install LTV in special non-even floor

[Al Tro]

I'm planning to pave a ground-floor room with LVT (luxury vinyl floor tiles). This room is actually obtained by removing a wall between a concrete-floor dining room and a suspended wooden floor living room of an Edwardian house. The wooden floor is just slightly lower than the concrete floor. The concrete floor is a bit sloped and there is no visible step between the two rooms.

To complicate things a builder had to install some pipes and cut trough the concrete floor. He added the self levelling compound over the cut, which created two small steps as in the pictures (the black plastic is DPC).

In other words, as the floor is sloped and the cut area is horizontal due to self levelling compound, there are two small but odd steps in the middle of the room.

Now, I'm not sure if this can create problems if we install the LVT. The builder says no and wanted to lay the LVT over directly on the floor ... but I'm a bit skeptical that this really works well.

Can you please recommend anything? It seems that I encounter all possible complications in this floor (wood area + concrete area, cut with DPC, slope, and steps), but hopefully this is not such an issue.

PS: Happy new year!

 

[foxhole]

Depends on the height differential between floor types .?

 

[Al Tro]

Depends on the height differential between floor types .?

Thanks for the reply! At the junction between the two floors there is no difference, since the concrete floor is sloped, and the slope is about 1 cm over a couple of meters. Then there are these gaps where the self leveling compound was poured... Each gap is not more than 2 or 3 millimeters but they are close (please see the figure in the original post)


PS: so sorry for late reply... I missed this reply somehow.

 

[dazlight]

Are you talking click LVT or glue down

 

[Al Tro]

Click LVT. Unless there is a strong reason for using glue LTV?
Thanks!

 

[dazlight]

I won’t even sell it in my shop. We only recommend glue down ( dry back )
If having click, The sub floor has to be flat all over or the headers can come apart.
Any direct hot sunlight will cause problems as well with the planks expanding and the headers can weaken and break.

 

[Al Tro]

So, am i safe with glue down? Do we need to add anything below to flat the surface?

thanks!

 

[dazlight]

You need to remove anything loose. Is there a old smoothing compound on the floor?

 

[Al Tro]

Yes, it is mostly old smoothing compound. There is a section with old and thin plastic tiles, some are loose and i am removing them.

 

[dazlight]

The old smoothing compound must be solid to put another coat over it.