Hall Floor to board or not?

[ptarmigan]

Have 6 Sqm hall and intend to lay Marley Tarkett vinyl plank tiles,at the inner end of the hall the flooring is poured asphalt the rest being finished concrete to protect incoming services and is hard as nails the difference because a new front door frame was fitted and the old one removed so the asphalt was on the inside,intend to remove the asphalt and level as there is a 3or4 mm difference between them and cover the whole area with5/6 mm wbp ply using f46 adhesive and then use f46 to fix the tiles,reason for the ply would be to give a warmer feel to the floor as we have MT tiles in the kitchen and it is a cold floor,there are no signs of damp in the hall.
Also if the ply option is ok although a pita cutting around stairs would it be best to lay in large as possible sheets to minimise joins.

 

[dazlight]

The Ashpalt could be your dpm mate, do you know if there is a dpm under the concrete under the Ashpalt ?

 

[ptarmigan]

Daz, Not sure,the house is ex council and built about mid 60s early 70s,had to break some asphalt up when the kitchen was done so put a layer of heavy plastic sheeting down before the cement went in to be safe,think the house cement floor has been poured over large aggregate that looked like it had a sloppy wash of cement if that makes sense,not had damp problems anyplace in 25 years.