Vinyl tiles over floorboards

If I was going to do your floor I would put a 3-5mm ply down then lay the floor on top of that. Over time can be anything from weeks to years depending on how often the floor will be walked on. Ie: high traffic area

I've been laying all types of flooring for over 15 years, and yes ply underlay is needed but that is needed for a clean bonding surface for your adhesive vinyl tiles and applying the ply board will prevent cracking of vinyl tiles, in regards to your question you should be able to walk on it straight away and your should expect wear and tear over the course of several years as it is to be expected. If the floor your laying on is used alot like a hallway from front door then wear and tear will be increased.
Hope this helps kind regards Jason.

Hi, over time can be 2 weeks to 6 months, that depends how much the floor will be used. In any case the underlay is needed also to create a straight smooth substrate for the tiles witch will help to nor damage the tiles with the time and also for avoid to feel any imperfection of the floor.

There's a couple of different types of vinyl tiles (click together and glue down) and while the click together type is slightly more forgiving, they both need a very flat and smooth base.
Without seeing the floorboards i couldn't say 100% if it needs plying or not but my first reaction on hearing 'floorboards' is that installing plywood first is essential.
6mm thick ply is the usual and 9mm if the floorboards are wonky. If you were to lay the vinyl tiles directly to the floorboards then you stand a high chance of failure of the locking system of the click type and i wouldn't even like to imagine installing glue down tiles direct to floorboards.

You would need to ply the room out or if it’s concrete a screed would be best

Depends on how flat your subfloor is, and the type of product you put down. Usually pretty quickly within a few months, this will depend on foot traffic though.

If you are spending money putting vinyl down, spend the extra to get the subfloor right. If you don't then pulling it back up to reprep and lay it will be more expensive

Hello there hope you’re okay yes I would highly recommend not put in a vinyl plank straight on top or floorboards for one floor boards are not treated and yes you would need to put a WPB plywood down before installing and probably will take around about a month for the Lions underneath to start showing through so I would highly recommend not installing on top of floorboards thanks Jordon

Answer varies depending on the product you use and type of sub floor prep you agree on

It would happen quite quickly but the most important thing is to follow the manufacturers instructions as vinyl tiles normally come with quite a long period of guarantee. The ply should also be sp101 and at least 6mm thick

Will need to be ply boarded and feather edged on the gaps

To be fair all depends on amount of traffic but I would defiantly ply it out