Steel Roof Condensation Problems

Inadequate space allotted for thermal expanding and contracting of the panels.

Steel roof condensation problems.

Frequent stress from coil slitting cutting and rollforming panels. Changes to the structure s original form that puts tension on or moves the panels. The key to getting condensation to evaporate is air flow. When this happens the tin roof can rust and even warp.

Having ventilation holes around the roof at eaves level and in the gable walls allows moisture rich air to escape. Having vents in all elevations of the shed is an effective way of minimising metal roof sweating. This video shows what a significant condensation problem can look like. The lower the pitch of a metal shed roof and also the deeper the corrugations the worse the problem of metal roof sweating.

That excess moisture ends up as drops of condensation on the roof. In the case of the timber trusses and purlins they will rot and eventually lose their stability. Condensation happens when moisture filled air contacts anything that is below the dew point temperature. Picture a cloud of moisture floating overhead between the rafters.

Condensation on metal roofs can be a problem once the weather starts to get cold. Metal roof condensation especially with a tin roof can cause serious problems when the metal sweats or rainwater collects under the tin panels. Improper usage handling and storage by installers. Warm wet air rises and meets the cold roof and cools.

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. As it cools it can t hold as much moisture. It is the leading cause of the deterioration of trusses.

This applies to both the timber and steel trusses.