UL 1897

This new edition of ANSI/UL 1897 is being issued to clarify that positive and negative pressures are both able to be used in testing; and to specify size requirements for test assemblies that use mechanically-attached membranes.

1 Scope

1.1 The test method specified in this Standard is intended to provide uplift resistance data for the evaluation of the attachment of roof covering systems to roof decks by using differential air pressures. It is applicable to any type of roofing system which is adaptable to the test equipment.

1.2 The test evaluates the roof covering systems method of attachment, including all components such as base sheets, ply sheets, slip sheets, membranes, etc. and insulation, if used. Supporting roof decks are evaluated only with respect to span conditions and physical properties such as gauge, yield strength, grade, size and/or species of lumber and related factors which affect fastener attachment or bond strength.

1.3 This test method provides a comparative measure of the uplift resistance for roofing systems by means of static differential pressure. The method does not necessarily simulate the actual dynamic uplift pressures encountered by roofing systems. Uplift pressures on a roofing system are dependent upon many factors such as wind gusts, building shape, edge configuration, and the terrain surrounding the building. A method to calculate the uplift pressures on roof assemblies is contained in the Standard for Minimum Design Loads for Buildings and Other Structures, American Society of Civil Engineers, ANSI/ASCE 7.

1.4 The purpose of this test method is to provide data regarding the securement of the roofing system to the roof deck based upon a short-term static load. For information regarding uplift resistance of complete roof deck assemblies including the roof deck and its attachment to supports refer to the subject category Roof Deck Construction (TGKX) in UL's Buildings Materials Directory.