September 2011 Newsletter from Rapid RH
Getting the Vapors: Understanding the Discussion about Vapor Barriers
Anyone that has had to face a moisture problem with a concrete slab understands the damage that excess moisture can cause. Moisture in concrete can occur from a variety of sources: ground moisture that contacts the slab through either capillary action or as water vapor, high air humidity or drastic changes in relative humidity in its environment, leaking plumbing that passes through the slab, and more. Excess moisture can cause pH changes in concrete that adversely affect adhesives. Even an excess of moisture that was retained from the original concrete mixture will cause problems if the slab was sealed prematurely.
Updated: 10 more mfrs specifying RH (ASTM F2170) added to RHSpec.com
Knowing what a manufacturer’s ASTM F2170-Relative Humidity threshold is for a specific flooring product can save you time and money. Last month we showed you a list of major manufacturers and direct links to their installation specifications. Since then they’ve added 10 more. Keep this handy list nearby.
Forum Post: 3/1000 + 1/1000 more
Had an interesting set of rH tests come from a dealer last month.
He is doing lets say ~ 20,000 s/f school building.
One room (gym) is ~4,000 s/f.
He did 22 tests. But for the gym there were 4. So is that per ASTM? Can I use 4 tests for a 4,000 s/f room when the first 3/1000 s/f were done elsewhere in a building and for other finishes?
ICRI Moisture Certification Program
ICRI Moisture Certification Program will be in Denver on September 20-21, Baltimore/Washington on October 25-26 and Seattle on November 8-9. See following link for more information. Part of FCICA? Please contact ICRI Executive Director, Kelly Page at (847) 827-0830
The Rapid RH on the Road
We’re going to the FCICA mid-year meetings in Ft. Lauderdale, FL October 5-7. We look forward to seeing familiar faces and connecting with new ones.