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03-14-2013, 02:09 PM #1
jim decker Concrete Moisture Enthusiast *
Status: Offline Posts:40 Threads:3 Joined:Nov 2011
I have been approached to insert 225 probes in a new school in El Paso. I generally charge $90 a probe but in a job of this size what would normally be the going rate? I have done work for the flooring contractor with no problem but what do you all think. This would be a hugh job and I want to be fair but ....................

03-16-2013, 04:41 PM #2
CCR Concrete Moisture Coach ***
Status: Offline Posts:236 Threads:14 Joined:Dec 2011
Depending how many you can place per day, I would charge $60 - 65 each. That's a very fair price. Much depends also on your mobilization/travel costs, whether or not it's open space, multiple floors, and how efficient your reporting format is structured. Alone, I can realistically place and document 25-30 per day.

On a job that size, I'd bring in another ICRI Certified Tester to help.

Good luck

JK Nixon
Concrete Restoration Services, LLC
Pittsburgh, PA
http://www.rhtester.com

03-17-2013, 07:49 PM #3
jim decker Concrete Moisture Enthusiast *
Status: Offline Posts:40 Threads:3 Joined:Nov 2011
Thanks I was thinking along those lines. I am the only guy in El Paso or a 200 mile radius that does concrete testing it appears. I do testing for IFTI also.

03-19-2013, 06:41 AM #4
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
When someone approaches me for a quote on a large job and they are price shopping, I always have to reverse engineer my pricing to be sure they are getting their money's worth.

JD Grafton
Concrete Answers for Flooring Problems
JGrafton@ccsolves.com

03-19-2013, 09:35 AM #5
jim decker Concrete Moisture Enthusiast *
Status: Offline Posts:40 Threads:3 Joined:Nov 2011
Here in El Paso it is so dry most readings are 2% moisture content for wood 4.5% is allowed. No ground cover anywhere in crawl spaces. No ground cover under concrete. BUT once and a while an architect will mandate it and then they call me. IFTI gives me a half dozen jobs a year also.

03-19-2013, 08:38 PM #6
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
No vapor retarder under concrete can end up being a disaster. Especially in buildings that are dehumidified often.

It's always best to take the ground out of play no matter what the soil looks like. Wink

JD Grafton
Concrete Answers for Flooring Problems
JGrafton@ccsolves.com

03-20-2013, 07:42 AM #7
jim decker Concrete Moisture Enthusiast *
Status: Offline Posts:40 Threads:3 Joined:Nov 2011
Oh, I know that I am originally from New Hampshire but in El Paso relative humidity 15% the last 3 months on average. When I drill through the concrete to determine slab thickness I have yet to see ground cover under concrete commercial or otherwise. Rainfall not sure but maybe 1 foot a year. Water from Rio Grande and real deep wells here.

03-21-2013, 11:50 AM #8
CC Solutions Concrete Moisture Evangelist *******
Status: Offline Posts:1,065 Threads:69 Joined:Dec 2009
While ambient atmospheric relative humidity may be low in desert climes, I have been taught to always consider the RH of soil to be 100%.

Slabs can become very dry when exposed to these low relative humidities and ground moisture is usually not an issue until slabs without vapor retarders beneath them are covered with a less permeable or moisture-sensitive floor covering.

The floor covering can retard the vapor emission from the slab and moisture can accumulate. Suddenly a slab that has been bone dry for years has moisture problems!

When installing moisture sensitive flooring on a slab on grade always check the RH, and verify the presence of a functioning vapor retarder immediately beneath the concrete. This is a requirement of nearly all manufacturers of moisture sensitive flooring and adhesives. Wink

JD Grafton
Concrete Answers for Flooring Problems
JGrafton@ccsolves.com

03-21-2013, 05:08 PM #9
CCR Concrete Moisture Coach ***
Status: Offline Posts:236 Threads:14 Joined:Dec 2011
Sound practice. Plain and simple.

JK Nixon
Concrete Restoration Services, LLC
Pittsburgh, PA
http://www.rhtester.com

03-22-2013, 08:45 AM #10
jim decker Concrete Moisture Enthusiast *
Status: Offline Posts:40 Threads:3 Joined:Nov 2011
JD you are right regarding RH to MC comparatives there is no lineal direct correlations see pdf file attached. My bad!
.pdf tramex.pdf Size: 108.05 KB  Downloads: 5








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