Questions and Answers for Schluter Kerdi 215 sq. ft. 39 in. W x 65 ft. L x 8 mm T Waterproofing Membrane Underlayment for Tile

A:  It is very difficult to answer a question like this without more details. I would suggest that you call Schluter Systems’ customer support line at 1-800-472-4588 to discuss a solution in greater detail.

A:  The KERDI can be installed with the Schluter branded thinset products, as well as other thinset products. Here is a copy of the Shower System Handbook. This will go over acceptable thinset requirements. Link - https://sccpublic.s3-external-1.amazonaws.com/sys-master/images/h1a/h33/9377060421662/Shower%20System%20Installation%20Handbook.pdf

A:  You really are better off following recommendations, use the tape.

A:  It is very difficult to answer a question like this without more details. I would suggest that you call Schluter Systems’ customer support line at 1-800-472-4588 to discuss a solution in greater detail.

A:  With a utility knife. Then install Kerti vertically with all-set thin set.

A:  It is very difficult to answer a question like this without more details. I would suggest that you call Schluter Systems’ customer support line at 1-800-472-4588 to discuss a solution in greater detail.

A:  It is very difficult to answer a question like this without more details. I would suggest that you call Schluter Systems’ customer support line at 1-800-472-4588 to discuss a solution in greater detail.

A:  It is very difficult to answer a question like this without more details. I would suggest that you call Schluter Systems’ customer support line at 1-800-472-4588 to discuss a solution it greater detail.

A:  1/16 of an inch

A:  It depends on the trowel you use for the mortar. 

A:  Honestly I do not know. Our son did our bathrooms over and in ordering the products, all of the product info only stated for bathroom/shower areas. I suggest contacting Kerdi directly to check.

A:  Tile should stick quite well to concrete. If tile won’t stick to your concrete then Kerdi won’t either. Iti uses the same thinset as an adhesive that you used for your tile. Check your concrete to see if it is contaminated with oil or wax. If so you’ll need to remove it with a TSP solution before amything will stick. Try just putting a layer of thinset on the concrete in a small area. If it adheres your tile should stick. You could have an issue with uneven concrete and/or insufficient thinset thickness. See how uneven your concrete is with a straight edge. You might need to use leveller to even it out. Another idea: Install a tile using your normal method, then pull it up with a flatbar. The lines on the thinset should be “mushed down” everywhere. If not then you need to use a trowel with bigger notches or apply more pressure after placing the tile. Good luck!

A:  It is very difficult to answer a question like this without more details. I would suggest that you call Schluter Systems’ customer support line at 1-800-472-4588 to discuss a solution it greater detail.

A:  No. This is for waterproofing, not decoupling. To decouple you need to use Schluter DITRA. Flexbond thin set is not flexible enough (it is more "flexible" than other thin set, but it is still mortar; it has a chemistry that makes it less prone to cracking (aka "flexible") but it is not flexible enough to decouple. To decouple you need a product that lets the top surface and the bottom surface move independently (not mortar of any kind). Ditra is the product to use for decoupling. I used it two years ago and my floor tile/grout is crack free. Suggest watching Schluter videos on YouTube - they have an entire channel that is very helpful.