I'm in the process of installing a subfloor in the basement. Floor is dry and does not get water. the concrete floor is slanted towards the floor drain about 2" over a 12' span. So I was planning on lying down 2x3 and shimming them to level the floor, and then 5/8 OSB gold edge on top.
1) Should I first lay down a product like Delta FL and the 2x3 on top of that?
2) Is using 2x3 laid flat shimmed every 12" ok ??