Earlier this month, ASTM International published its revised ASTM F2170, Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using in situ Probes. The updated standard reduces the mandatory wait period before obtaining official, documentable results from an in-situ relative humidity (RH) moisture test performed in concrete floor slabs from 72 to 24 hours.
A masonry cavity wall system must successfully perform multiple functions throughout the life of the building. A proper wall is expected to manage moisture, air, and heat, contain fire, and hold up the structure itself.
Although many roof designers and construction professionals understand the basic meaning of the Dew point temperature, there remains a real need for greater awareness about how to accurately perform and demonstrate the necessary calculations.
In modern buildings, there tends to be moderate tolerance for design/construction errors affecting thermal performance, air leakage, and moisture migration. This is primarily due to the typically low interior moisture levels found in these types of projects and seasonal variation in exterior conditions.
Moisture presence in concrete slabs can cause problems for all types of floors, including carpeting, wood, stone, poured polymeric, and resilient finish. Too much moisture can cause floorcoverings to cup, buckle, blister, and discolor, and these problems can occur days, months, or years after installation.
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