Date: 9/27/2008 11:19 am EDT
If I interpret your question correctly, you intend to install Avaire tile on the landing, not on the stairs, right?
It sounds like you might have some deflection issues. When you say it "came apart", may I assume you mean the grout cracked and the tiles became loose?
If there is too much deflection, even Avaire tile can experience issues. However, if you check out the Robinson Test videos on youtube (search for Avaire Robinson Test), you will see that Avaire tile can handle significant deflection without tile or grout issues.
A landing or foyer area is very intensive because the foot traffic is "funneled" into very specific spots. Avaire tile has been installed in many, many foyers and has performed well.
Without seeing your application first hand, it is difficult to say with absolute certainty that there isn't a problem Avaire tile can't overcome. However, Avaire tile is designed to handle much more movement than traditional tile.
Thank you for considering Avaire tile!