Discuss LVT rise every few years over CH pipe in sub floor. Martin. C in the UK Tiling Forum | Tile Advice Forum area at TilersForums.com

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Tiles laid over SLC . First time it happened put down to Xmas disaster, causing turkey fat to soak into concrete. Detergented, but repeat. It appeared that SLC expands locally, loses bond, breaks and arches up. As only two tiles are affected, I can lift, clear broken corners of SLC and pack gap to allow expansion. What would be recommendation-The SLC is about 10mm thick. Ply piece, fitted in loosely, bonded to concrete and tile with acrylic high temp adhesive? Pipe run only affects tiles in limited small areas. This must happen fairly often, but nobody owns up, and two adhesive companies had not heard of prob.!
 

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