Metal Porch Roof Condensation

Condensation on metal roofs can be a problem once the weather starts to get cold.

Metal porch roof condensation.

Metal gets cold faster than other items so condensation begins on metal first. If the tin roof sits on top of another material such as wood then you can get a case of wood rot. It can lead to roof leaks even if rain has not occurred for several days. That excess moisture ends up as drops of condensation on the roof.

Essentially condensation occurs at night when the temperature inside a building is warmer than outside. Metal roof insulation increases the temperature of the inside surface of the ceiling. Worse if the roof is over your shop carport barn or self storage unit you have to worry about what damage it is doing to the contents of these buildings. Two common types of metal roof insulation are.

It is quite annoying to have the condensation falling on you like rain. Picture a cloud of moisture floating overhead between the rafters. Have you ever been under a metal roof that had condensation on the bottom side of it. At night the thin metal in the roof quickly cools down.

As it cools it can t hold as much moisture. When the temperature of the roof is lower than the air inside the extra moisture in the air condenses on the underneath of the roof. When this happens the tin roof can rust and even warp. The result is the roof sweating and dripping water all over your precious stuff.

Insulation you use needs to be closely bonded to the metal. When then environment outside becomes cooler i e. Condensation can cause your ceiling to rot. 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. By adding insulation to the internal surface of the metal then the dewpoint is less likely to be met. Metal roof condensation especially with a tin roof can cause serious problems when the metal sweats or rainwater collects under the tin panels. Warm wet air rises and meets the cold roof and cools.