[logan176]

My dad bought me a tube of Liquid Nails Marble and Granite Adhesive. Since I'm putting down two marble door saddles tomorrow, I just read the tube and it says that I shouldn't use it for flooring. Can I use premixed mortar or do I need to buy a bag of the stuff I mix myself for such a small job?

[JazMan]

Never use pre-mixed anything to install or grout floors. Get a bag of thin set mortar which comes only in a bag. For marble you'll want white modified thin set. What type of substrate are you going over? What color is the threshold?

Jaz

[21boat]

Is this a door threshold which I presume it is.
Is the floor wood underneath?

How about this instead of mixing up materials.

Recommended For:
Bonding building materials (concrete, lumber, etc.) to sub floors, tile board, treated lumber, cabinets, foam board, counter tops, granite, marble, drywall, ceramics, mirrors, plastic, vinyl, 1/8" MDF paneling, brick veneers, plywood and wafer board.

It just mentions not for ceiling tile but covers marble. A lot easier to use quick.

Liquid Nails® - Polyurethane Construction Adhesive (low-VOC) (LN-950)

Personally I have had no problem using a caulk adhesive for thresholds period.

The reason Jazz man ask you what color it is is because of bleed through with a wet product. Never had that problem with caulk.

Personally I feel that warning part is there because of the big word marble on it giving the "dummy" home owner the thought of, Oh I can use this to put my bathroom marble floor in.

I usually use http://www.dap.com/product_details.aspx?product_id=2
Can't begin to tell you how many very old metal door thresholds I beat out with a chisel because of old ordinary caulk holding it in. Been walking across my marbel threshold for 20+ years with reg caulk.

Signed 21 Boat

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[logan176]

The marble I have is for a bathroom door threshold. I will be putting grout down between the marble threshold and the bathroom tile. On the other sideof the marble is my hallway where I am installing hardwood flooring in a few weeks. The marble is a whitish grey with veins of darker gray going through it. Underneath the threshold is hardibacker on top of a wooden subfloor. I was thinking of pulling up the hardibacker and putting down a strip of Durock like I have underneath the rest of the tiling job. Keeping everything in mind, I would like to make sure that the grout I install does not start cracking where it meets the saddle.

So just to clarify... 21boat, you're saying that DAP adhesive caulk has never failed you in the past? The caulk doesn't leave the marble threshold just flexible enough that if people step on it, it may start cracking the grout on the other side?

[21boat]

In the older days when liquid nail came out that is what I used for the marble thresholds if it butts to grout. Ive used marble for basic transitions from vinyl to carpet. Liquid nail figured a way to develop newer 'Improved" for different applications which i wonder about that... Your first tube says marble on it, but "Not for flooring" The one I posted says. marble etc and "Not for ceiling tile" Mentioned nothing about flooring crazy huh. If the liquid nail moves so does the floor. See the point here. Liquid nail is just that, like its nailed. I would use the liquid nail I posted. If the threshold moves it can crack. If its set in thinnest and the surface below that moves then the grout line is cracked and the threshold. So liquid nail it and it will be only as good as the subsraight. Even beads smush well. Watch too much on the edges.

I know jazz man will be not happy with this advice I have given, the threshold is not the width of a tile basically. And full spread is what's needed for the reg floor because of width and hollow ness that can be under a set tile. The threshold is thicker than basic tile and skinner also.

So if it were me I would liquid nail it instead of mixing thinnest up and being concerned about bleed through.

The logic here is we use liquid nail on joist for sub floor so it doesn't squeak and move.

Signed 21 Boat

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