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Unread 01-18-2020, 08:47 AM   #16
speculative mason
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Thanks so much for the responses and i apologize for my delay in responding.
Between work and this ever-increasing project i have no time.

That unmodified mortar dries fast.
Ten minutes in pushed some deck mud exposing the thinset and it was hard.

And now after further research i see you can use unmodified thinset with the
Durock shower system membrane.

Does unmodified take longer to set?
I sure would like to switch.
Is adding the liquid modifier any different than the pre-modified stuff?
The Mapei unmodified stuff i have is gray if that makes any difference.
It will probably be light grout if that makes a difference for thinset color choice.

I would like to use a slow setting thinset as i have to trowel the whole wall at once.
Is this thinset for installing the membrane to be pretty loose mix too?

Thanks again.
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Unread 01-18-2020, 11:11 AM   #17
speculative mason
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Ok, i read this ~ https://www.johnbridge.com/vbulletin...ad.php?t=49926
and definitely want to use a white thinset.
The floor is light natural stone, lime or marble of some sort.

Think i'll just get the best Mapei white modified thinset at Lowes (only place close) and use it for everything, large rectangular wall tile, small natural light floor, and the membrane?
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Unread 01-18-2020, 11:41 AM   #18
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Niche in wall facing garage?

Hi,

Sorry, i know we are supposed to keep posts confined to one thread on project
but doing a search does not come up with a specific thread about this issue
and would require weeding through "shower project" threads.

Can i put a niche in a wall facing a garage in Minnesota.
It's heated garage. Two by four walls.
There is 5/8 rock covered by OSB.


Thanks
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Last edited by speculative mason; 01-18-2020 at 11:46 AM.
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Unread 01-18-2020, 12:34 PM   #19
speculative mason
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I don't need an answer as we decided to reroute the shower head line and
put the niche above the valve but someone else may want to know.
Attached garage walls i am getting conflicting information on whether they
are considered exterior.

Cheers
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Unread 01-18-2020, 01:37 PM   #20
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If the garage space is conditioned by a thermostatically controlled system, with the same type of duty cycle as a typical home system, I'd consider it interior.
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Unread 01-20-2020, 07:53 AM   #21
speculative mason
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The wall is not noticeably cooler touched from teh inside and i am sure
it would have been fine to do the niche there but it's in the shower valve wall
now.

I am going to put the Durock membrane on tonight, knock on wood, and
am concerned about what thinset to use.
Someone in another thread said they had a failure using Mapei which is the
brand i am going with for everything since Lowes is real close to the house.

Not tied to it by any means though but already bought some unmodified Mapei
thinset.

1)Any suggestions for a thinset for Durcok shower system membrane?
Preferrably a real slow one.
I was going to wrap is horizontally around the shower creasing the corners forgoing the 5" band they sell for the corners to limit the seams leaving a large section to have troweled out and i am very slow.

2) Does using the membrane eliminate the need for the mesh tape?
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Unread 01-20-2020, 08:09 AM   #22
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Oh, and i only bought a pair of inside corners and can't wait to order more
for the niche.
Can i just Redgard it and then membrane over that?
It's real busy with all the corners in a small area.
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Unread 01-20-2020, 08:46 AM   #23
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If Lowes is your source then I'd probably use this to install the membrane:

https://www.lowes.com/pd/MAPEI-Porce...Mortar/3743821

I used Versabond, from Depot, which is similar to the product above.

As a novice to installing water proofing membrane I, but maybe not you, would opt for installing manageable sized sections and using the band instead of attempting to cover multiple walls with a single sheet. No matter what you do you'll still end up with overlaps in various places.

But, you could try to pre-crease it where the inside corners are, dampen the wall board with a sponge so it doesn't draw the moisture out of the mortar, then apply your mortar, say, 2' out from the corner, hang the sheet - being sure to smooth both sides out away from the corner so you don't force too much mortar into the corner, apply another 2', smooth, repeat. As you smooth it be sure doing so isn't pulling it away from the corner.

Doing manageable sections will help prevent the mortar from skinning over on the walls.

Correct, if you're installing a membrane you don't want to install mesh tape.

You'd not want to RG the niche and then membrane over it. Stick with the membrane system. IMO, if you don't have all your materials wait until you do.

My .02.
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Unread 01-20-2020, 10:43 AM   #24
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George, when using the Durock Shower System membrane, I'd recommend you not wait to order any pre-formed corners. Their pre-formed corners are substantially thicker than their membrane and not as easy to install as the membrane. The membrane folds well enough, and takes a crease well enough, that I don't use pre-formed corners at all when using that membrane. Just fold your corners carefully and you'll be fine. Put a little dab of 100 percent silicone or KerdiFix or similar pookey in the corner if it makes you more comfortable, but if you've folded those corners carefully they won't leak at all.

My opinion; worth price charged.
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Unread 01-21-2020, 08:17 AM   #25
speculative mason
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Thanks for the great tips.
I chickened out last night.
Worried i will miss some crucial information.

1) Does wetter, looser thinset extend open time on the wall at all? 1a) ok to do
under membrane?

2) I bought a non-modified thinset designed for membranes but it dries real
fast in my experience and in the comments.
Does non-modified typically dry faster than modified?

3) Using the liquid additive with non-modified vs modified in powder in the bag?
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Unread 01-21-2020, 08:42 AM   #26
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I don't know if unmodified mortar dries faster than modified, I've only used modified, and my personal experience is limited.

I have read here that there are several types of modifiers used in mortars, perhaps the most common being latex, and I suspect that might be what you have in that bottle. I've read, too, that latex modified mortars take longer to dry because they require some air to do so (consider how latex paint will stay liquid for quite some time in a sealed container, but mixed mortar won't), than do other formulations, so if applied under a fairly effective air barrier like your membrane a latex modified mortar will take longer to dry.

In the grand scheme of a bathroom remodel mortar is pretty inexpensive. for novices there's enough self imposed stress once you mix a batch of mortar, no need to add to it wondering if what you're using is truly fit for purpose.

Yes, you can mix the mortar a bit loose for the membrane, which should buy you some time before it skins over. Dampening the wall board will too.
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