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Old 05-11-2009, 04:04 PM   #16
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How to waterproof stucco in bathroom/shower?


you could use thoroseal or drylock, too, but i wouldn't in mine

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Old 05-12-2009, 10:02 PM   #17
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How to waterproof stucco in bathroom/shower?


I ended up using Aquron SPT-1200 to waterproof the stucco. I just used a $12 plant sprayer and one coat ($350/5 gal) and the water beads off fine. The surface is still kind of flaky though. It looks great, but I will probably end up tiling it at some point.
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Old 11-04-2009, 08:56 PM   #18
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How to waterproof stucco in bathroom/shower?


I am thinking of doing the same thing. Where did you buy the product Aquron? Do you have any pictures you could post? Why would you tile over it!
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Old 11-05-2009, 06:39 AM   #19
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How to waterproof stucco in bathroom/shower?


What "same thing"? making a shower in stucco or using a sealant on top of what you have?

Up here, we see some stucco on the exteriors of residential and commercial properties but the main knock against 'stucco' - or EIFS - is that, in our climate it is really hard to protect the plaster from the elements of rain and snow, and low temperatures. First, we need insulation and air and vapour barriers on the inside and then stucco requires protection on the outside - in effect making a perfect moisture sandwich - where degradation of the wood or mould growth is accelerated due to the inability of that area to dry. Now down south, you have a different set of problems that make EIFS (known as "synthetic stucco") a better choice because of the problems you don't have...but these stuccos are part of an exterior system - not interior.

The same problems we have up here will be experienced on an indoor shower. First you must prevent water and water vapour from the shower from getting to the structure - so most showers have a waterproof membrane in there somewhere. Then the idea of stucco is to put up a plaster-like application of 2-3 coats of a product which you then must seal to prevent moisture from ruining it from the shower side. Ideal moisture sandwich...the moisture that invariably gets behind the roller-applied "sealants" can't escape - and therefore degrades the structure of the wall. Ticking time-bomb IMO...
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Old 11-05-2009, 08:18 AM   #20
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How to waterproof stucco in bathroom/shower?


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Originally Posted by Rachael View Post
I am thinking of doing the same thing. Where did you buy the product Aquron? Do you have any pictures you could post? Why would you tile over it!
I bought the Aquron from a local landscaping-type place. It was about $350 for 5 gal, and I used about half of it over two stucco bathrooms (one coat - pump spray application, as recommended). I'll take some pics and expand on how it's going over the next day or two.
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Old 11-05-2009, 08:44 AM   #21
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How to waterproof stucco in bathroom/shower?


Thank you for responding. I look forward to the pictures.

To CCarlisyle.....Okay, I see what you mean about the moisture sandwich. But I see a lot of slate showers which I assume have to be sealed also. How do they prevent a moisture sandwich? And tile is glazed which is a seal, right? Maybe I shouldn't use a moisture barrier at all and just plan on resealing the stucco every year?

Thank you for taking your time to reply.
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Old 11-05-2009, 09:33 AM   #22
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How to waterproof stucco in bathroom/shower?


"Sealing" of most showers consists mainly of sealing the tile grout to delay dirt and stains from appearing and to some extent to slow down the penetration of smaller water molecules through it. Now many, many showers are made with ceramic or porcelain tiles (these tiles do not need sealing) and many showers nowadays are tiled with natural stone. Most natural stones you'd want in a shower (travertine, some marble, soapstone, some limestone, one or two slates etc) could use a sealer, again to prevent stains. Some natural stone tiles do not need sealing at all.

Now most slates are inappropriate for shower environments just because of the way they were made, their chemical composition and the reaction of slate to lots of water. Sealed or not, they are just a sad choice for a shower...they might last 5 years - which is a short time for a shower.

As I said, some tiles don't need sealing: for example all glazed tiles are impervious to water - that's why they are used in showers....ceramic and porcelain don't need sealing. they are already waterproof because of the glazing process the ceramics undergo.

No matter how well you seal, all it takes is a pinhole for water and water vapour to get in and cause mould. And it's not a question of "Sealer A" versus "Sealer B" - no matter what you call it, there are only a finite amount of chemical sealers that will do the job on one or two substrates - not all.

But your idea of sealing just from the outside is closer to what you need that anything else; this is because I trust where you are is humid and therefore the air on the inside of your home is air-conditioned most of the time, right? If so, humid air is trying to get INTO your home from the outside and you are best off to prevent that as much as you can with exterior air barriers. If you do so, then the dehumidification of the air via your AC should reduce the humidity the shower creates. You'll get less of a moisture sandwich if your walls are dry right to the outside air barrier.

So look into a good ceiling fan to get rid of the humidity to the outside, make sure your AC is OK and seal the stucco well from the inside...I didn't ask what it is about stucco that you like? texture? why not just put up drywall and put a texture onto that? a lot cheaper and replaceable + same effect
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Old 03-16-2010, 12:27 PM   #23
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How to waterproof stucco in bathroom/shower?


OK, it's been a year now with the two stucco bathrooms. Looking back, I really do like the look, but I'm going to tile over the tub/shower area and leave the rest. It really is a pain to clean and now we have a baby on the way, and the wife doesn't want them getting scratched up by the stucco in a few years.

I already picked up the travertine tiles. Never tiled over stucco before so I'm wondering if there's anything different I have to do? I'm guessing give the walls a really good scrub with bleach a few days before I tile and let everything really dry out. The rep at the tile store called his contractor and said we should be fine.

I included a couple of pics from a year ago when we just finished the stucco.
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Old 03-16-2010, 12:45 PM   #24
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How to waterproof stucco in bathroom/shower?


If you are going to tile over the stucco, that stucco had better be really secure to the backer. If not, it is going to come off and the tile with it.

another problem is going to be the lack of flatness of the walls and such due to the troweled stucco.



I had considered doing something like you did with the stucco only would never have considered stucco. I was considering Tadelakt plaster. I understand there are some synthetic products out there that might be even better.

did you employ a water proof membrane behind the lathe walls and the shower base?
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Old 03-16-2010, 01:20 PM   #25
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How to waterproof stucco in bathroom/shower?


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If you are going to tile over the stucco, that stucco had better be really secure to the backer. If not, it is going to come off and the tile with it.
Membrane, wire mesh, scratch coat, top coat with waterproof additive, sealer. Aside from some minor dust if you rub it good, I think it's on there pretty good. I forget the brand, but I got the good thinset (TEC, I think) from the tile store, not the home depot stuff.

Quote:
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another problem is going to be the lack of flatness of the walls and such due to the troweled stucco.
I went with a small 1" mosaic tile. Should be fine for the wall bends. Hoping I can pull off the recessed soap/shampoo holder areas. Never grouted mosaic before, but I hear it sucks.

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did you employ a water proof membrane behind the lathe walls and the shower base?
I did apply a membrane all around the bath/shower areas. It also has that Aquron SPT-1200 layer of sealant.
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Old 10-29-2010, 04:01 AM   #26
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How to waterproof stucco in bathroom/shower?


We are getting ready to stucco 2 walls inside a walk in shower and around a soaking tub -- I would like to know -- how much marble dust should be added to the the stucco mix. I am going to use Expo Stucco Shower Coat stucco, -- and I purchased marble dust at NPT National pool tile supply. Any advice befor we start would be apreceated
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