Expansion joint perpendicular to the third bond

  • Erstellt am 2022-04-07 09:41:24

Dogger.

2022-04-07 09:41:24
  • #1
Hello, I am looking for a solution to a tile problem,

I want to lay new tiles (slate) myself in my house (30 years old).
The tiles are 40x60 cm and should decorate the floor in a third-pattern bond.
Now, there are 3 expansion joints in the old tiles in the middle of the room.
The room has a U-shape. The old tiles should be removed down to the screed.
The room has underfloor heating.

Two joints are therefore perpendicular to the tile pattern.
Problem: straight expansion joint perpendicular to the third-pattern bond of the tiles.

My idea is to stick a thin sealing membrane with silicone onto the screed over the expansion joints.
I would slightly grind (mill) the screed by 1-2 mm in the area of the covered expansion joint to avoid an elevation.
After I have then laid the tiles on the sealing membrane with C2FT S1, I cut through the membrane again along the joints between the tiles near the expansion joint.

My hope is that this way I can transfer the straight expansion joint onto the zigzag (third-pattern bond) expansion joint of the tiles.
The tiles that span the expansion joint in the screed would thus lie "floating" on a thin silicone bed.

What speaks against this approach apart from the shear forces in the expansion joint which cannot be well absorbed in the tile joint?
Are there other options besides covering the entire floor with expensive uncoupling mats?

I thank you for any constructive criticism.
 

11ant

2022-04-07 10:05:26
  • #2
I am always amazed by the questioners who omit the "Yell 4 Fachmann," but I am happy to do it for you and do not buy ERNSTL, instead I invite to the discussion :-)
 

RotorMotor

2022-04-07 10:12:45
  • #3
The floating silicone construction does not sound very durable, if it even holds at all. I would cut the tiles at that spot to realign the screed joint in the tiles. Why don't you draw the room and the joints?
 

Dogger.

2022-04-07 10:35:12
  • #4
The red lines are the joints. The blue bar is a wall around which tiling is done.
 

Tolentino

2022-04-07 10:50:16
  • #5
Because the wall changes the proportions, I would tile with the joint (i.e. parallel) anyway, not across. Otherwise, the respective room would be stretched even further in length. Then you don't have that problem. Otherwise, as far as I know, there are special systems for that. Check out Schlüter...
 

Dogger.

2022-04-07 10:54:58
  • #6
@ Tolentino

There are three expansion joints.
Which one do you mean?

edit:
I want to lay the tiles parallel to the central wall.
So the longer side of the tile from left to right.
The room should appear longer from left to right.
 

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