1. Scope 1.1.This test method applies to the calibration of handheld moisture meters for gypsum board, glass faced gypsum panels and fiber-reinforced gypsum panels by means of electrical conductance and dielectric meters. The test uses wetted test specimens which are dried down in at least 5 steps to determine the moisture content based on the weight loss in comparison to the dry weight. The test also supplies the ERH values for each of the drying steps. 1.2.This test method applies to the field use of hand-held moisture meters at storage and distribution facilities, construction job sites and in buildings. 1.3.This test method has not been evaluated for the influence of paint or wall covering materials on the indicated moisture content of a gypsum board or panel substrate. 1.4.This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Accurate and correct moisture content measurements of gypsum board is often needed on samples in situ. Moisture meters that are typically designed for use on wood and that have not been calibrated for use on gypsum board are commonly used and yield spurious results. No guidelines are available to direct the users in the proper procedure for calibrating the meters for this use. This proposed new standard will fill that gap.
Keywordsconductance meters; dielectric meters; moisture content; moisture gradients
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Ballot Item Approved as C1789-2013 and Pending Publication