inma75
2016-09-03 15:47:22
- #1
Hello everyone.
Installation of a ceramic shower tray, 120x90cm, approx. 40kg heavy. In the end, the shower tray should be flush with the floor. On the right and front sides, there are walls respectively; on the left, there is an anhydrite screed including Styrofoam insulation (because of underfloor heating, which of course runs only outside the shower area), the height of this screed is about 6cm, after tiling approx. 7.2cm. The area at the back is about 40cm (160cm between both walls minus 120cm width of the tray) and must be "filled" with cement screed (since it is a wet area). This area is not problematic, as the cement screed will be just as high as the anhydrite screed (thus 6cm). More problematic is the area under the shower tray, which has a self-height of 3.5cm. For the substructure, there remain approx. 3.5cm. A cement screed with a thickness of 3.5cm alone would of course be problematic.
Two questions: 1.) Support the shower tray with 4 rows of aerated concrete blocks underneath (each 90cm, 10cm, 3.5cm) and fill the resulting gaps with cement screed; appropriate waiting time until everything has "settled"; in my opinion, due to the blocks, a stable substructure for the later embedding of the tray. (I do not think much of shower feet or Styrofoam or anything as a substructure). What do you think about that?
2.) When the substructure is dry, the tray is placed on top. What gives the tray its support? Its own weight, the silicone on the side walls. My question: Does this ceramic tray need to be additionally filled in the cavities underneath (see pictures) with leveling compound (Speis) or screed, or is this not necessary? In other forums, regarding this problem, it is said that for maintenance reasons, the tray must not be glued to the substrate with tile adhesive (which I do not intend to do either). Some line the underside of the tray with foil and then fill with leveling compound (fills the cavity effect, but no bonding).
I think the cavity under the tray is so shallow that it can remain as it is (i.e., unfilled) and I thus only fix the tray at the edge area with silicone on the floor. Silicone from below, silicone from the sides, own weight, the screed from the back (with separation tape between tray and screed), all this should provide sufficient fixation for the tray. What do you think about that?
PS: Sealing is clarified.
Regards!
Installation of a ceramic shower tray, 120x90cm, approx. 40kg heavy. In the end, the shower tray should be flush with the floor. On the right and front sides, there are walls respectively; on the left, there is an anhydrite screed including Styrofoam insulation (because of underfloor heating, which of course runs only outside the shower area), the height of this screed is about 6cm, after tiling approx. 7.2cm. The area at the back is about 40cm (160cm between both walls minus 120cm width of the tray) and must be "filled" with cement screed (since it is a wet area). This area is not problematic, as the cement screed will be just as high as the anhydrite screed (thus 6cm). More problematic is the area under the shower tray, which has a self-height of 3.5cm. For the substructure, there remain approx. 3.5cm. A cement screed with a thickness of 3.5cm alone would of course be problematic.
Two questions: 1.) Support the shower tray with 4 rows of aerated concrete blocks underneath (each 90cm, 10cm, 3.5cm) and fill the resulting gaps with cement screed; appropriate waiting time until everything has "settled"; in my opinion, due to the blocks, a stable substructure for the later embedding of the tray. (I do not think much of shower feet or Styrofoam or anything as a substructure). What do you think about that?
2.) When the substructure is dry, the tray is placed on top. What gives the tray its support? Its own weight, the silicone on the side walls. My question: Does this ceramic tray need to be additionally filled in the cavities underneath (see pictures) with leveling compound (Speis) or screed, or is this not necessary? In other forums, regarding this problem, it is said that for maintenance reasons, the tray must not be glued to the substrate with tile adhesive (which I do not intend to do either). Some line the underside of the tray with foil and then fill with leveling compound (fills the cavity effect, but no bonding).
I think the cavity under the tray is so shallow that it can remain as it is (i.e., unfilled) and I thus only fix the tray at the edge area with silicone on the floor. Silicone from below, silicone from the sides, own weight, the screed from the back (with separation tape between tray and screed), all this should provide sufficient fixation for the tray. What do you think about that?
PS: Sealing is clarified.
Regards!