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Old 01-28-2012, 11:17 PM   #16
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A couple drywall questions


anything around a tub or shower that is going to have tile over it needs to be some type of backer board made for that purpose and waterproofed. drywall has no place behind tile unless its a backsplash behind a sink. in a lot of places you arent allowed to install drywall around a tub or shower. the only exception is if you are using schluter kerdi you can use drywall because the kerdi is waterproof.

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Old 01-29-2012, 12:52 AM   #17
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A couple drywall questions


I must have seen at least 1000 bathrooms tiled over regular drywall. None had any damage on the tilework caused by the drywall, or on the drywall. The worst I've seen is soft mud and tape at the ceiling corners, which gets fixed as soon as the bathroom user learns to turn on the fan and the corners get patched and repainted.

The cement board lobby must be very powerful!
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Old 01-29-2012, 12:58 AM   #18
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A couple drywall questions


I don't believe in cement board. I think it's garbage.

I also don't believe that you absolutely can't use drywall because you can. However, you really shouldn't. At minimum you need the aqua to help deal with the water when your tub/shower surround leaks and it will. Whether it's tile or an Acrylic surround sooner or later it will leak and you will have water at the drywall. So what happens then? The drywall absorbs the water, and begins to weaken all while mold sets in... over time everything falls apart. The aqua board is more resistant to water, but it's not water resistant completely. Leave a sheet in the rain and you'll find out. Aside from that I may be wrong but I believe the Aqua (green) board has mold inhibitors.

What should be used is Vinyl Faced Tile Backer. You simply can't go wrong and it's EASY to work with.

I always shake my head when I see people insist on Concrete board. Concrete board is a joke. The stuff is a pain to cut, a pain to screw and you end up with MORE joints (more places to leak) because the sheets are smaller.... and the sheets are smaller because the junk weighs so much. It's old technology... forget it... it's time has passed!

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Old 01-29-2012, 03:43 PM   #19
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A couple drywall questions


its amazing how so many people know so little.

The people arguing that its ok to use drywall in the tub area are wrong its not ok. just be cause that's the way it used to be done doesn't mean its OK any more. Do you know that they used to build houses with no insulation? yeah they did and that's wrong now too.

Green board (moisture board) is garbage but better than nothing. there have been tests done to study this and in some places is not permitted.

Mold/Moisture board is completely different and it comes in multiple colors including blue, purple and guess what GREEN!

Entirely different than the original green board. the colors are manufacturer specific.


Oh yeah they dont make cement board in 3'x5' because its heavy. The box stores sell that size because it fits the average tub surround with minimal cutting. You can get cement board in 4'x4' or 4'x8' or 4'x10' in both 1/2" and 5/8".
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Old 01-29-2012, 03:46 PM   #20
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A couple drywall questions


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Originally Posted by abracaboom View Post
I must have seen at least 1000 bathrooms tiled over regular drywall. None had any damage on the tilework caused by the drywall, or on the drywall. The worst I've seen is soft mud and tape at the ceiling corners, which gets fixed as soon as the bathroom user learns to turn on the fan and the corners get patched and repainted.

The cement board lobby must be very powerful!
The tile doesnt get damaged. The wall gets wet from the moisture wicking through the grout. the wall eventually softens up and becomes brittle and falls apart.

I guess you use mastic in the shower area too?
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Old 01-29-2012, 03:47 PM   #21
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A couple drywall questions


Quote:
Originally Posted by dberladyn View Post
I don't believe in cement board. I think it's garbage.......

.....I always shake my head when I see people insist on Concrete board. Concrete board is a joke. The stuff is a pain to cut, a pain to screw and you end up with MORE joints (more places to leak) because the sheets are smaller.... and the sheets are smaller because the junk weighs so much. It's old technology... forget it... it's time has passed!
That's nice. However, it is just your personal opinion.

My Tile Supplier (2nd generation tile guy that sells to the trades & public - and also installs) uses nothing but CBU for the substrates.

We will also stick to CBU for substrates. Easy to cut & quick to install when you know what you are doing. Much more stable substrate - over other products. Nothing wrong with adding other membranes and membrane systems over it.

We did 3 master custom-bathroom tile showers last month. Got another 1 coming up in 1 week, and many more scheduled for 2011, including a steam shower unit in an owner's spa suite. = CBU for all of them!
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Old 01-29-2012, 04:23 PM   #22
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A couple drywall questions


Everyone's opinion is different. I've done both. Cement board is absolute garbage compared to Vinyl Faced Dens-Glass (Tile Backer).

Opinions... but I and all the people I work with ARE the wall and ceiling industry. The builders we work for are among the best. I wouldn't expect Tile Setters to know about building walls, just as I suppose they wouldn't expect me to know about Tile.

Anyways do what makes you happy. I'll gladly stay away from that crap... because to me that's what it is.
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Old 01-29-2012, 05:24 PM   #23
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A couple drywall questions


Are there not building codes for this?
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Old 01-30-2012, 03:35 AM   #24
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A couple drywall questions


I always tile over concrete board, with a waterproofing membrane, if it is a tub surround or a shower. I use moisture resistant drywall for the rest of the bathroom.

I didn't even think about this when I posted at first. I just thought it goes without saying that no one tiles over drywall of any kind.

I have never tiled over greenboard. I think it could be done, but at the risk of inevitable decay and mold a few years down the road.

Leave a sheet of greenboard outside in the rain for a few months. Do the same with some wonderboard. Compare what they look like.

That tile backer stuff could be ok with a vinyl layer or whatever. Still, I prefer concrete board.

And someone else pointed out the convenient sizing of the 3'x5' sheets. They are ideal for tub surrounds.

You can score it a few times with a sharp razor blade, and break it like drywall. It is fairly easy to work with, and I never found it to be unreasonably heavy.

Peace.
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Old 01-30-2012, 10:22 AM   #25
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A couple drywall questions


Great thread. Proof, positive, that both Hangers and Setters came by their reputations honestly.
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Old 01-30-2012, 03:43 PM   #26
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Originally Posted by southshoreconst View Post
The tile doesnt get damaged. The wall gets wet from the moisture wicking through the grout. the wall eventually softens up and becomes brittle and falls apart.

I guess you use mastic in the shower area too?
Reality contradicts your statements.

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