming a fuel fired heater which produces water vapor as the products of combustion? What about an electric heater?

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                    • #25

                      Re: Condensation in garage vapor barrier (south facing wall)

                      Originally posted by Doug G View Post

                      Wally, how will the heater cause more condensation? Unless I missed it, the op hasn't specified what type of heater, are you assuming a fuel fired heater which produces water vapor as the products of combustion? What about an electric heater?
                      It’s a 50k btu propane heater. And the reason being is I need the drywall in place before the heater goes up because it will be much tougher to put up sheets once the gas line is run and the heater is physically in the way.

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                      • #26

                        Re: Condensation in garage vapor barrier (south facing wall)

                        Originally posted by Wally in Calgary View Post
                        A heater will only create more condensation.
                        Only if it's an unvented propane, NG, or kerosene heater.

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                        • #27

                          Re: Condensation in garage vapor barrier (south facing wall)

                          Originally posted by drzaius View Post

                          Only if it's an unvented propane, NG, or kerosene heater.
                          If you heat a room that is cold on the outside you will cause vapor in between. The drywall will slow it down -- but there will be moisture present.

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                          • #28

                            Re: Condensation in garage vapor barrier (south facing wall)

                            Originally posted by Wally in Calgary View Post

                            If you heat a room that is cold on the outside you will cause vapor in between. The drywall will slow it down -- but there will be moisture present.
                            No, heating a room will not create moisture. If a room is warmer than the outside, and there is a source of moisture in the room, then the humidity in the room will rise and that vapor will condense on cold surfaces, like an uninsulated exterior wall. But if there is no source of water in the room, and you heat the room, that will not cause condensation to form on the outside wall.

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