Steel Roof Condensation Problems

Warm wet air rises and meets the cold roof and cools.

Steel roof condensation problems.

That excess moisture ends up as drops of condensation on the roof. Frequent stress from coil slitting cutting and rollforming panels. Metal gets cold faster than other items so condensation begins on metal first. Although condensation in roofs may not seem like a serious problem it actually is.

Essentially condensation occurs at night when the temperature inside a building is warmer than outside. In the case of the timber trusses and purlins they will rot and eventually lose their stability. The lower the pitch of a metal shed roof and also the deeper the corrugations the worse the problem of metal roof sweating. Having vents in all elevations of the shed is an effective way of minimising metal roof sweating.

When this happens the tin roof can rust and even warp. Inadequate space allotted for thermal expanding and contracting of the panels. It can lead to roof leaks even if rain has not occurred for several days. As it cools it can t hold as much moisture.

Improper usage handling and storage by installers. This video shows what a significant condensation problem can look like. Metal roof condensation especially with a tin roof can cause serious problems when the metal sweats or rainwater collects under the tin panels. Condensation on metal roofs can be a problem once the weather starts to get cold.

Changes to the structure s original form that puts tension on or moves the panels. It is the leading cause of the deterioration of trusses. This applies to both the timber and steel trusses. Having ventilation holes around the roof at eaves level and in the gable walls allows moisture rich air to escape.

Picture a cloud of moisture floating overhead between the rafters.