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Hygrothermal performance of buildings. Resistance to wind-driven rain of roof coverings with discontinuously laid small elements. Test methods Ingestion-build-89079 BS 3993 concludes with the1 Scope This Techncial Report describes a method of test for determining the resistance of pitched roof coverings to wind driven and deluge rain. The test method is applicable to discontinuously laid unsealed small roof covering elements such as clay tiles, concrete tiles, slates, fibre cement slates and stones. NOTE The test method may be adapted for fittings.