Madmatz vinyl tiles.....

just wondering firstly how much underlay do we need? It gives options of one roll or two?
And Ali edge trim...8mm or 14mm? What is this anyway?

 

I used one layer of underlay, then sheet of 9mm ply, and it looks and feels great.

 

The alloy trim just finishes off the floor nice and neat by the sliding door.

 

So we need to know the ply that the carpenter whose doing the cupboard so using before ordering the trim?