cheapest way to raise floor height.......

in the back half of the house we have tiles, and in the front half of the house we have pine floorboards which are old and crappy

At the join there is a 52mm drop from the tiles, we have decided to put down 14mm click lock bamboo strandwoven floor boards, meaning i need to raise the floor another 38mm

Because i need to have a solid flooring for the floating floor i will probably lay some 19mm yellow tongue

My question is, what is the best way to build up the other 19mm? use some timber battens, if so how far apart for the yellow tongue? 300mm?

Or will it be easier to lay two sheets of the yellow tongue?

Or am i missing something that would be cheaper/easier all together

Am i right in thinking i can just screw straight into the pine flooboards, and i do not need to find the joists below?

Any help is much appreciated


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