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Identifying the Number of Plies Rolls come in standard and metric sizes:  Standard- 36″         Metric 39 3/8″ 2-ply standard:   17-inch ply exposure 2-ply metric:       18 9/16-inch ply exposure 3-ply standard:   11 1/4-inch ply exposure 3-ply metric:       12 7/16-inch ply exposure 4-ply standard:     8 1/2-inch ply exposure 4-ply metric:          9 5/16-inch ply exposure   INSPECTION CONCERNS Design …

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Spalling is freeze damage. Clay tile is absorbent. If tile absorbs water from precipitation and then the temperature falls below freezing, Water expanding as it turns to ice can cause flakes to separate from the tile surface. This process is called “spalling”.

Spalling of clay tile is basically freeze damage. Clay tile is absorbent. If tile absorbs water from precipitation and then the temperature falls below freezing, Water expanding as it turns to ice can cause flakes to separate from the tile surface. This process is called “spalling”.