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Homeowners and builders increasingly favor shower spaces which can function without a curb or would not require any build up over existing floor areas resulting in a step up into the shower. One important reason for this trend is: easier and safer access to the shower for older and/ or physically disabled persons. While this trend offers great design and business opportunities it also presents technical challenges which cannot be overcome by many conventional shower installation methods or products. Main challenges are safe recessing of a sloped shower base into an existing structural floor for a flush transition and the extension of waterproofing from shower area into surrounding floor areas no longer protected by a curb keeping water inside the shower area. To address all challenges for tile professionals, wedi engineered Fundo Ligno, a sloped shower base ¾ inches thin at its perimeter and available in various sizes. Ligno can be field modified. The installation within a ¾” plywood structure requires no cutting into joists. Loadbearing plywood is simply reinstalled between floor joists and over 2 x 6 or 2 x 4 blocking then attached to the joists. This guarantees a full support and protection of the tiled surface. The wedi typical strong cement based, reinforced surface is pre-sloped, directly tileable with large or small format tile. Ligno interlocks with wedi Building Board used as waterproof backer board on walls as well as on the surrounding floor. Optionally, wedi‘s Subliner Dry Sheet Waterproofing membrane can be used. Both options offer a complete and professional system installation.
Cut 20 mm plywood base out fitting the space of wedi Fundo Ligno. Safely install blocking along floor joists appr. 20 mm below top of floor joists. Adjust for thinset thickness under wedi Fundo Ligno base and / or the flooring underlayment installation adjacent to shower area to create a flush transition for waterproofing and tile between floor and shower area. Re-install 20 mm plywood over blocking to have the Plywood flush with the floor joists and fill with furring strips on top of floor joists in case the blocking / joist that carry the Plywood under wedi base is installed higher than 20 mm deep from top of floor joists. Make sure the entire perimeter of the wedi Fundo Ligno base is supported by floor joists or adequate blocking. Make sure the plywood base s hows no seams where close to the cut out for the wedi Fundo Ligno drain. The DN50 pipe is cut square and even at minimum 56 mm below the recessed subfloor top surface. The pipe adapter is cut even at 16 mm below the recessed subfloor top surface.
Connect the wedi adapter to the floor pipe using the appropriate PVC cement glue. Make sure that the Pipe Adapter is cut even and square 16 mm below the recessed subfloor top surface. Make sure the round cut out in the floor allows for the full recess of the wedi drain body attached to the Fundo panel.
Assemble the drain unit following the instruction drawing.
Set up a continuous 5 mm bead of wedi Joint Sealant along the channel in wedi Fundo‘s drain flange receptor.
Drop the drain body firmly into the sealant.
Tighten the gaskets firmly to the bases‘ steel ring using the locking nut. Make sure the drain body is still safely received in the valve-bead of sealant.
Trowel the thinset and comb through with a 10 × 10 mm notched trowel. Channels pointing to the entrance.
Press the Fundo firmly into the thinset bed, ensuring that the installation is level and void free. Apply some weight equally and leave on surface and drain area to allow the thinset to initially cure without being disturbed (e.g. thinset bags).
Set up a continuous 10 mm bead of wedi Joint Sealant along the pans channel on the outer perimeter and only in areas where you can immediately install a Building Board into the fresh sealant.
Push the wedi board all the way into the channel of the shower base channel and its bead of sealant. Smooth out any pushed out sealant on inside seam using a putty knife. Fasten the boards directly to the studs starting 300 mm above the base and at a rate of 1 fastener per 300 mm. One extra fastener is set into the seam to the next board to create a flush transition.
Apply continuous 10 mm beads of sealant between all connections of boards and install with thigthly butted seams. Excess sealant must be spread flat with a putty knife. All seams and fastener heads in the assembly are covered with a secondary 10 mm bead of sealant and spread flat. The seams should be covered 25 mm on either side of seam. All fastener/washers are covered with sealant stretching 25 mm over the washer edges.
Apply a modified thinset across the wood or cement board floor surface and now apply wedi Subliner Dry Sheet waterproofing membrane overlapping into the Ligno base for 100 mm. Apply wedi‘s prefabricated outside or inside sealing tape corners and sealing tape as a flashing to the wedi wall board/Ligno and Subliner dry sheets as applicable. All seams and ends of the Subliner Dry sheets are covered with a 10 mm bead of wedi Joint Sealant and spread flat using a putty knife. Your shower is ready for tile once the thinset mortar has hardened! Alternatively to Subliner Dry sheet membrane system wedi Building Boards in 6 or 10 mm thickness can be used as the floor tile underlayment in lieu of cement board and Subliner waterproofing. wedi Building Board would be installed over plywood subfloor and overlap and seal into the Ligno channel. In such application the Ligno base must be raised to allow its channel to fully stick out from the recessed area so wedi floor Building Boards can be interlocked with its channel. All seams to wedi walls or Ligno base are sealed internally with wedi Joint Sealant, and are covered with an external 10 mm bead of wedi Joint Sealant spread flat. Your shower is ready for tiling once thinset under wedi Subliner Dry or wedi Building Boards on floor has cured.
Fundo Ligno Building Boards wedi Joint sealant