1)Fastening stud wall to foundation wall; 2)I-beam fastening

[sleepy hollow]

1) I am building a home theater room in my basement (along with finishing out the rest of the basement). The HT is a room-within-a-room concept fro soundproofing

I need to know how to attach the 2 stud walls around the concrete foundation perimeter without touching the floor joists. Are there brackets or fasteners for this? I have a remington .22 fastener gun. But, what is appropriate for holding the stud wall agains the foundation? Or is there another approach?

2) Also, can the .22 gun be used to fasten to a steel I-beam flange? I have been told a higher load cartridge will work?

Thanks.

[mjpliv]

Why not build your false ceiling first and attach that to the walls? Shoot on a rim joist and hang your ceiling joists from that. Then you can frame your walls from concrete floor to newly framed ceiling.

[sleepy hollow]

I do not quite understand. I am planning to attach new ceiling joists. I was planning to attach them to the top plate of the stud walls, in between the existing joists.

The problem with putting up a rim joist is that I want the bottom of the new ceiling joists to hang about an inch lower than the existing joists. So, how would I attach the new joists to a rim joist whose top is at the bottom of the new ceiling joists (roughly)? I am not sure exactly how to make it work.

[mjpliv]

If you are entering the existing floor area then the rim method won't work.

[sleepy hollow]

But I could simply shoot a nailer into the wall for anchoring the studs. Then I could set the top plates to just below the existing joists and add new joists on top. But how do I fasten the new joists? I could extend a nailer up between the existing joists and nail each new joist to both top of plate and extended nailer. Would only be a few inches of extension. So would be pretty solid. Does this sound OK, or am I getting out of control? (Oh, I am also t-bracing the new joists on top to prevent twisting, etc.)