Constructions Standards Checklists

TILE SHOWER STALL – LIQUID MEMBRANE APPROACH

SHOWERS AND TUBS  A. All shower units must have a continuous, integral tiling flange that is a minimum of 1" high. No cracked or damaged flanges are permitted.  B. 2x6 blocking is installed at perimeter of shower at flange height - bottom edge of blocking should be approximately 1" below top of tiling flange.  C. 4" butyl based self-adhered flashing is used to seal the pan flange to the 2x6 blocking - Use "7 step approach" with 6" pieces of flashing in front and back corners and individual pieces of flashing between corners.  D. Shower backerboard is installed with a factory

edge down towards shower unit and held just above top of tiling flange -backerboard should extend beyond surround area so that the joint between backer board and drywall does not align with edge of tile.  E. Seal all corners, joints, and any fasteners that break the surface with C920 Class 25 sealant.  F. Apply liquid applied waterproof membrane to all seams. Follow manufacturer's installation specifcations - two coats are required to achieve required membrane thickness.  G. Leave a minimum 1/8" gap between tile and shower unit for sealant.  H. Pan weeps were open and clear of grout and sealant.  I. Do not grout the corners or transition to the shower pan – seal using C920 Class 25 sealant.  J. Any shower seats shall have a continuous waterproofng membrane over them.

CONSTRUCTION STANDARDS CHECKLISTS | Showers & Tubs | 47