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    Stresses and Strains in Roofing Membrane Caused by Substrate Movements

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    A computer program permits the estimation of stresses and strains in multi-ply membranes. This program covers the case of membranes fully bonded on: (1) a concrete substrate: sudden opening of a crack and (2) thermal insulating materials in two different situations: (a) time-linear opening of the joint between two boards caused by the drying of the board and (b) time-sine opening of the joint due to dilatation and shrinkage of the boards (day/night cycles, sun/rain cycles).

    The constituent materials of the roofing are considered as elastic (coated sheets) and viscous (adhesives). The computer program provides a better insight into the operation of multi-ply membranes. It describes also the influence of the properties and dimensions of the constituent materials on the stresses and strains in a membrane as a whole and in its constituents (coating and felt).


    stress and strain calculations, waterproofing membranes, theory, roofing

    Author Information:

    Guay, F
    Engineer, TOTAL Research Center, Harfleur,

    Persoz, B
    Consulting engineer, Paris,

    Committee/Subcommittee: D08.20

    DOI: 10.1520/STP32469S