Tile on cork liner

Name: Gary
Posted: Mon, Apr 5, 2010 at 9:44 am MST
I have a second floor condo that the tile on the floor is starting to raise in an area approx. 20 sq ft. I have not attempted to remove to repair yet. A nieghbor showed me tiles removed from another condo and they have a 1/16" cork barrier adhered to the back side. They did not have any type of glue or thin set on the cork where it meets the floor.

My questions are. Can I repair just the area of loose tiles or should I expand the repair to include tiles that are not loose? What kind of thin set or mastic should I use between the cork and conrete floor and between the cork and ceramic tile?
Name: Eric G
Posted: Tue, Apr 6, 2010 at 9:27 am MST
Reply: 1
(I have a second floor condo) Cork is usually used as sound control, it is usually 1/4" thick. You must remove the loose tiles to see what the problem is. Ask your self why this area is loose? Such as expansion, lack of adhesive. You can repair the area but it will probably be a temporary fix. Cork is usually installed with a flooring adhesive, although I've seen people use mastic. Not good. Most job failures I have seen in condos are due to cork related problems. Some adhesives dry out others are not intended to use with cork at all, installers use too little or too much. Still poor workmanship and lack of knowledge of proper materials are widespread. I haven't used cork in five or six years and will not guarantee a job if the builder or homeowner insist on using it. To repair your area I would first check your condo's bylaws to see what sound control materials are required. 1/16th still doesn't seem right, but ok. Use the manufacturer's recommended adhesive (not the big box salesman's recommendations) then install new tile with a quality modified thinset.
Name: Gary
Posted: Thu, Apr 8, 2010 at 5:25 am MST
Reply: 2
Thanks Eric. I have pulled up the loose tiles and you are right 1/16" cork is incorrect it is actually 1/8" and it looks like the reason it is coming up is due to to much adhesive being used. I appreciate your help. Thanks again!

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