The tiles are laid in the wrong way. If it is an external tile, it is necessary to apply glue on the substrate and on the tiles in the same direction, so that there are no empty "islands" under the tile. This is exactly what is seen when lifting the tile. Over time, saltpeter will form and potentially accumulate moisture.

Wow exilent sir

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Top quality products 👍

Profi

What happens if you install the membrane upside down? Any ideas?

Did you put thinset before putting the membrane?

Looks like a awesome system

This product looks great but I can't find it for sale anywhere. How do I buy it?

Nice work!! I am interested please contact ducpq118@gmail.com - I come from Vietnam

like

Mega 😁

Excellent job

flat earth

I like your work but I have a question : Did you have a slope (1/4 per foot) on the stair ? In other words how do you make sure that water are not staying on the stair (to avoid slippery situation). Thanks

This is what I needed. Nice work!