Possible problem

I've got to go to a karndean job than another fitter couldn't complete for screed not drying after a day it were screeded Tuesday with level it purple bag, next day when he were rubbing down it came up in some small areas its a very recent new build which is ringing alarm bells as the floor may be damp, could I take a reading with a hygrometer after a hour that would give me a fair indicator of how damp the floor is? Reason I'm asking is that its due for fitting in the morning.
has far as I'm aware there's been no dpm been put down by the fitter Tuesday. Cheers

 

Difficult one. Bits lifting could be due to several reasons like dust, poor mixing, no primer. I don't use that screed as it's not a quick dryer and according to spec can take up to 3 days. I doubt any measuring device will tell you if the slab is damp rather than just the screed. If you can find out when slab was poured, how thick it is and how long it's been covered you will have an idea of how dry it will be. A way of telling if the screed is still damp ( if you don't have an electrical impedance meter ) is to heat the surface carefully with a hot air gun/welder and see if it changes colour.....if it does, it still needs to dry. Like i said a difficult one

 

Drill it and stick the hygrometer in. It will give a better indication than surface rh.

 

I've not had problems with level it. I screeded 25 sq the other day and was walkable in 2 hours. Not saying its ready to fit on. The only trouble I've had is with fine flow 3000 not drying in time had to walk away from 3 jobs now as still damp so switched to the level it.

 

Yeah call me a wimp but I generally stick with Stopgap 300 and it's never let me down for drying whereas a few others have. They all set quickly but it's all down to drying.

 

Me too only use 300 on my jobs use others on shop work, I've got the survey master so I will scan with that but you can't get the rh reading from it, customers just moved in and are rushing to get it down so I will go through it with them only thing is I'm going to be contradicting what the shop says regarding fitting, wouldn't have these problems if shops did there own readings.

 

Matt I have two digital moisture boxes, but never really been told how to use them, as in when to take readings, how many readings to take, positioning, min & max ect ? whats your advice. I take it they are self calibrating? Mike

 

Had problems over the years with various products, especially in the winter. they look good in the suppliers when your saving £5 a bag but once you've latexed the floor you return the next day to install the floor. Do you take the risk and fit it or wait an extra day and knock the rest of the week out of sync. In the long run your not saving anything. Unless you've got a job were can leave it a few days stick to the products you know and trust, 300 700 and NA for me every time.

 

Went to the job today scanned over with the survey master high readings, drilled the floor and probed in one area high readings again, put the hygrometer on and within the hour it went to 81rh.
If it stays at 81 has anyone fitted at this rh without a dpm, It's only 6 out from being 75rh and fine?

 

I had problems with FastTrack30 last week. Did everything as instructed and it still took 4 hrs to go off. I was at home by then.

 

How much are the iprobes matt? Do you have to buy a whole new meter etc or can it work with my CMexpert?