Quoted:
YES, you absolutly need felt!! Use 15# felt for a bullet-proof moisture barrier.
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(Figured I'd start a new thread since we're not talking about the plumbing anymore. And for those not in-the-know, I'm retiling the shower in my guest bathroom.)
I went down to Lowe's this afternoon and am now armed with approx 54 sqft of tile, #15 felt, roof sealant, cement backerboard, trowels, grout floats, grout, thinset morter, mesh tape, chalk line, framing square, grout sealer plus some other items. About $490 into the project so far. I'll probably be renting a wet saw for cutting tile when the time comes.
While I was out seeing K-19 (decent movie, but too long), my wife scraped off the silicon sealant from the edges of the tub. Guess I'm going to have to do something nice for her now. [:X]
It'll mostly be 4x4 white tiles for the field, but the top will have a decorative border (see pic) and I'll throw in a few 4x4 tiles with the same pattern in a few as-yet undecided spots.
[img]http://www.petenelson.com/Photos/Misc/House/Retiling%20Guest%20Bathroom/11%20-%20Sample%20tile%20pattern.jpg[/img]