ᐅ Glue-down vinyl directly on the screed?

Hello

I have purchased a newly built semi-detached house.
The entire first floor and attic (except the bathroom) will be covered with vinyl flooring.
All rooms have underfloor heating.

I have read that self-adhesive vinyl is better suited because the vinyl is in direct contact with the floor, which allows the heat to transfer more effectively than with tiles. Additionally, the impact sound insulation is said to be much better and more durable.

In all rooms, the screed will be installed as a floating floor.

Question:
Is the floating screed surface smooth enough at the end to apply the self-adhesive vinyl directly,
or does the floor need to be sanded first to achieve a smooth surface?

Or more precisely, should a self-leveling compound be applied in the appropriate thickness? Keep in mind that the screed thickness should be adjusted to the chosen floor covering beforehand. It is better to discuss these points in advance with the screed installer "room by room."

Pwnage619 schrieb:

I have read that self-adhesive vinyl is better because the vinyl has direct contact with the floor and therefore absorbs heat better than tiles. Also, the impact sound insulation is supposed to be much better and more durable.

You can’t generalize that.

Pwnage619 schrieb:

Is the floating screed smooth enough in the end to simply stick the self-adhesive vinyl on it? Or do you have to sand the floor first?

It depends on the type of screed and the method used. As Superzapp already mentioned, using leveling compound and/or a primer coat (before adhesion) is advisable. Just follow the manufacturer’s instructions.

Sanding and applying filler are necessary, otherwise smooth adhesive vinyl will reveal all unevenness.

I just remembered that the search function should show a post by @KlaRa where this exact topic was discussed. As far as I recall, the theoretically existing "air pockets" under click vinyl (and the impact sound insulation beneath it) only cause a slight increase in the inertia of the underfloor heating. So regarding the original poster’s actual question, they’re not really relevant. Otherwise, in my opinion, they matter. Click vinyl tends to "click" or make noise over uneven surfaces, so it’s louder. This is theoretical, but presumably the click joints also experience more stress. Gluing down vinyl flooring is probably not an option without the proper equipment. So it’s best to have a professional handle it. The expert will set the necessary conditions anyway :p

Or simply install click vinyl directly on the impact sound insulation over the raw subfloor—if you’re not a perfectionist—and you’re done.

Thank you for your messages

Self-adhesive vinyl is easier to install than applying adhesive first and then laying the vinyl (like with tiles)

So, does poured screed still have unevenness?