I have a 35 year old 18mm softwood floor raised on top of 3cm tall sleepers on a prefab concrete floor (insulated in the crawlspace by about 8cm EPS). I'd like to replace it with a new floor but I'd like the floor level to roughly match the old floor.
I suppose an engineered hardwood floor can be laid on top of the existing sleepers (or can it???) but I'm not sure budget allows for this option. Instead I could opt for PVC or laminate flooring but then it becomes a question of how to raise the floor height to 4-5cm (but not higher!)
I could put 7mm isoboard (wood fibre board), 18mm OSB or underlayment, another 7mm isoboard and top it off with PVC or laminate flooring for a total of about 4cm. However I'm worried there will be too soft to walk on. Instead I could do 2cm sleepers, underlayment, and then isoboard and laminate.
What would be the usual way to go about this?