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Abstract

This paper investigates the effect of roofing systems on the humidityinduced corrosion of zinc sheeting in highly insulated zinc roofs. Ten types of roofing systems (U< 0.25 W/(m²K)) were tested in a hot box–cold box apparatus. The measurements and investigations include the relative humidity under the zinc sheeting, the corrosion type, the corrosion product, and the corrosion rate. The influence of a well performing air-vapor retarder below the insulation on the underside corrosion of zinc sheeting is slight for zinc roofs with a good cavity ventilation, but significant if the ventilation is poor. For nonventilated zinc roofs, installing a perfect air-vapor retarder under the insulation only is not sufficient to control the sheeting underside corrosion. Further introducing a dry capillary and sorption active material between the sheeting and the insulation greatly reduces that corrosion.

Keywords

metallic roofs corrosion roofing system condensation

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References

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A Hot Box–Cold Box Investigation of the Corrosion Behavior of Highly Insulated Zinc Roofing Systems

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