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TOPIC: I Have An Existing Metal Roof and Have A Question

condensation

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I have an existing building which was used for horse training. The building is 60 by 120 feet 17 feet high. The roof is wood trusses 6/12 pitch with a 1 by 3 wood plank covered with metal sheating. The walls are wood post with 2 by 6 horizontally covered with steel sheating. There is no cement floor ,just sand. Every morning when the sun comes out water drips from the condensation on the roof. Ventilated soffit was installed and ridge vent at the top which is the only ventilation in the building everything else beeing closed. What can be done to eliminate that completely because I want to store dry stuff inside. thank you
Jacques Alary

11/22/2011
Jacques, Thanks for the question. Condensation occurs when warm moist air comes in contact with a cold surface. Increasing the amount of ventilation is probably the best way to control condensation in your building. To eliminate condensation, a floor may be required to reduce the source of moisture and insulation added to the roof and walls to seperate the warm moist air from the cold panel. Regards, David Stermer David Stermer
David Stermer

11/28/2011
+1 to David's comments. Ventilation should be used to control moisture/humidity that gets through the air barrier. The first thing you need to do is reduce the bulk transfer of moisture that is getting to the condensing surface (i.e. the underside of the roof). You are going to need to install some sort of vapor barrier across the roof line that will prevent that moisture laden air from getting to the cold roof. Insulation is going to be required in this cases as well so this is no small project. Eric Novotny
Eric Novotny
An informed customer is the Best Customer!

11/28/2011

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