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Fundo Ligno installation with Fundo Click and Seal Drain DN50

wedi Fundo Ligno is designed to provide for a low profile base thickness of only 20 mm. This allows for a fast and flush installation into a subfloor assembly without cutting into floor joists. The system is designed to work without a hob. Enjoy the ease of installation without creating a structural hazard because you maintain the structural subfloor boards installed between floor joists under the wedi Fundo Ligno. Because barrier free showers may be exposed to heavy point loads (e.g. wheel chair), you can confidently rely on the structural strength of the wedi base and subfloor as well as the wedi Fundo‘s traditional strong cement based surface for ideal tile bond using any suitable cement based tile adhesives or grouts. As applied to all wedi Fundo Shower Systems, wedi Fundo Ligno is designed to interlock and work with wedi Building Boards, wedi 610 adhesive sealant, wedi Fasteners, wedi Seats and Benches, wedi Niches and many more accessories, that truly complete your shower installation and waterproofing system. 

The assembly steps are explained below using the example of a vertical DN50 drain.

Cut out a 130 – 165 mm diameter hole out of a 20 mm plywood base around the pipe‘s center to allow for the wedi drain to be inserted into the subloor while the cut our are must remain free of deflection. 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 shows no seams where close to the cut out for the wedi Fundo Ligno drain. Cut the Pipe 15 mm below the top of the substrate.
Next, install the Fundo Click and Seal drain unit. Drain components are delivered inserted inside the Drain Body. Please take the parts out and use step by step following our manual here.
Apply the wedi provided safe Lubricant to the black rubber ring inside the wedi Drain Body
Insert the Drain Body snugly into the receiving mechanism of the Drain Unit on the underside of the Fundo base.
Once inserted, turn the Drain Body clockwise until it “clicks” into final position and you will see the imprinted arrow on drain unit aligning at the base’s click mechanism. This will require no more than a quarter turn. Ensure a tight connection by lightly pulling and pushing on the Drain Body. The Fundo base and its Drain Unit is now ready for installation. Should you want to remove the Drain Body at any time, this can be done by pushing the snap mechanism’s plastic flap inwards using a flat headed screwdriver and while unscrewing the Drain Body to the left at the same time.
On the top side of the drain you can also verify the drain unit has successfully connected when the single hash marks are centered between the double hash marks.
Trowel the tile adhesive and comb through with a 10 × 10 mm notch trowel. Channels pointing to the entrance.
Trowel the tile adhesive on the rear side of the Fundo again using a 10 × 10 mm notch trowel. There are different ways to ensure good bond of the wedi base to the subfloor. Applying tile adhesive on both, wedi base and subfloor, is a best practice recommended to achieve full surface coverage adhesion.
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). Do NOT step on the drain module to push/connect to drain body or thinset. Ensure there is 100 % thinset supporting the drain channel area over a completely flat subfloor
Apply wedi provided safe Lubricant to the Rubber Sealing Gasket and insert the Rubber Sealing Gasket between the wedi Drain Unit‘s interior and the outside of the DN50 waste pipe in the floor. Push the Rubber Sealing Gasket down along the waste pipe until it is stopped by the Drain Unit‘s lower interior flange.
Apply wedi provided safe Lubricant to the rubber part of the Compression Spacer. With the rubberized part pointing up now insert the Compression Spacer in between Drain Unit and waste pipe and on top of the Sealing Gasket. The Compression Spacer will push the Rubber Sealing Gasket down into its resting position.
Insert the Locking Nut with notched side up into the threaded part of the Drain Unit opening and screw down until Locking Nut top is flush with top edge of Drain Unit‘s threaded part. Important: Turn Locking Nut to LEFT to insert and screw into flush position.
Insert Strainer Key into Locking Nut at notch connections and with Strainer Key printed side up. The Strainer Key is used as a tool to tighten the compression seal of the Drain Unit, but remains in place later to serve as a hair catcher to protect the drain and make maintenance and cleaning easy
Insert a flat headed screwdriver into Strainer Key slit and turn LEFT to tighten the compression seal. Achieve a hand-tight fit and do not over-tighten.
Set up a continuous 10 mm bead of wedi 610 adhesive 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.
wedi Niches are installed in a cut out in the wedi wall and attached with it‘s flange right into the center of 450 mm studs. wedi 610 adhesive sealant is set along the connection of wall to niche.
2 Fasteners each side of the niche are set to create a flush transition to the wall boards. Another 10 mm bead of wedi 610 adhesive sealant is spread over fasteners and seams.
Use the wedi building boards in 6 mm or larger thickness in lieu of cement board. wedi Building Board would be installed over your structural subfloor and overlap and seal into the Ligno channel with the wedi 610 Sealant. 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 610 adhesive sealant, and are covered with an external 20 mm bead of wedi 610 adhesive sealant spread flat.

For a fully waterproofed installation please install wedi sealing gaskets for mixing valve and shower head cut outs.
You can now insert the drain cover unit consisting of a stainless steel frame and the stainless steel cover itself. The drain cover unit fits in loosely and the drain installation is complete.