Condensation On Metal Garage Roof

Metal roof sweating is a result of excess humidity condensing on the underside of your roof.

Condensation on metal garage roof.

The condensation occurs most commonly on the roof as the warmest most moisture laden air rises to roof level. Why metal shed and garage roofs get condensation. Metal roofs are known for this with condensation forming particularly at the beginning and end of a day. Metal gets cold faster than other items so condensation begins on metal first.

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. As it cools it can t hold as much moisture. Warm air has much greater capacity to. Traditionally condensation is managed by insulating the metal roof so that the panel temperature never reaches the dew point.

Essentially condensation occurs at night when the temperature inside a building is warmer than outside. Picture a cloud of moisture floating overhead between the rafters. It can lead to roof leaks even if rain has not occurred for several days. Ok now we understand a bit how the condensation in metal sheds happens.

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. 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. Condensation happens when moisture filled air contacts anything that is below the dew point temperature. The cold metal in contact with the warm air means that water droplets condensation forms on the inside surface of the shed roof.

Warm wet air rises and meets the cold roof and cools. That excess moisture ends up as drops of condensation on the roof. Condensation on metal roofs can be a problem once the weather starts to get cold. The prime reason for this is due to the temperature differential between the inside and the outside of the shed.