Originally Posted by misterkit
Quick question - did you tile over the concrete expansion joints or is that a laminate? Nice work on the basement!!
I did tile over the expansion joints. There are a few factors to consider here though. If the expansion joints are cut in with a concrete saw, I beleive there is less concern. My expansion joints are trowelled in making them much larger and more of a concern when worrying about shifting......although I'm not sure it ever happens in a basement and if it does, I think there are bigger problems......foundation?????
Now, if your grout joint falls on an expantion joint, you can fill the expantion joint with thinset and put a grout-matching caulk (from tile stores) in that grout joint.
If you have a complete row of tiles falling over the expansion joint, then you need to buy a latex membrane (very sticky and messy, try not to get this on you) and fill the joint with the membrane and have it set up for 24 hours before setting your tile. I believe I saw something like this at Menards, but I got mine from a contractor tile store.
The second scenario is more likely than the first and it's also more expensive (membrane is price stuff).My personal opinion is not to sacrifice the look of your tile for cost. After all, you have to live with it when it's done and to spend a little more money to make it look right is better than saving $100 and not being happy for years to come.