Metal gets cold faster than other items so condensation begins on metal first.
Steel roof sweating.
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.
Metal roofs are known for this with condensation forming particularly at the beginning and end of a day.
When then environment outside becomes cooler i e.
The result is the roof sweating and dripping water all over your precious stuff.
Traditionally condensation is managed by insulating the metal roof so that the panel temperature never reaches the dew point.
That excess moisture ends up as drops of condensation on the roof.
The cold metal in contact with the warm air means that water droplets condensation forms on the inside surface of the shed roof.
Essentially condensation occurs at night when the temperature inside a building is warmer than outside.
Metal roof condensation especially with a tin roof can cause serious problems when the metal sweats or rainwater collects under the tin panels when this happens the tin roof can rust and even warp.
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.
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.
Picture a cloud of moisture floating overhead between the rafters.
Metal roof sweating is a result of excess humidity condensing on the underside of your roof.
The prime reason for this is due to the temperature differential between the inside and the outside of the shed.
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.
It doesn t matter if the air space is a half inch or six inches because the condensation factor will remain the same.
The condensation occurs most commonly on the roof as the warmest most moisture laden air rises to roof level.
Metal roof over shingles condensation.
Warm wet air rises and meets the cold roof and cools.
Metal roofs must be laid flat on a vapor barrier because steel will condensate if there s any air space underneath it.
If the tin roof sits on top of another material such as wood then you can get a case of wood rot.
