"WirelessNut" wrote in message
oups.com...
Where in the sandwhich would the "roll of waterproof sealer" go (as you
mention in #8)? On top of the concrete board? This is in addition to
the roofing felt, yes?

I wouldn't use it. Not really nesecary. if you did it would go behind the
backerboard, in place of the roofing felt. Nothing should go between the
tile and backerboard except the thinset or mastic.