Method of Studying Dimensional Movement in Wood Floors in Response to Moisture Changes

A method of placing a 4- by 4-foot floor section over a water-filled pan was found to simulate the dimensional movement of wood floors in actual service. The floor section was sealed over the lip of the pan with a silicone rubber building sealant, and the pan was filled with water to a depth of 6 inches. A small blower was operated continuously to prevent stratification of the moist air inside the pan. The pan-floor assembly was exposed in an air-conditioned room which provided relatively constant conditions (70-75?F, 50 percent RH) on the upper side of the floor, while uniformly damp conditions prevailed on the lower surface. Moisture probe readings and dimensional data, as well as psychometric measurements in the simulated crawl space and in the exposure room, were periodically observed and recorded.

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