Metal Porch Roof Condensation

When this happens the tin roof can rust and even warp.

Metal porch roof condensation.

Condensation happens when moisture filled air contacts anything that is below the dew point temperature. 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. At night the thin metal in the roof quickly cools down. Condensation on metal roofs can be a problem once the weather starts to get cold.

As it cools it can t hold as much moisture. When then environment outside becomes cooler i e. That excess moisture ends up as drops of condensation on the roof. The result is the roof sweating and dripping water all over your precious stuff.

Metal roof insulation increases the temperature of the inside surface of the ceiling. Traditionally condensation is managed by insulating the metal roof so that the panel temperature never reaches the dew point. It is quite annoying to have the condensation falling on you like rain. Two common types of metal roof insulation are.

Have you ever been under a metal roof that had condensation on the bottom side of it. It can lead to roof leaks even if rain has not occurred for several days. Essentially condensation occurs at night when the temperature inside a building is warmer than outside. Metal gets cold faster than other items so condensation begins on metal first.

Warm wet air rises and meets the cold roof and cools. If the tin roof sits on top of another material such as wood then you can get a case of wood rot. 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. The reason why condensation forms on the metal roof is that it s temperature is below the dewpoint of the internal air.

This in turn prevents moisture condensation on the metal roof. Insulation you use needs to be closely bonded to the metal. 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. By adding insulation to the internal surface of the metal then the dewpoint is less likely to be met.