I am doing an lvt floor and used Mapei tradeplan over ceramic tiles after priming with prim grip. I did this on the Friday and went back to fit on the Monday. I had checked with the Tramex before I did the screed and it was ok but on the Monday some areas were over 6 on the reading. Fortunately the customer changed the design she wanted and I had to order some new design strips. I went back yesterday to fit and the readings were well within limits this time. I was just wondering what might have happened had I fitted it on the intended day.
Had this a couple of times myself. Last time I'd used Ardex Na but still read high next day. Potentially the floor could lift but not had it happen to me YET.
most compound manufactures work out there drying times on a climate of 55%rh air moisture at 21c. They also work out drying times on the sub-floor being absorbent. in your case the sub-floor is not absorbent so will hold moisture for longer to dry out. Ideally twice as long so 48hrs drying maybe required. However you will still have high readings after 48hrs but it is nothing to worry about as its not a large amount of moisture build up that your waiting to dry out. You can still fit the flooring as the compound will dry out before any adverse effect of the flooring and adhesive.
I've had the same problem today screeded floor yesterday only 12 Sqm turned up today and floors still wet all over warm house air flow through windows etc got to go back tomorrow to install.
do you have - air rh reading temperature subfloor temp what was you going over? if you know the above them you can get a idea of drying times and i can help you get a idea of drying times.
I had this problem a few years back. I screeded a job and the couple were on holiday so I had the keys so had to lock doors and windows. Green bag screed not dry for 2 days so rang f.ball tech up. They said heating in will help but good airflow is the key. So I went there and stayed a few hours opens all doors an windows and put fans blowing the air out of the rooms. Was dry in a few hours. As the moisture rises out of the screed and up if it can't get out it will fall back on the floor.
