Can I achieve STC 60 with a single stud wall or do I need to go with a double stud assembly?

You can achieve STC 60 with a single stud wall, but it requires a carefully engineered assembly with premium materials and flawless installation. A double stud wall reaches STC 60 more easily and more reliably, with greater margin for error — so the right choice depends on your budget, available space, and how critical it is that you actually hit that target. For most Ottawa homeowners, the single-stud approach with sound isolation clips is the practical sweet spot, while double stud walls are reserved for dedicated home theatres, music studios, and professional recording spaces.
To reach STC 60 on a single 2x4 stud wall, you need every element working together: sound isolation clips (RSIC-1 or equivalent) at the correct spacing, hat channel, two layers of 5/8" Type X drywall on each side with Green Glue compound between the layers, 3.5" Roxul Safe'n'Sound filling the cavity, and every edge, penetration, and outlet box sealed with acoustic caulk and putty pads. This assembly has been lab-tested at STC 58-63 depending on the specific clip product and drywall combination. In Ottawa, this wall runs approximately $25-$40 per square foot installed, and for a 10x8-foot wall, you are looking at $2,000-$3,200.
When Double Stud Walls Make Sense
A double stud wall uses two completely separate stud frames with a 1-2 inch air gap between them, eliminating any structural connection between the two sides. This is the gold standard in sound isolation because there is physically no path for vibration to travel through the studs. A double stud wall with mineral wool insulation and double drywall on each side routinely achieves STC 60-70 without needing isolation clips or Green Glue, though adding those components pushes performance even higher. The trade-off is space: a double stud wall is approximately 10-12 inches thick compared to 6-7 inches for a single stud with clips, consuming 4-6 inches of room width — significant in smaller Ottawa homes and condos.
Cost for a double stud wall in Ottawa runs $30-$50 per square foot including framing, insulation, drywall, and finishing. The additional framing lumber and labour adds roughly $8-$15 per square foot over the single-stud clip assembly. For a dedicated home theatre room in a Kanata or Barrhaven basement, where you are already investing $15,000-$40,000 in the overall space, the premium for double stud walls is proportionally modest and delivers noticeably superior low-frequency isolation — exactly where music and movie bass live.
The honest answer for most residential situations in Ottawa is that a single stud wall with isolation clips, double drywall, and Green Glue achieves STC 58-63, which is close enough to STC 60 that most homeowners cannot perceive the difference compared to a double stud wall. If you are building a serious music room or home studio where STC 65+ is the target, go double stud without hesitation. For everything else, the single-stud approach saves space and money while delivering excellent results. Have a soundproofing professional evaluate your specific project — the Ottawa Contractor Directory at justynrookcontracting.com/directory is a solid starting point for finding experienced acoustic contractors in the Ottawa area.Looking for experienced contractors? The Ottawa Construction Network connects homeowners with qualified professionals:HomeupgradersRenoMotion Inc.Eastern Residential SolutionDreamwood Construction & RenovationsTiptop ContractingView all contractors →