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How thick should the vinyl be – 4 or 7 mm?

We are currently in the construction phase. All rooms except the bathroom, toilet and maintenance room need to be vinyl lined.

My general contractor recommends vinyl flooring with a minimum thickness of 7mm, otherwise the screed will have to be laid higher due to the height difference with tile. However, my flooring contractor recommends that I use 4mm vinyl because starting at 4mm vinyl is covered by some kind of coating that he personally can't recommend.

What do you think? Do I need to raise the screed so that the 4mm vinyl is flush with the tile? Use thicker vinyl so the screed is more or less the same height?

• floor
• vinyl flooring