Ordered 5/8 solid strand bamboo that I will be nailing down. I have sturdy 3/4 subfloor and I will be adding 3/8 plywood to raise floor to adjacent tile. Not planning to glue and screw 3/8 to existing sub (just screw) based on advice elsewhere. Is this right? Also, do I need a foam underlayment and vapor barrier (or a combo foam) or just felt paper? No moisture issues in rooms where install is.
I appreciate any help.