Revisions log for Answer #240
This is the answer to the question What substrate to use under the vinyl floor if the thickness of the vinyl is 4.5 mm, and the desired height of the installation – 12 mm?
Revision 1
If the height difference between adjacent building elements (or adjacent rooms) is 12 mm and the PVC flooring is 4.5 mm, the calculated (rounded) height difference is only about 7 mm.
If the PVC floor is glued, the difference between the two is about 3.5 mm more for the glue layer. This leaves a height difference of 3.5 mm. In any case, the whole surface should be filled in beforehand, and we can easily accommodate 3.5-4 mm at this stage.
Now an example of a floating installation:
The height difference is 12 mm – 4.5 mm = 7 mm (see above). Since the empty space will have to be filled anyway (highly recommended!!), and the kitchen area will be an acceptable size, the extra cost of filling (5 mm total) is not significant. That leaves 2mm, which is absorbed by the transition profile in the next room.
The latter option is the most reasonable, because there are no "half measures" in the new structure. For example, when the room transitions by 0.6 m, fill ramps, etc.
Underlayments for resilient floor coverings are also not tasked with compensating for height differences!Unsightly joint formations are almost inevitable due to foot traffic and point loads of furniture.
Which option you choose is entirely up to you.