VERY early stages of finishing basement...have a zillion questions!
Your floor framing uses those trusses made up with 2x4's instead of 2x8 or 2x10 joists and the horizontal pieces of 2x4 ending short of the foundation wall are not compromised in terms of strength.
Right now I am thinking of making rectangles (maybe 14" wide by 8" tall) out of pieces of 2x4 and fastening these to the subfloor underside (the "ceiling"), perpendicular to and between the trusses, and directly above where the new wall framing shoule be. Then fastening the new wall framing cap (upper horizontal 2x4) to the underside of those rectangles. (The height of the rectangles is so that the new wall framing clears the diagonal members of the trusses.)
For starters, do not drill through or trim away or alter the trusses in any way. Do not cut or pry off any portion of the perforated metal rectangles. They were scientifically designed to support the floor and a hole drilled in the wrong place can drastically weaken the truss. (There are some places where it is safe to drill but I'm not sure where.)
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.
Last edited by AllanJ; 12-26-2012 at 08:30 PM.