R
RP13
Hi, after some advise if possible! I laid a natural limestone floor in my house over piped underfloor heating. It's a pump screed that had been down for roughly a year and tested super dry on a moisture meter. It's a new system boiler system . So after a year I fitted the heating system turned it on and roughly over a week and a half took it through its paces before shutting it off and leaving to cool for 3 days. I then used keracol primer 2 coats. Before putting the limestone tiles down fully surrated to the floor using the h40 Eco ideal adhesive. I then used bal super flex grout. I left the heating of for 2 weeks after then turned it on at its lowest on both boiler and underfloor heating. I've had about 6 tiles completely crack! Has anybody had anything similar or may have an idea because this one has truly confused me! Never had an issue like this before! Any help would be appreciated!