Oct 12, 2005 · Depending on the usage of the room below you may want to stay with 5/8" as it deadens the sound slightly better. Personally, if I were to construct a home theatre room I would apply z-bar to the u/s of the joists, then a double layer of 1/2". Angled walls (not parallel) would be a must! USG Sheetrock® Brand Firecode® X Panels (UL Type SCX) are 5/8 in. (15.9 mm) Type X panels that feature a fire-resistant gypsum core that is encased in 100% recycled face and back papers. The panels are UL Classified for fire resistance and can be used in any UL Design in which Type SCX panels are listed. houston materials - by owner - craigslist. ... favorite this post Jan 13 SHEETROCK IN [email protected] INSULATION $0 pic hide this posting restore restore this posting. $0. I have a situation where I need to fasten a light gage track to a stud wall thru 5/8" sheetrock to resist shear from gravity loads. I am trying to avoid this, but my client is pushing me to at least do some research. Shop drywall panels in the drywall section of Lowes.com. Find quality drywall panels online or in store. The existing Sheetrock can be removed and the plywood can be nailed directly to the wall studs, or it can be installed over existing wall material to save time and money. So long as it is nailed into the studs of the wall, plywood can easily go over paneling, Sheetrock and even plaster with the right installation equipment.