How much does QuietRock soundproof drywall cost compared to standard drywall with damping compound?

QuietRock soundproof drywall typically costs $40–$65 per sheet compared to standard 5/8-inch drywall at $14–$18 per sheet, but the real comparison requires looking at the full system cost — and the answer is closer than most homeowners expect.

The True Cost Comparison: QuietRock vs. Double Drywall + Green Glue

Standard acoustic practice uses two layers of 5/8-inch Type X drywall with Green Glue Noiseproofing Compound sandwiched between them. For a typical 10×8-foot wall (80 square feet), that breaks down as follows. You need roughly 5 sheets of drywall for each layer, so 10 sheets total at $14–$18 each — call it $160–$180 in drywall. Green Glue runs $15–$22 per tube, and you need approximately one tube per 16 square feet, so about 5 tubes for that wall — another $75–$110. Your total material cost for the double drywall system lands around $235–$290 for 80 square feet.

QuietRock for the same 80 square feet requires only 5 sheets at $40–$65 each, totalling $200–$325 in materials. On paper, the costs are surprisingly similar — QuietRock can actually be cheaper on the low end, or modestly more expensive on the high end depending on your supplier.

Where QuietRock genuinely wins is labour. Installing a single layer of QuietRock takes roughly half the time of installing two layers of drywall with Green Glue applied between them. Green Glue is messy and time-sensitive — it needs to go on quickly and the second drywall layer must follow immediately. In Ottawa, where drywall labour runs $2–$4 per square foot, cutting your installation time nearly in half can save $300–$600 on a single wall. For a full room, those savings add up significantly.

Performance-wise, both systems are competitive in the STC 50–55 range when properly installed over resilient channel or isolation clips. QuietRock 510, the most common residential product, is rated for assemblies reaching STC 52–56 depending on the full wall configuration. Double drywall with Green Glue performs similarly — but here is the important nuance: Green Glue's performance improves over 30 days as the compound fully cures. Ottawa's cold winters matter here — if you are installing in an unheated space below 10°C, Green Glue will not cure properly, making QuietRock the more reliable winter option.

One practical pitfall to watch: QuietRock panels are heavier and more brittle than standard drywall, which makes them harder to cut and handle. Inexperienced installers can crack them, wasting expensive material. The panels also require careful fastener placement — too close to the edge and the panel's internal damping layer can delaminate.

For Ottawa condo owners in Centretown or the Glebe dealing with party wall noise, QuietRock can be an attractive option when ceiling height is limited and you cannot afford the extra thickness of a double drywall layer. In Barrhaven or Kanata new builds where a full wall assembly is being constructed from scratch, the double drywall and Green Glue approach often provides better value when labour costs are already factored into a larger project.

The honest answer is that neither product is inherently superior — the right choice depends on your timeline, your installer's experience, your ceiling height constraints, and whether the space will be heated during installation. Both systems need proper decoupling, air sealing, and acoustic mineral wool insulation to reach their rated performance.

For a project like this, it is worth having an experienced soundproofing contractor assess your specific wall assembly and recommend the most cost-effective approach for your situation. You can connect with local professionals through the Ottawa Contractor Directory at justynrookcontracting.com/directory.