Floor Leveler Cracking

Floor Leveler Cracking — modern flooring photography

Q: Adding a basement bathroom, painted concrete floor, going to add ceramic tiles. Used latex bonding over the painted floor, allowed to dry according to direction, mixed flooor lever as per direction, poured to cover 5 X 10 floor area. allowed to dry as per directions, left the floor to do other work came back 2 weeks later and noticed some cracks starting to appear in the leveling compound, decided to wait longer to see if any more appeared, and they have.
Question: can i continue to put the tiles down over the cracked lever or must i take it up?? Or is there a fix??
Mike

A: Typically when cracks like this occur it is for one of two reasons. Either A) the mix was a bit off or B) the leveler dried incorrectly, usually if a room is too warm or cold, but typically its when it dries too quickly as the moisture in the mixture escapes too quickly. Now since you mentioned you followed directions, my guess is this is most likely temperature related in the room, rather than mixture. Make sure the room sits around 65 degrees Fahrenheit while you give the leveler proper time to cure. Unfortunately this does mean that you will need to take up all of the current leveler and mix up a new batch then pour it out and allow to cure.
After you have cleaned the concrete you are leveling, make sure it is dry before putting your leveler on. Also, it might be advisable to remove the paint on the concrete if possible. This is a bit of extra work and not necessary, but it can remove potential problems if the latex bonding has any issues.