This detail shows 2 cm (3/4 in.) thick dimension stone adhered to cementitious backer units (CBU) over a wood substrate with a cementitious bond coat. The CBU underlayment is adhered and mechanically fastened to the plywood subfloor. Expansion joints in the floor assembly must be provided at locations shown by the design professional. This detail is based on Natural Stone Institute’s interior stone paving detail, Thin Bed Mortar Over Typical Cementitious Backer Unit. Details that show different or modified concepts or methods can be of equal validity and should not be excluded from consideration. This detail shall not be used for construction without the approval and signature of a licensed design professional. The person using this detail shall be responsible for its complete design and proper application.

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