I used recycled gymnasium flooring. Buy about 50% more than you need to allow for wastage (some broken strips were repairable with wood glue). I used water based varnish to finish them. I thought about laying insulation, but decided I would trade a bit of heat loss for extra headroom.
The floor was one of the last things I did - I went for the IVA with a bit of old carpet in place. I wanted to minimize the amount of work I had to do until I knew I had (or would) pass the IVA test.
The floor was one of the last things I did - I went for the IVA with a bit of old carpet in place. I wanted to minimize the amount of work I had to do until I knew I had (or would) pass the IVA test.