SSPC Guide 23, Field Methods for the Determination of Moisture in Concreteand Masonry Walls and Cei

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 This Guide describes five common field methods for the determination of moisture content in painted and unpainted exterior concrete and masonry walls (CMU, brick, stone [manufactured and natural], poured-in-place, pre-cast, and tilt-up), Exterior Insulation Finishing Systems (EIFS), stucco, and concrete and masonry ceilings (panels, planks and cast-in-place). Many of the ASTM test methods cited in this Guide were developed for use on floors, but the methods are also suitable for use on walls and ceilings. References to relevant industry standards and recommendations for selecting test locations, frequency of testing, and acceptance criteria are provided. Methods other than those included here may also be suitable for use.

The Guide includes generic descriptions of equipment used to obtain measurements, conditions necessary for performance of the test, test procedures (referencing ASTM standard test methods where applicable), and additional considerations that could affect the test results. Suggested test frequencies for each of the five methods are provided. The Guide includes a table comparing the suitability of each of the test methods for use on each of eight types of substrates, and compares the substrate depth assessed by each of the test methods and the reporting units.  A laboratory procedure for moisture saturation testing of walls is described in the non-mandatory appendix.  

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