crack membrane

Old 03-27-03, 11:04 AM
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crack membrane

Am assisting a friend with a bath remodle. Just finished the demo of the previous ceramic tile. The sub floor is a concrete slab that looks in rather good shape. However, there does appear to be a "stress" fracture that winds its way across the floor from the exterior wall to the middle of the room. The crack is never wider then say 1/8 inch. My question is, what is the most effective and professional way to prep and control this crack before new ceramic tile is applied. I have heard about a rubber type membrane but was not sure if you need to prep the crack or if the membrane needs to just be over the crack or the entire working surface. Thanks everyone in advance for your help.
Old 03-29-03, 09:41 AM
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nobleseal cis will allow you to bridge the crack . it should be installed three time the size of the tile (ie12' x12" tile =3' sheet) Nobleseal is bonded to the slab with a thin set and the tile are bonded direct to the sheet. see

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