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+--- Thread: Convert from lbs.per 24 hours to RH% (/showthread.php?tid=39)
Convert from lbs.per 24 hours to RH% - CFI - 12-06-2009 03:00 PM
Is the a chart or a formula that would convert lbs. per 24 hrs to RH%?
It seems that there are still some flooring products that specify lbs/24 hours rather than RH%.
Thanks
CFI
RE: Convert from lbs.per 24 hours to RH% - ChrisC - 12-08-2009 02:31 PM
not that i've found. it would make my life a whole lot easier if there was one. i have had to call my adhesive mfg to get their RH specs because they hadn't updated their manuals. good luck.
RE: Convert from lbs.per 24 hours to RH% - CC Solutions - 12-16-2009 11:51 AM
There is no correlation between RH and emission.
I can create a slab with a 2lb MVER and 98% RH, and I can create a slab with 8lbs MVER and 50% RH. And believe me, I've seen both of these extremes and repaired both of them!
The MVER is readily affected by external conditions. Think of a drywaller spilling water on the floor of a very dry old slab. MVER will shoot through the roof, while RH will be unaffected.
Now consider a slab with a blotter under it, or no vapor retarder. It may show great MVER, especially if it is unfinished in a dry building, yet the RH could be 90% or more. If you put a moisture sensitive floor over this slab, you will have problems even though you had great CaCl tests.