Hi,

We had some remodeling done and I disccovered that the existing flooring was particle board that had gotten wet and was deteriorating so I decided I would replace it with 3/4" Advantech. I pulled up the particle board and found what looks like the original Oak T+G 3/4"x6" "sub-flooring". I'm going to leave the "sub-flooring" in place as it is in pretty good condition and it only helps to make the floor that much stiffer. A friend suggested that I put tar-paper between the original "sub-flooring" and the new Advantech as a vapor barrier and to help eliminate any noise issues (there was tar-paper between the "sub-floor" and the particle board that I pulled up). Also, the makers of Advantech suggest that you glue it down where it lays over a joist. So because of these two recommendations I layed out the tar paper in strips so that where the Advantech would lay across a joist I could glue it (see attached photo). I'm guessing that when Huber Mfg. suggested gluing the Advantech down they probably had in mind the Advantech laying directly on the joist. So, my case is a little different. Laying out this tar-paper was time consuming and I had a fair amount of tar-paper "waste". So, I have a couple of quetions:

1.) Do you think that it is really necessary to put the tar-paper between the old Oak T+G and the new Advantech? Wouldn't the Oak T+G act as a vapor barrier for the Advantech? Will the tar-paper help in other ways (e.g. noise)? Also, the joists do have insulation between them.

2.) Should I even worry about gluing the Advantech down to the Oak "subflooring" at the points where the Advantech lays across a joist? I'm nailing the Advantech usining an air-gun with 3" 10d ring-shank nails at the joist and 2" 8d ring-shank nails at non-joist locations. Lastly, is there a reason I *shouldn't* glue the Advantech down?

3.) Should I just keep doing it as I am, laying out the tar paper in "strips"?

Thanks