Fundo Primo installation
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Fundo Primo installation

Floor-level shower systems

The wedi Fundo Primo Shower System features a square drain cover point drainage solution for fast and safe renovation and new construction installations. Primo is internally waterproof due to its wedi XPS foam's closed cell structure and naturally protect against mold or mildew like every wedi XPS foam based product. It is fast and clean to cut to fit custom designs while the level of prefabrication reduces installation time significantly. The shower floor units feature a strong and pre-sloped surface which can be tiled over immediately whether you choose mosaic size or large format tile. Drain unit and drain cover set is always included with each Primo shower floor unit while further optional drain cover designs are available. Pre-sloped extension panels are available so that virtually no limit exists for making any size or shape for custom shower designs happen.

The added values offered by Fundo Primo come in form of many more performance advantages. Naturally, Fundo Primo is insulating keeping surfaces warmer. Especially when compared to traditional mortar bed installations or other currently known methods for building showers such as those including use of sheet – or liquid waterproofing membranes used in an attempt to manage water exposure – wedi Fundo Primo's simplicity and high performance shows. The installation combines many manual and separate installation steps and materials usually needed into very few. Fundo Primo adds speed, safety and consistency to your installation: Measure, possibly cut, thinset to subfloor, connect drain – done. The most unique  advantage, however, is the complete and natural core waterproofness of the wedi product and it’s completeness and range of components that will form an entire assembly system with Fundo Primo engineered to fit and last. A true system with full warranty coverage.

Step 1 Step 1

Cut the 2” pipe flush (or max. 1/8” above) to the floor construction. Make sure that the cut out fits to the Fundo panel drain. Cut out a 5” diameter hole around the 2” pipe to allow the wedi drain to be inserted
into the subfloor while the cut out area must remain free of deflection. The drain and trap have to be sturdily fastened to the sub floor.
Step 2 Step 2 Assemble the drain unit following the instruction drawing.
Step 3 Step 3 Set up a continuous 1/4” bead of wedi sealant along the top side of the wedi Fundos’ valve groove profile.










Step 4 Step 4 Drop the drain body firmly into the sealant.
Step 5 Step 5 Turn the Fundo base upside down and apply the rubber and the fiber gasket.
Step 6 Step 6 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.
Step 7 Step 7 Skim coat the thinset ANSI 118.4 and comb through with a 1/4” x 1/4” notched trowel. Channels pointing to the entrance.
Step 8 Step 8 Trowel the thinset on the rear side of the Fundo again using a 1/4” x 1/4” notched trowel.
Step 9 Step 9 Press the Fundo firmly into the thinset bed, ensuring that the installation is level and void free. Apply some weight equally and for at least 30 minutes (thinset bags or tile boxes).
Step 10 Step 10 Set up the rubber caulking gasket (with the bevelled side up) around the 2” pipe in the subfloor. The rubber gasket must be flush with the upper end of the 2” ABS or PVC pipe. Do Not use any Lubricants.
Step 11 Step 11 Tighten (squeeze) the rubber caulking gasket firmly with the caulking nut (use a flat headed screwdriver) and finally insert the plastic frame and strainer on top (without adhesive). The frame and strainer will be held in a grout joint only once tiling commences.
Step 12 Step 12 Set up a continuous 1/2” bead of wedi Joint Sealant along the pans channel on the outer perimeter and only in areas where you can immediately install a building panel into the fresh sealant.
Step 13 Step 13 Push the wedi panel 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 panels directly to the studs starting 1 ft above the base and at a rate of 1 fastener per 1ft. One extra fastener is set into the seam to the next panel to create a flush transition.
Step 14 Step 14 Apply continuous 1/2” beads of sealant between all connections of panels 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 1/2” bead of sealant and spread flat. The seams should be covered 1” on either side of seam. All fastener/washers are covered with sealant stretching 1” over the washer edges.
Step 15 Step 15 wedi Niches are installed in a cut out in the wedi wall and attached with it's flange right into the center of 16 o.c. studs. wedi Joint Sealant is set along the connection of wall to niche.
Step 16 Step 16 2 Fasteners each side of the niche are set to create a flush transition to the wall panels. Another 1/2” bead of wedi Joint Seal ant is spread over fasteners and seams.
Step 17 Step 17 A continuous 1/2” bead of sealant is set into the channel and along the vertical curb notch part. A circle of 1/2” sealant bead is set against the wall panels where the curb attaches. A 1/2” x 1/2” bed of thinset mortar is applied to the subfloor and a skim coat on the bottom surface of the curb as a best practice. The tightly fitting curb is pressed into the connection area.
Step 18 Step 18

Weight is applied on and against the curb (from outside) and another 1/2” bead of sealant is applied over all curb seams and spread flat. The seams must be covered 1” either side of a seam.

Curb connection notches must be cut to fit select Primo bases with perimeter thickness higher than 1 1/2”.

wedi Fundo Primo – Custom shower

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At a glance

Technical handbook 3.92 MB) Data sheet Fundo Primo 2.15 MB Data sheet Joint sealant 0.14 MB Technical Approval (english) 0.55 MB Technical Approval (french) 0.20 MB Assembly Instruction 0.74 MB

wedi system components

wedi Building Panels wedi Fundo Primo wedi Joint Sealant​​​​​​​ wedi curbs

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