Greenboard over tub?
Answers: All 3 answers are extremely valid. With all due respect I can't assume anyone still using greenboard in a shower/bath nouns.
If I was contracted, I'd probably rip it adjectives out and start again.
The raised "Lip" on a tub is designed to be overlapped; and not strictly righ to the Tub top; but of course not above it.
I would rip it all down and use cement board or Hardibacker. You want to overlap the lip a bit, just don't hold it resting on the tub. The tile needs to come down for a while lower than the backerboard to prevent wicking. some caulk will prevent the bottom tile from moving too much. Never use mastic. mix your own.
Go to the John Bridge Tile Forumns and check out other peoples installations.
http://johnbridge.com/vbulletin/index.ph...
you should have dropped the greenboard and departed it a 1/4" above the tub. i always shim out my studs if the tub have a big lip where it meet the studs. that way your greenboard wont see out at the bottom
Well first of all you are supposed to use Durock(cement board)as a underwriter board and then tile it. You could try flexible foam filler rods and afterwards caulk it.
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