Outdoor tiles, which adhesive?

[goosen]

Then it's time for a new project. 100 square meters of outdoor decking to be covered with 60x60 tiles. The base is a construction of reinforced lightweight concrete in beam form (similar surface structure as lekablock). Attached is a picture.

Do you have experiences/tips on adhesive to use outdoors? It's quite a large area, so I'd appreciate suggestions that aren't the absolute most expensive

Another aspect is that the base absorbs a lot of moisture, are there adhesives that can be adapted for that type of material?

 

[Johan456]

Are you going to lay tiles on top of a deck? So, Gösta that on the wooden planks? That's what it looks like in the picture.

 

[goosen]

Are you going to lay tiles on top of a patio? Like Gösta it on the wooden boards? Looks like that in the picture.

There are no wooden boards in the picture? It is, as mentioned, a construction of lightweight concrete

 

[nino]

Since it might not be a completely common construction, I would call one of the larger suppliers and talk to their technical support.
You have, among other things, large format tiles, outdoors, and a lättbetong substrate...

You might not get the answers you want, but you definitely don't want to start chiseling away tiles because they have come loose.

 

[goosen]

Since it might not be a very common construction, I would call one of the larger suppliers and talk to their technical support.
You have large format tiles, outdoors, and lightweight concrete substrate...

You might not get the answers you want, but you definitely don't want to start chiseling away tiles because it loosened

Thanks for the response. I think I've managed to find good stuff from Schönox!

 

[Thomas_Blekinge]

Tell. I have tiles on a concrete terrace for 10 years but they are starting to come loose now, and moisture is seeping through. The company first laid a waterproof layer (some kind of sheet, blue) and then tiles with adhesive and grout. At the edge, water has seeped underneath which eventually caused the tiles to come loose. I seem to remember it was also a Schönox product. The company combed the adhesive across the small slope. I think water has also come through the grout lines (which are never waterproof) and accumulated under the tiles. I wonder if it is better not to comb the adhesive at all to prevent empty spaces. It should be noted that it faces south with extremely high temperatures in the summer.
There is now a risk that I have to redo everything.
Feel free to share your thoughts.

 

[goosen]

Tell me. I have tiles on a concrete patio for 10 years, but they are starting to loosen now, and moisture seeps through. The company first applied a waterproofing layer (some type of membrane, blue) and then laid tiles with adhesive and grout. At the edge, water has seeped underneath, eventually causing the tiles to come loose. I seem to recall it was also a Schönox product. The company combed the adhesive across the slight slope. I think water has also entered through the joints (which are never watertight) and collected under the tiles. I wonder if it is better not to comb the adhesive at all to prevent voids. It should be noted that it is in a south-facing position with extremely high temperatures in the summer. There is now a risk that I may have to redo everything. Please share your thoughts.

I will use Schönox TTS8 adhesive

Regarding the construction, I have done a lot of research on different methods to prevent what you describe, which is a common problem (almost unavoidable) with outdoor tiles in Sweden.
I will not use any waterproofing layer since the construction allows water to pass through; if you pour a bucket of water, it runs right through. To avoid frost damage, the tiles will be double-bonded. I also plan to use epoxy grout to try to prevent water from penetrating the joints. After a couple of years, this grout will probably also allow water through, but I hope the lightweight concrete substrate will absorb the moisture instead of causing water accumulation between the adhesive/tile and the substrate. Additionally, the entire patio has a slope of 1cm/meter.

I have considered some type of waterproofing, but I don't believe in it outdoors since the normal surface tension of water between the waterproofing and adhesive should be enough to break a tile loose in frost? My own theory, but I would love to hear what others think?

 

[goosen]

I know that Schönox has a Balterra system for waterproofing that breathes outdoors but it's outside my budget.

 

[Johan456]

There are no wooden boards in the picture? As I said, it's the construction of light expanded clay aggregate concrete

I thought it looked like you had placed something on decking boards. But then I'll leave the thread.

 

[nino]

First, I applied a waterproof layer, Ardex Tricom with 8+9 (slight reservation as I might remember incorrectly), then the tiles with Ardex X78, 60x60cm. That was almost 10 years ago, and I usually ask the person I did it for if it still works, and so far it has. Now, it was on concrete and possibly with a warm room below, but no underfloor heating. Quite sure we grouted with Ardex grout, regular not epoxy.

But as I said, I would have called Schönox support and talked a bit first.

 

[goosen]

I first applied a waterproofing layer, Ardex Tricom with 8+9 (with some reservation if I remember incorrectly), then the tiles with Ardex X78, 60x60 cm. It's probably soon 10 years ago, and I usually ask the person I laid it for if it's still working and so far it has. Now this was on concrete and possibly a warm room underneath, but not underfloor heating. I'm pretty sure we grouted with Ardex grout, regular, not epoxy.

But as I said, I would have called Schönox support and had a little chat first.

Okay, thanks for the info. I've talked to Schönox, and they say the adhesive works fine for the purpose. Can you see anything negative about not having a waterproofing layer and using a substrate that allows any moisture to pass through?

 

[mickeparkinson]

I first applied a waterproofing layer, Ardex Tricom with 8+9 (slight reservation as I may remember incorrectly), then the tiles with Ardex X78, 60x60cm. It's been almost 10 years now, and I usually ask the person I laid it for if it's still working, and so far it has. Now it was on concrete and possibly a warm room underneath, but not underfloor heating. Pretty sure we grouted with Ardex grout, regular, not epoxy.

But as I said, I would have called Schönox support and talked a bit first

I think you lay tiles 60 x 60, 20 mm thick, and they rest on pedestals. Difficult with adhesive -5 night, +4 day.

 

[mickeparkinson]

Tell me. I have tiles on a concrete patio for 10 years, but they are starting to come loose now, and moisture is seeping through. The company initially applied a waterproof layer (some kind of duka, blue) and then tiles with adhesive and grout. At the edge, water has seeped underneath, eventually causing the tiles to come loose. I seem to remember it was a Schönox product. The company combed the adhesive across the slight slope. I think water has also seeped in through the grout (which is never waterproof) and has collected under the tiles. I'm wondering if it would be better not to comb the adhesive at all to prevent voids. It should be noted that it is south-facing with extremely high temperatures in the summer.
There's a risk now that I have to redo everything.
Please share your thoughts.

Hi, laying tiles on feet is good, can be lifted for maintenance.

 

[pennybridge]

Tell me. I have tiles on a concrete patio for 10 years but they are starting to come loose now, and moisture is seeping through. The company first laid a waterproof layer (some kind of blue membrane) and then tiles with adhesive and grout. At the edge, water has penetrated underneath, eventually causing the tiles to come loose. I remember it was a Schönox product. The company combed the adhesive across the slight slope. I think water has also come in through the joints (which are never watertight) and has accumulated under the tiles. I wonder if it's better not to comb the adhesive at all to prevent voids. It should be noted that it is south-facing with extremely high temperatures in the summer. There is now a risk that I have to redo everything. Feel free to share your thoughts.

I have learned that you should also apply adhesive on the tile itself when laying outdoors and on garage tiles. It is not sufficient to only have adhesive on the floor surface.

 

[mickeparkinson]

I have learned that you should apply adhesive to the slab as well when laying outdoors and for example on a garage floor. It is not enough just to put adhesive on the floor surface, i.e.

sometimes even that is not enough.