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Unread 04-22-2021, 08:12 PM   #1
miss piggy
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we currently have a porcelain tile floor in our den. Some of the tiles have cracks, some or I mean all of them sound hollow. I know that the cracks are coming from the cracked cement slab below. The hollow tiles are I suppose, from not enough backing when installed. I know it would be very easy to remove them as they are not connected to the slab at all.When we get ready to put new tile on the floor, I know that some type of crack supression is required. How can we make sure that this new flooring does not crack? Regards, Patricia Kuehne
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Unread 04-23-2021, 07:41 AM   #2
Tool Guy - Kg
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If the slab cracks aren’t structural, it’s as simple as using something like NobleSeal CIS under the tiles, bonded directly to the slab. You can use their own adhesive (suuuuuuuuper sticky), or you can use thinset mortar to install the membrane to the slab. Then, you use best practices of installing the tile (like cleaning the tile, proper troweling, burning a coat of mortar onto the tile & substrate before combing the mortar, & using the correct sized notched trowel) over the membrane with a quality mortar.

Most often, removing the tiles leaves a rough mess of old, hard mortar. I will generally use a grinder on the floor with a diamond cup grinding wheel to quickly remove all the mortar to leave a clean slab upon which to install the membrane.

But if the cracks are structural (cracks with vertical displacement from either side of crack, greater than 1/4” in width, or cracks with variable width over the length of crack), then no crack isolation membrane can be expected to give proper results.

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