06.110.0614 Tile steam room assembly | Wood or metal studs, backer board walls, mud floor


This detail, based on TCNA method SR614, illustrates a tiled steam shower or steam room assembly with wood or metal stud framing and cement board walls and ceiling and a mortar bed floor. The ceiling slopes 2" per foot to prevent dripping of condensate. The bonded waterproof membrane must be continuous and must adequately limit vapor transmission. If bonded waterproof membrane has water vapor permeance greater than 0.5 perms and if steam shower is in continuous use, a secondary vapor retarder is required, which laps over the shower pan membrane. If steel studs are used, they must be 20 gaguge or heavier and spaced 16" o.c. maximum to minimize wall deflection. Shims may be required behind the backer board to account for thickness of the shower pan membrane, supports for grab bars and other accessories affixed to the studs, and to ensure the walls are flat. The floor comprises a pre-pitched mortar bed sloped 1/4" per foot to drain, shower pan membrane tied into the two-stage drain assembly, and a reinforced mortar bed. The tile is adhered with a bond coat of modified thinset mortar.

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