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Gail,

You said you used mastic, if so, you need to remove the tiles and clean all that stuff off. Depending on any other mistakes, I might suggest more removal. Can you tell us how this project...

Actually... you can certainly bond new tiles over marble (or any ceramic/porcelain), but there's several "if's". Need to know much more starting with the type of subfloor and how it's built. Pics...

You will need to do more than just grind off the paint. Soaps, shampoo, conditioner and body oils have soaked into the concrete. You'll have to do some heavy duty cleaning.

It also sounds like...

Since the tiles are natural stone you can use an enhancing sealer on the tiles and of course the grout. This type of sealer will enrich/darken/enhance the tiles and grout too. It'll give the tiles...

Hardie and all other CBU's are set into thinset mortar spread with a 1/4x1/4x1/4 notched trowel, then, fastened, taped etc. Floors are not normally waterproofed, it's almost impossible to waterproof...

Hi guys,

Although the specs say it can be used for ceramic over ceramic, mastics are a bad choice for any floor installation. You should use thinset mortar which only comes in a bag, it's powder....

I think the main cause of water hammer is air-cushion lost within the pipe. You need to drain and re-establish an air cushion. Lots of info available on how to do that. Here's one;...

Hi Pilot,

I don't know about Dur-a-lock, but Durock and all CBU's require a leveling/supporting bed of thin set mortar under them. It's not to glue (hold) the board to the floor, it's to support...

I wouldn't replace the grout unless it was too low or had some other defect. First try cleaning with a heavy duty acidic tile and grout cleaner, there are many. If that looks good to you, apply a ...

2x6 lumber measures 1.5" x 5.5" as you already know. If yours are old, they might measure the full stated size.

The charts don't tell me what the deflection is for any specific span. Charts...

OH? What material science are you talking about?

If a span has a deflection of let's say I-270, any portion of the same span will be 270. So let's say the actual deflection is .5" for the 10'...

Harum,

You're correct that CBU's do not add any structural strength, just a tile-friendly substrate.

It doesn't matter that the tiles are partially over a beam. The deflection in 11-12 ft....

Sorry Kitman, but a complete tear out is in your future. I can't tell what he did wrong, but obviously the job is trash.

If you'll give us details of what was done, how and with what, we can help...

I would only use rapid setting thinset for a small repair or small area to complete in one day instead of two.

You can use a cheap unmodified under your CBU. How big an area is this and how...

Someone doesn't understand how to build showers. You can't tile directly over the shower pan, that gray stuff that has Schonox & Balterra on it.

Don't know what's going on, I'd have to be...

Cutback adhesive from that era has a high probability of containing asbestos, but it needs to be tested.

I certainly would not allow children to walk or play on a floor like that. Allowing...

I've never heard of Schonox, I see it's a division of Akzo Noble. But Schonox is a brand of many products you didn't say which one you're trying.

Jaz

Well, that doesn't answer the question, but you obviously know it has to go below the weep holes in the drain which are probably a good 2" below the strainer.

You can't repair a damaged pan...

How have you tested the pan for leaks? Have you used an inflatable plug? Was it placed into the pipe far enough so it was below the weep holes?

As you said, grout, caulk and tile has nothing...

Anything's possible, but the subfloor should not be just 1/2". How old is this house? Where is it located? You may want to drill a small hole and measure to thickness and whether there's more than...

What width does the sheet vinyl you want come in? Many are 12', the heavy duty ones come only 6' wide.

So, if 12' wide, you buy 12x18" or 24 sq. yds.
If it's 6' wide 6x29'3" plus 2 pattern...

Peel & Stick mosaics? Yikes. Are you sure you didn't see the Bondera stuff that sticks to the wall and then you stick the tiles to it?

I don't think much of either method BTW. Heat or sudden...

You're welcome... anytime! ;)

Jaz

I wasn't able to find step by step here, so go to this other forum for instructions on how it's done. Come back with Q's if any. How to build a shower - Building a shower pan with pre-sloped mortar...

The video only shows the top pitch of the deck mud, they don't show the pre-slope, the one under the shower pan membrane. What are your plans? Did you know you're supposed to have a pre-slope? ...

You're right about the nice people at the big box stores, they're very nice, but it's difficult to find anyone that knows more than the minimum. In 20 years I've only found one person in the...

It's interesting that my replies to your post #7 have magically disappeared. The same thing happened a few years ago when a plumber on this forum with over 50,000 posts didn't even know that the...

Gee guys, terrible advice all. Sorry, but it's my experience that plumbers have no clue how to build a shower, and that's a fact!

Jaz

Bubblechaser,

Don't even think about using any mastic in a shower, especially the floor. You will be removing the floor within a short time.

Use only real thinset mortar which only comes in...

Can you direct me to the UGL Drylok product that can be used for basement floors? I don't know of one for that purpose.

UGL - DRYLOK® Masonry - Masonry Waterproofer
Jaz

Sounds like joypulv misunderstood, or maybe I did. But as I understand you I think you're talking about the sink/bullnose joint. Since it needs attention, you should use caulk, not grout. Grout...

I got the impression that smakelijk owns the condo and why he asked how much, or is asking for the owner. I also bet his upstairs occupant is aware of the leak.

It's impossible to know how much...

The size of the tiles has nothing to do will whether it's going to stick or fall off. The area the adhesive covers is directly increased in exact proportion as the tile size increases. So, a large...

Hi,

Hi,



That is not true. You can safely install Hardie and then ceramic tiles over 3/4" ply or OSB when the joists are 16" and 19.2" o.c. Actually Hardie says 5/8" is all that's...

Tell us more about these 4x4 tiles. Are they porcelain tiles or basic ceramic 4 1/4 x 4 1/4" like those sometimes used on walls? Do you have names or other info?

Jaz

Hi Matt,

Make sure the wall is clean and go. Use a modified thinset mortar, it has the additives in it already. Just add water.

Jaz

My answer is probably too late for Mitch, but it may help others.

I would leave the board and install/apply a surface membrane instead. It's a much better method of controlling vapor and at the...

No.

Jaz

Hi Joe, welcome,

Yea 1/2" is a lot, how large is the floor? You did a mud job? How thick is it? Is it a room or a shower floor or? How large is the area that is low in diameter?

Thin set...

Their labor is not free, they just don't show it in your bill. All they have to do is add as little as .50 a sq. ft. to the carpet. Or discount it less than they otherwise would.

BTW, $3.00...

Of course. What type of flooring will you be installing?

Jaz

Sorry, that link didn't work right. Just Google "silicone remover", Dap is one brand.

Hi all,

There are several silicone removers out there. It's a gel consistency bottle cap has a brush. Work pretty good, still takes time. Here's one by Dap. ...

I still don't know what he mixed. Portland cement is one of the proper components of deck mud, the other is sand. It is supposed to be mixed very dry. You should be able to grab a handful and make...

The word "mud" is miss used all the time. Can you give some info? Was it a bagged item or did he blend the ingredients? How thick is it? Is this the mud under or over the membrane?

If his mud...

Hey Paisano,

Before we get to the adhesive can you tell us what the subfloor consists of and how you installed the Hardie.

! Stone tiles require a much stiffer subfloor system than porcelain...

You're right, that old floor was installed all wrong, never had a chance.

Your new floor will be higher than the hardwood. The amount varies according to the specific tile and method you select. ...

Hi Jean,

It's a slab right? Not granite tiles. As Chuck said you're fine if a slab. Tiles are a different matter.

Jaz

Hi David,

There's more than one right way to set tiles on a floor.

You say you're down to the subfloor, but forgot to say what it is. It would also help to double check if the joists system...

Wrap the dish with a rag then tap tap with a hammer. Then small putty knife or chisel. You'll discover the dish is not covering a tile, but takes the place of one with the flange overlapping the...