code-compliancedrywallframingstuds
I am framing my basement tomorrow and I'm thinking of using 24" OC for my interior non-load bearing walls. I plan on using 2 sheets of 5/8" sheet rock with a noise dampening compound.
Is 24 OC legal or within the bounds of the UDC (universal dwelling code)?
As I understand your question, you do not want to run the inside wall all the way to the ceiling so that you can keep the wall space above the new knee walls. If so you will certainly want to cap the space at the top of the knee wall to leave a good grounding for a finished surface. One way that you can do this is to attach a 2x2 to the inside of the exterior wall and then bridge across from the exterior wall and the top of the knee wall. The bridging plank can be cut to width from a standard sized plank such as a 2x10 or 2x12. Installation in this manner will both support the top of your knee wall and cover the gap between the two walls.
In terms of finishing you could choose to cover this area with drywall or a nice looking board that you would finish to suit your needs.
International Residential Code 2009
Chapter 6 Wall Construction
Section R603 Steel Wall Framing
R603.1 General. Elements shall be straight and free of any defects that would significantly affect structural performance. Cold-formed steel wall framing members shall comply with the requirements of this section.
R603.3.4 Cutting and notching. Flanges and lips of cold-formed steel studs and headers shall not be cut or notched.
603.3.4 is a requirement of section 603, and so all cold-formed steel wall framing members must comply with it. Meaning that whether the wall is load-bearing or not, the framing members cannot be notched.
Best Answer
According to IBC2009 Section & Table 2308.9.1 Page 483. If using Utility Grade studs your wall can't be any taller than 10' & your studs (2x3's or 2x4's) must be no more than 16"oc.
WI's Uniform Dwelling Code (UDC) Page 43 & 44 Section & Table SPS 321.25.A doesn't have the IBC's utility stud stipulation. Therefore, 24"oc is fine if your wall is no more than 14' tall for 2x4's. But, with 2x3's you still must be 16"oc with a wall no taller than 10'.
However, if you're worried about being "legal", then you should apply for a permit to have your design approved & be wiling to conform to all other standards & inspections. Such as, GFCI protected electrical outlets every 6', air conditioned space similar to the rest of the house, insulation, ceiling & floor finishes & emergency egress. Basically, willing to make it truly habitable space, so they can bump up your taxes after they bled you dry with fees.