Condensation and moisture transport in cold roofs: effects of roof underlay

Emmanuel A. Essah, Chris H. Sanders, Paul H. Baker, Angela S. Kalagasidis

    Research output: Contribution to journalArticle

    Abstract

    Cold pitched roofs, with their form of construction situating insulation on a horizontal ceiling, are intrinsically vulnerable to condensation. This study reports the results derived from using a simulation package (Heat, Air and Moisture modelling tool, or HAM-Tools) to investigate the risk of condensation in cold pitched roofs in housing fitted with a vapour-permeable underlay (VPU) of known characteristics. In order to visualize the effect of the VPUs on moisture transfer, several scenarios were modelled, and compared with the results from a conventional bituminous felt with high resistance (200 MNs/g, Sd = 40 m). The results indicate that ventilation is essential in the roof to reduce condensation. However, a sensitivity analysis proved that reducing the overall tightness of the ceiling and using lower-resistance VPUs would help in controlling condensation formation in the roof.

    Original languageEnglish
    Pages (from-to)117-128
    Number of pages12
    JournalBuilding Research and Information
    Volume37
    Issue number2
    DOIs
    Publication statusPublished - 1 Jan 2009

    Fingerprint

    Roofs
    Condensation
    Moisture
    Ceilings
    Sensitivity analysis
    Ventilation
    Insulation
    Vapors
    Air

    Keywords

    • condensation
    • cold pitched roofs
    • construction

    Cite this

    Essah, Emmanuel A. ; Sanders, Chris H. ; Baker, Paul H. ; Kalagasidis, Angela S. / Condensation and moisture transport in cold roofs: effects of roof underlay. In: Building Research and Information. 2009 ; Vol. 37, No. 2. pp. 117-128.
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    Condensation and moisture transport in cold roofs: effects of roof underlay. / Essah, Emmanuel A.; Sanders, Chris H.; Baker, Paul H.; Kalagasidis, Angela S.

    In: Building Research and Information, Vol. 37, No. 2, 01.01.2009, p. 117-128.

    Research output: Contribution to journalArticle

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    AU - Essah, Emmanuel A.

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    AU - Baker, Paul H.

    AU - Kalagasidis, Angela S.

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