Fundo Primo installation

Cut the DN80 or DN100 pipe 15 mm below the top of the substrate. Make sure that the cut out fits to the Fundo base‘s drain. Cut out a 130 – 165 mm diameter hole around the pipe‘s center to allow for the wedi drain to be inserted into the subfloor while the cut out area must remain free of deflection. The drain waste pipe and P-trap have to be safely affixed to and supported by the subfloor structure.

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.

Please connect the DN80 or DN100 Adapter around drain body.

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.

Apply the wedi provided safe Lubricant to the black rubber ring adapter.

Make sure that the Adapter alligns into your pipe Settings.

You can then push the Fundo Shower Base including the wedi Drain Unit into the adhesive bed firmly so that the entire Drain Body including adapter is sitting into the DN80 or DN100 Pipe.

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.

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.

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.

Attention: 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.