How well the seams are sealed has more bearing on the water tightness than it being bonded to green board. By acrylic product do you mean cultured marble or sheet acrylic that looks like plastic.They are both often bonded to green rock, but it is the quality of the installation that will make or break the water tightness. Without knowing how it was done, hard to speculate.

The installation will be 3 or 4 weeks off. If I read the contract correctly, I can rescind 10 days prior, if needed. If code now requires cement board backer for tile work, might there be a problem that this is done with greenboard? Can/should I request that they use cement backer?

Anyone else have this done? Would you do it again? Can the surface material tear or break easily?

They say that the commercial strength adhesive percolates behind the seams to form a bonding of the materials.

Your description is unclear as to what you are doing. Rebath is a renovation product with an acrylic face; it isn't a tile backer board. It often has a fake tile pattern in it. If the plastic panel is installed correctly with all the edges sealed you should not have a problem. However, you must replace the sealant if it starts to fail as with any shower installation.

If you are installing tile you should use a cement backer board.

If it is new construction I would recommend using a 1-piece or 2-piece tub/shower unit.

I have no idea what a rescind period or pulling permits has to do with this design issue.

Well, for better of for worse the product will be available for install next week. I guess they sensed I was getting cold feet and hurried up the order. If they do it right, should look very nice with the two custom tub to ceiling corner towers.

According to one of our town inspectors, we don't need a permit. I hope the other one doesn't show up and disagree! I think you are right anvil, that the main thing is to make sure the bottom seal next to tub doesnt fail.