Condensation On Metal Garage Roof

Why metal shed and garage roofs get condensation.

Condensation on metal garage roof. Traditionally condensation is managed by insulating the metal roof so that the panel temperature never reaches the dew point. This is often accomplished using vinyl backed fiberglass insulation to prevent humid air from coming into contact with the cooler metal roof which may be at or below the dew point. As it cools it can t hold as much moisture. Condensation happens when moisture filled air contacts anything that is below the dew point temperature.

Warm wet air rises and meets the cold roof and cools. Warm air has much greater capacity to. The prime reason for this is due to the temperature differential between the inside and the outside of the shed. Metal gets cold faster than other items so condensation begins on metal first.

Metal roofs are known for this with condensation forming particularly at the beginning and end of a day. This acts like a giant radiator so the air inside the shed gets very warm. How to stop metal roof sweating condensation dripping very easily cheaply and completely as a do it yourself diy project. It took me a while to work this out but if you think of the way a solar still works that is what is happening to your shed roof.

Picture a cloud of moisture floating overhead between the rafters. The condensation occurs most commonly on the roof as the warmest most moisture laden air rises to roof level. Condensation on metal roofs can be a problem once the weather starts to get cold. Metal roof sweating is a result of excess humidity condensing on the underside of your roof.

The cold metal in contact with the warm air means that water droplets condensation forms on the inside surface of the shed roof. It can lead to roof leaks even if rain has not occurred for several days. I have metal corrugated sheets on my garage roof which i have covered completeley on the inside by sticking with clear silicone sealant as this allows for movement 50mm thick pollystyrene insulation sheets problem is cured no condensation and the garage is much warmer. That excess moisture ends up as drops of condensation on the roof.