Installation of a flush floor-shower

Flush-floor showers, in the past dedicated to bathrooms for disabled persons, are nowadays being used more and more in both old and new buildings. They are no longer seen as a pleasant luxury, but have almost become standard. Building owners want the floor tile covering to be laid in the shower area as well. In the past, this required the costly installation of a sloping screed with floor drainage. Today, prefabricated elements (extruded polystyrene with mineral coating on both sides, reinforced with fiberglass fabric) with integrated drainage considerably shorten the construction process. The design of a wide variety of shower areas can be realized with shower tray elements in various standard formats and, on request, with elements in any geometry.

Waterproofing

Simple & safe to the goal

Preliminary works

1. For the installation of the shower tray elements, a minimum depth of 43 mm under the upper side of the unfinished floor is required. The heights shown in photo 2 are required in the area of the water run-off and - if any -the horizontal wastewater pipe. Recess for the run-off: approx. 20 cm x 20 cm, for the water pipe: approx. 8 cm
2. The size of the recess (a x b) in the screed should be approx. 2 cm larger than the element in each direction. If necessary, the recess for the shower tray element is filled with the quick-setting screed mortar weber.plan 816.
Installation of run-off and wastewater pipe

1. The connection between the existing wastewater pipe and the water run-off outlet is done with a PVC pipe, wrapped with acoustic protection strip. Run-off and water pipe must be fixed prior to the screed application, if necessary. In this case, the upper side of run-off must lay approx. 50 mm under the upper side of the screed. The tray element can be used as a template for an accurate installation of the run-off.
2. Prior to the screed application, all adjacent building parts/walls should be separated from the floor construction with an insulation foam strip. In case of screed thickness over 43 mm (self-carrying screed) no bonding layer is required.
3. Apply a bondcoat of the quick-setting and flexible tile adhesive weber.xerm 853 F on the backside of the shower tray element, using a 10-mm notched trowel.
4. The shower tray element is installed in both terms of height and level. It must lay full-contact on the substrate.
5. Weights must be placed in the corners of the tray element for securing its final position without altering its height position. Existing cavities in the area of the floor run-off area or in the area of the drilled borehole in the concrete ceiling (in case of a vertical run-off) must be completely filled with the grouting mortar weber.rep 767 through the existing holes. The ceiling breakthrough is insulated in advance from the lower floor. Afterwards close these holes with the rubber drops.
6. The joint between the screed and the tray element is completely filled with the tile adhesive weber.xerm 853 F. If movements between the shower tray element and the screed are expected, a movement joint must be installed. Connection joints are to be waterproofed with the 2-comp. reactive waterproofing slurry weber.xerm 844 and the system-compliant sealing tape weber.tec 828 DB G or 150.
7. Afterwards the waterproofing works of the shower tray element and the walls can begin.
8. After drying of the waterproofing (approx. 4 hours, depending on room temperature) fix the tiles with weber.xerm 853 F. The insert element for the stainless steel rost weber.sys 833 ER is rotatable and movable; it can also be adjusted in the height in accordance with the tile thickness.