Page 6 - 2018-02-CFR Volume 113 -The Magic Of Interim Maintenance Procedures - February 2018

by Wagner Meters
FOR IMMEDIATE RELEASE

CONTACT: Jason Spangler
EMAIL: jspangler@wagnermeters.com
CALL WORLDWIDE TOLL-FREE: (800) 634-9961 ext. 235

ASTM F2170 Update Allows Official RH Test Results at Just 24 Hours
Response to new science proving results taken at 24 and 72 hours are essentially identical

Rogue River, OR (February 14, 2018) – The international standards organization, ASTM
International, published today its revised ASTM F2170 (Standard Test Method for Determining
Relative Humidity in Concrete Floor Slabs Using in situ Probes). The updated standard reduces,
from 72 hours to a scant 24 hours, the mandatory wait period before obtaining official,
documentable results from an in situ relative humidity (RH) moisture test performed in concrete
floor slabs.

This significant reduction in wait time allows contractors and flooring installers to take action on
RH test results a full two days earlier than the ASTM F2170 standard previously allowed. It also
should enable contractors and flooring professionals to accelerate their construction and
remodeling projects accordingly.

ASTM International updated the industry standard for measuring the moisture condition of
concrete slabs in response to an ASTM-commissioned Precision and Bias (P&B) interlaboratory
study conducted in 2014. That study documented the temperature and RH readings of in situ
RH probes at various times within the old 72-hour window, including at the 24-hour mark. The
study’s findings confirmed that the readings obtained at 24 hours were statistically equivalent to
readings taken at 72 hours.

“Everyone at Wagner Meters is excited about the change to 24 hours, but we weren’t that
surprised,” said Jason Spangler, Flooring Division manager at Wagner Meters. “Our own
internal testing with the Rapid RH® system has long shown essentially identical results between
the 72-hour and earlier readings.”

“What’s a game changer for flooring professionals is that with the revised F2170 standard, they
can now take action after just one day instead of having to wait three days,” emphasized