"Warmboard-R is great! The install is quick and accurate with these light/small panels. I met with our contractor last night and he said the Warmboard-R panels had just arrived on his jobsite, but was surprised at the size. I told him I thought they were the ticket, and why. The [low] waste factor is great and the on-site fine adjustments are sweet. I stand behind everything I said about their feasibility in earlier emails - it's a cool product, and I'm sold!! P.S. The ability to adjust things on site is awesome. We even rose up and put it on a hearth."