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  • historical building renovation
    Cestari, C. B. and S. Cravero And S. C. C. Lombardi, (1999), The problem of the durability of materials used in the rehabilitation of historic timber roofs- rehabilitation of historic timber roofs



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  • What is the difference between permeance and permeability?



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    		Essay:

    vapor permeable membranes

    The most up-to-date suggestions, to prevent problems with use of vapor in renovation, address the use of membranes, that are waterproof yet permeable to vapour, placed on top of the insulating material. Furthermore, an under roofing ventilation may be considered, even if the suitability and the modality of this sort of intervention is currently debated (Kščnzel and Grobkinsky 1989).

    The industry has developed several types of permeable membranes offering a wide range of mechanical and permeability features. These materials include Tyvek?, which provides good tear resistance and vapour permeability, with permeability considerably higher (~ 400X greater) than those offered by the more common micro-pore polyethylene film membranes.

    These features appear unaltered over the medium to long term. This membrane was chosen for the present intervention.



    CRDBER, at CBS, BCEE, ENCS, Concordia,