RH Numbers Rising - Printable Version
+- Concrete Moisture Measurement Forums (http://www.wagnermeters.com/concreteforum)
+-- Forum: Concrete (/forumdisplay.php?fid=1)
+--- Forum: Moisture Measurement in Concrete (/forumdisplay.php?fid=2)
+--- Thread: RH Numbers Rising (/showthread.php?tid=119)
RE: RH Numbers Rising - Ernesto - 04-20-2011 07:58 AM
(04-18-2011 05:15 PM)CC Solutions Wrote: There are portable HVAC units to heat and cool buildings, but the GC doesn't want the cost. I wish they could understand the importance of maintaining correct conditions during flooring installation.
Had that problem for all the years I worked for builders. Even the guys building milti-million dollar homes. I would have to carry copies of standards to show them.
RE: RH Numbers Rising - CC Solutions - 04-20-2011 08:02 AM
I can tell you it's a much bigger issue in hospitals with ICU's and TB rooms, the ductwork comes sealed in plastic and remains 'clean' until started up once the building is clean. If a commissioning agent finds dust in the supply ducts they may need to be cleaned. Now just imagine what it takes to clean tens of thousands of feet of ductwork.
RE: RH Numbers Rising - rthompson - 04-20-2011 05:15 PM
It is absurd to attempt to moisture test in an unconditioned enviroment.
If the slab temp is lower than the ambient temperature the moisture will migrate into the slab, causing an increased moisture content. The HVAC may not be on but the slab temp better be about 65 degrees or higher.
RE: RH Numbers Rising - CC Solutions - 04-20-2011 09:00 PM
Typically slab temperatures for slab on grade are around 67 - 69 degrees, where the ambient room temperatures are 72 - 75 degrees. The slab is in contact with the ground which in most instances will be 58 - 62 degrees.
Unconditioned is a term meaning uncontrolled, yet many spaces are 'controlled' by means other than operating HVAC systems.
RE: RH Numbers Rising - Ernesto - 04-23-2011 07:01 PM
Ray, it's about time you made it here. Be careful, these guys know what they are talking about....most of the time.
RE: RH Numbers Rising - rthompson - 04-23-2011 07:59 PM
There are companies that specilize in drying, heating and cooling buildings. the GC has to realize the monetary impact to him for nonconformance.
RE: RH Numbers Rising - CC Solutions - 04-23-2011 08:59 PM
Ray, you are right, but the burden is placed on the installer to provide conditions conducive to flooring installation. Even though it is out of his hands!!!!
RE: RH Numbers Rising - rthompson - 04-23-2011 10:01 PM
I agree, but it is way past time for change. There was a time when this did not exist, but we allowed it to happen and now its our problem.
RE: RH Numbers Rising - Ernesto - 04-24-2011 08:24 AM
I can agree that all the new slabs going in be warranty's by the people who place it for excessive emissions, but all the old ones out there will still continue to have problems. Even to this day the courts make installers liable for changes in slabs emissions and flooring failures. They need training too.
I don't mind testing slabs, I actually like it, it's easy money. But thats not the whole evaluation process either.
RE: RH Numbers Rising - eaadams - 09-08-2011 06:08 PM
(04-18-2011 04:46 PM)eaadams Wrote: I just had a GC in Los Angeles tell me they can't get the building acclimated because they can't get heat on until they get the occupancy permit and cant get occupancy permit until flooring is done ....
Same GC's rH tests by George Donnelly just came in at 99%.
FYI learned he uses Vaisala equipment not Wagner.
Can't a slab ever just be dry 12 months later