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Sheathing Papers

Damp-proof casings and methods of providing against damp are matters which concern the structural engineer, if only in some stages of his task, and Messrs. F. T. Carson and F. V. Worthington, in the July issue of the “Bureau of Standards Journal of Research" have furnished much valuable data, which might well be used in the formulation of a standard specification. The work was carried out at the request of the National Lumber Manufacturers’ Association and 36 samples of building papers, consisting of asphalte-saturated, paraffin-saturated, laminated and asphslte treated and machine finished papers, were tested for weight, thickness, tensile-breaking strength, bursting strength, tearing resistance, water resistance and air-permeability.