Date: 5/21/2008 3:08 pm EDT
Sorry! I managed to get my above post out of sequence, it belongs here as a response to Bob H and his comments.
"The grout used by Avaire (tho noted to be flexible grout) IS NOT in fact flexible in the since that it will survive repeated movement and flexing between the tiles that is a result of a substrate that is out-of-tolerance. Elderly mobile homes are notorious for this type of situation. No grout will survive that punishment. Not even Star Quartz."