I am about to undertake the first fix carpentry on my new build. My carpenter tells me the best way to put down the floors upstairs is to put plywood on top of the joists - then put down battens and insulation between the battens - then put down the timber floors on top of the battens. We would put insulation under the plywood (between the joists) when putting on the ceiling slabs downstairs.
Do you think this is a good approach in terms if heat and sound insulation? Can anyone recommend the type of insulation to use?