If ceramic tiles, porcelain, or stone coverings are installed on cement subfloors, it is highly recommended to install a crack isolation membrane to waterproof the floor coverings and protect them from the movement of the cement floor. What is a crack isolation membrane? A crack isolation membrane is a thin membrane that isolates ceramic tiles, porcelain, stone coverings from minor in-plane substrate cracking and provides floor covering waterproofing.
Q: The Florida home I just purchased has many cracks in the concrete slab, some of them 10 ft. Long and up to 1/8 in.
I’d like to install a tile floor over the slab, but I’m worried that the tile will crack. Do you have any advice? Bill Diaz, San Juan, PR A: Tom Meehan, a tile installer and owner of Cape Cod Tileworks in Harwich, Massachusetts, replies: Cracks in a concrete slab are a problem that I run into frequently. In some cases I’ve seen cracks that are almost 1/4 in. Wide, so 1/8-in.
Cracks are nothing out of the ordinary. Applying tile in these situations is really quite simple. Before I begin the process of tiling over a cracked slab, I prep the slab with a crack-isolation membrane.
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A product that I’ve had good luck with is NobleSeal CIS (The Noble Co.;; 800- 878-5788), a composite sheet membrane that is made from chlorinated polyethylene with woven polyester fabric laminated to both sides. The membrane, which is bonded to the slab with the same latex-modified thinset that I use for installing the tile, absorbs any additional movement in the concrete. And at only 0.8-mm thick, the membrane can be used under almost any tile floor. I cut the membrane to extend at least two tile widths on both sides of the crack. Next I spread thinset over the slab where I’ll be applying the membrane.
After the sheet membrane is laid down over the thinset, I use a 75-lb. Roller to flatten it and to squeeze out any air pockets. If I encounter a slab with a lot of cracks, I apply membrane over the entire floor.
It’s easy to put down, and it may save me time and money in the long run. Although I’ve had tremendous luck with this product and this method over the years, I always let my customers know that it is possible that this fix might not work. Cracks in some slabs may not be controllable because of the soils that are under the slab, and there is a chance that the slab was poured incorrectly. If I have any doubts about the strength or stability of the slab, I don’t proceed with the project without an engineer’s approval.
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Ditra Crack Isolation Membrane
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. RedGard® Waterproofing Membrane and Crack Prevention Membrane is a ready-to-use elastomeric membrane for both. Waterproofing Membrane that's ready-to-use for both commercial and residential tile and stone application. NAC Products manufacturers crack isolation, sound control and waterproof membranes to protect tile, stone, marble and other hard surface flooring. Professional Quality Tiling Products and Supplies from Pure Adhesion. Next Day Delivery on all Products for Tile Adhesives, Grouts, Sealers and Cleaners.
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How to install peel and stick crack isolation membrane. This is used on concrete slabs with cracks and potential lateral movement.
The membrane will reduce the likelihood of the new tile we are installing from cracking due to lateral movement in the concrete slab. The membrane does not protect tile from cracking from vertical movement in the substrate. In this installation we are installing large format tile 6' X 36' X 1/2' using medium bed mortar. The new membrane is also very helpful in masking off undulations in the substrate that can cause ledges in the edges of the tile.