Tag Archives: Glass tile

Specifying Movement Joints and Sealants for Tile and Stone: Reviewing current industry standards and design options

Photo courtesy Florida Tile

When there is a tile or stone failure, a contributing factor is often the lack of properly installed movement joints. Just like concrete sidewalks and bridges, tile and stone need to have movement joints to control the anticipated movements within a structure. Tile and stone will expand and contract when it is subjected to heat/cold or moisture/dryness. It is critical for architects to properly specify the design, materials, and layouts of movement joints.

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Case Study: Shower failure

All photos courtesy Ceramic Tile and Stone Consultants

Whether it is a shower or an exterior deck or balcony, the waterproof membrane surface must be sloped to drain or away from the building. Shower pans or receptors are supposed to have a pre-sloped mortar bed installed over the base substrate before installing the waterproof membrane. The pre-slope needs to have a minimum slope of 6 per 305 mm (1/4 per 12 in.) and be flat within that plane with no more variation out of plane than 6 in 3049 mm (1/4 in. in 10 ft), or 2 in 305 mm (1/16 in 12 in.). Exterior decks and balconies should also have a pre-sloped surface to meet those standards before applying the waterproof membrane.

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