A hot box-cold box investigation of the corrosion behavior of highly insulated zinc roofing systems

R. Zheng, J. Carmeliet, H. Hens, A. Janssens, W. Bogaerts

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Abstract

This paper investigates the effect of roofing systems on the humidity-induced corrosion of zinc sheeting in highly insulated zinc roofs. Ten types of roofing systems (V <0.25 W/(m2 K)) 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.
Original languageEnglish
Pages (from-to)27-44
Number of pages18
JournalJournal of Thermal Envelope and Building Science
Volume28
Issue number1
DOIs
Publication statusPublished - 2004

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