Problems with karndean

No. Just hand held device to test moisture. If lack of grinding is the problem though, would expect it to lift everywhere but 2 rooms are ok so far.

 

Did he do a carbide bomb test!!! The poor bastard!!

 

It would probably be a good business going round testing these anhydrite screeds for firms.

 

I came across this screed last year and all my moisture meters where off the scale. The client done a carbide test and it came up dry which wasn't cheap. I had solid wood floor going down so a bit more problematic than karndean but they had ground the floor and touch wood no problems. I will say I fit a lot of karndean , a amtico and the floor prep has to be spot on with this screed and a scraper isn't good enough. He should have a machine.

 

Solid wood! Was it block? Your a brave man

 

sorry meant engineered. I did tell the client if it goes wrong then I won't be held responsible.

 

Lol, I was getting worried for you there

 

I think what we're all agreeing on is that is not the products fault....but installation is suspect.

 

Just an update. The installer has decided that first thing to do is check moisture in floor so he has taken a reading using a box fixed onto subfloor and leaving it for 48 hrs. The reading is 93. Can this be right? Karndean laid in December and hand held meter used by installer then said that it was dry. Even if hand held device inaccurate it would have dried by now would it not?

 

If the digital reading is saying 93, that means 93RH
Which is supremely damp!
Very suspect, that hand held in dec read dry and now 4+months later its reading as damp as could be?....

 

just re-read beginning of thread
When the box was glued to the subfloor (ideally it should be down for 72hrs, not 48)
Was the u/f heating turned off?
If not, even if low, it will give readings that are way off

 

Underfloor off and looks totally dry and no damp smell or anything.

 

I've used a hand held meter on these subfloors that has shown dry and when I put a hygrometer box on the floor it was still very damp. Not sure it could dry out if it's covered with Karndean

 

Are these hygrometers pretty accurate? Would you expect to get reading of 93 when visually it looks perfectly dry?

 

Hygrometers are very accurate. I use them all the time to test suspect floors. As Coolevilangel said it needs a minimum of 72 hours for first reading the read again after another 24 hours.

 

Ok will check again tonigt when 72 hrs are up.

 

It's possible