I am about to lay vinyl flooring in my kitchen. On the floor at the
moment are 25 year old Marley tiles

I have been warned that these are stuck down with bitumen which can
seep through and discolour my vinyl flooring. I dont want to take up
the tiles+bitumen, it would be a horrible job and the floor would end
up a lot less flat then it is now

so before I lay the vinyl I want to put down something which is
impermeable to bitumen. Suggestions so far are

- Hardboard
- Latex
- Plastic sheet

Or am I just looking for work? Bitumen seep has not caused me problems
so far

Anna