🔊 QuietRock Soundproof Drywall Calculator

QuietRock Soundproof Drywall Calculator: STC Ratings, Sheet Count vs Standard Drywall Layers

Built and reviewed by (MBA Finance) · Updated October 2026

Select your QuietRock product (EZ-SNAP, 510, or 545), choose which walls and ceiling to soundproof, and enter room dimensions with door and window deductions. Get QuietRock sheet count, equivalent standard drywall layer comparison, acoustic sealant, joint compound, and a side-by-side STC performance table to justify the cost premium to your client or contractor.

Home› Interior DIY› QuietRock Soundproof Drywall Calculator
🔊 Product, Room Size, and Surfaces
■ QuietRock Product Selection
■ Room Dimensions
ft
ft
■ Surfaces to Soundproof
■ Openings to Deduct
ea
ea
sq ft
■ Sheet Size, Waste, and Optional Pricing
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Your QuietRock estimate appears here

Select your product (EZ-SNAP, 510, or 545), enter room dimensions, check which walls and ceiling to soundproof, and enter openings to deduct. Results show QuietRock sheets needed, a side-by-side STC comparison vs standard drywall layers, acoustic sealant, and joint compound quantities. Optionally add prices to see the cost premium vs standard double-layer drywall.

QuietRock Material Summary
0 QuietRock sheets
45 STC rating achieved
0 std layers to match STC
Area Breakdown
Surfaces selected–
Gross soundproofed area–
Opening deductions–
Net area–
With waste–
QuietRock sheets needed–
📊 STC Comparison: QuietRock vs Standard Drywall
MethodSTCLayersSheetsNotes
🛠️ Consumables
Joint compound (5-gal buckets)–
Drywall tape (250-ft rolls)–
Acoustic sealant / caulk (10-oz tubes)–
Drywall screws (1-lb boxes)–
Sheet Count: QuietRock vs Standard Drywall to Match STC

QuietRock Soundproof Drywall: STC Ratings, Products, and How One Layer Replaces Multiple Standard Sheets

QuietRock is the leading brand of sound-damping drywall in the US, manufactured by PABCO Gypsum. Unlike standard gypsum board, QuietRock panels use constrained layer damping (CLD) technology: a viscoelastic polymer layer bonded between two gypsum layers that converts sound energy into negligible heat as vibrations pass through the panel. The result is a single panel that achieves Sound Transmission Class (STC) ratings that would otherwise require two, three, or more layers of standard drywall plus resilient channel and additional assembly components.

The STC rating measures how effectively a building assembly blocks airborne sound. An increase of 10 STC points roughly halves the perceived loudness through a wall. Standard single-layer 5/8-inch drywall achieves STC 33-35. QuietRock EZ-SNAP and 510 achieve STC 45 with a single layer: the same performance as double 5/8-inch standard drywall, but at half the weight and half the installation time. QuietRock 545 achieves STC 52, requiring three or more layers of standard drywall plus resilient channel to match.

QuietRock Product Comparison and US Alternatives

ProductSTCThicknessWeight / sheetBest For
QuietRock EZ-SNAP 510451/2 in~54 lbs (4×8)DIY, standard scoring and snapping
QuietRock 510451/2 in~54 lbs (4×8)Professional installation
QuietRock 545521.75 in~100 lbs (4×8)Home theater, recording studio, commercial
CertainTeed SilentFX (alternative)45-525/8 in~70 lbs (4×8)Similar CLD technology
National Gypsum SoundBreak XP (alternative)525/8 in~70 lbs (4×8)Similar premium STC

How the QuietRock Calculator Works

Selected wall areas are computed from room dimensions: long walls = 2 x (length x height), short walls = 2 x (width x height), ceiling = length x width. Each surface is added only if the corresponding checkbox is selected. Opening deductions = (doors x door_size_sq_ft) + (windows x avg_window_sq_ft). Net area = gross minus deductions. With waste: net_area x (1 + waste_factor). QuietRock sheets = ceil(area_with_waste / sheet_sf). Standard equivalent layers: STC 45 requires 2 layers, STC 52 requires 3 layers of standard drywall. Standard equivalent sheets = QR_sheets x layers. Acoustic sealant: 1 tube per 50 linear feet of perimeter plus 1 tube per opening edge. Joint compound: 1 bucket per 500 sq ft. Tape: 1 roll per 400 sq ft. Screws: 1 lb per 150 sq ft.

3 Real QuietRock Estimates

Example 1: Home Theater Room, 16 x 14 ft, 9-ft Ceilings, All Walls and Ceiling

Product: QuietRock 545 (STC 52). Room: 16 x 14 ft, 9-ft walls. All 4 walls + ceiling. 1 door (20 sq ft). No windows.

Wall area: 2 x (16 + 14) x 9 = 540 sq ft. Ceiling: 16 x 14 = 224 sq ft. Total: 764 sq ft. Deductions: 20 sq ft. Net: 744 sq ft.

With 10% waste: 818 sq ft. Sheets (4×8 = 32 sq ft): ceil(818/32) = 26 sheets of QuietRock 545.

Standard equivalent to STC 52: 3 layers = 26 x 3 = 78 sheets of standard 5/8-inch drywall (plus resilient channel and hat channel for proper assembly). The QuietRock approach saves 52 sheets and eliminates the complex resilient channel installation.

Acoustic sealant: Perimeter = 2 x (16+14) = 60 lin ft. 60/50 = 2 tubes, plus 1 tube for the door opening = 3 tubes acoustic caulk.

Example 2: Master Bedroom Shared Wall Only, 14 ft Long, 8-ft Height, Nashville, TN

Product: QuietRock EZ-SNAP 510 (STC 45). Only 1 long wall selected (shared with noisy neighbor). Wall: 14 x 8 = 112 sq ft. No openings.

With 10% waste: 124 sq ft. Sheets: ceil(124/32) = 4 sheets of EZ-SNAP.

Standard equivalent: 2 layers x 4 = 8 sheets of standard 1/2-inch drywall. But the 8 standard sheets would add 1 inch to the wall thickness and require two sets of finishing coats. The 4 QuietRock sheets are the same thickness as 1 standard sheet and finished identically.

Consumables: JC: 1 bucket. Tape: 1 roll. Acoustic sealant: 1 tube (for perimeter edges of the single wall). Screws: 1 lb.

Example 3: Condo Shared Wall and Ceiling, 20 x 15 ft Room, IBC STC 50 Requirement

Application: Residential condo conversion project in Chicago. The IBC requires STC 50 minimum for walls and floors between dwelling units. Product: QuietRock 545 (STC 52, exceeds requirement). Surfaces: 1 long wall (shared with adjacent unit) + ceiling (shared with unit above).

Wall area (shared long wall): 20 x 9 = 180 sq ft. Ceiling: 20 x 15 = 300 sq ft. Total: 480 sq ft. With 10% waste: 528 sq ft. Sheets: ceil(528/32) = 17 sheets of QuietRock 545.

IBC note: STC 52 (QuietRock 545) exceeds the IBC Section 1207 minimum of STC 50. Standard 5/8-inch double-layer drywall achieves STC 40-44, which does NOT meet IBC requirements for between-unit walls without additional measures like resilient channel, additional layers, or mass-loaded vinyl.

3 Expert Tips for QuietRock and Soundproofing Drywall

🔊 Tip 1: Acoustic Sealant at Every Edge Is as Important as the Drywall Itself

The single most overlooked component in US DIY soundproofing projects is acoustic sealant (also called acoustic caulk or soundproofing caulk). Sound, like water, finds the path of least resistance. A wall built with QuietRock 545 achieving STC 52 can have its effective STC reduced to below 35 by a single gap at the base of the wall where standard painter’s caulk has been used instead of acoustic sealant, or where no sealant was applied at all. Acoustic sealant is a non-hardening, permanently flexible elastomeric compound that stays flexible indefinitely (unlike standard caulk that hardens and cracks) and is specifically formulated to remain acoustically decoupled from the building structure. The most widely used products in the US are Green Glue Sealant and OSI SC-175 Acoustic Sealant. Application locations in a soundproofed room: the full perimeter of every QuietRock panel where it meets an adjacent panel at a butt joint, the perimeter of every electrical outlet and switch box penetration (outlets are major flanking paths), the base of all walls at the floor line before baseboard installation, any pipe or conduit penetrations through the soundproofed surface, and the perimeter of the door frame opening. Budget 1 tube of acoustic sealant per 50 linear feet of seam and edge, which this calculator includes in the consumables output. Do not substitute standard latex or silicone caulk for acoustic sealant: they harden over time and transmit vibration rather than absorbing it.

🚪 Tip 2: A Solid-Core Door Is Required to Preserve the Wall STC: Hollow-Core Doors Defeat the Purpose

Many US homeowners spend $800 to $1,500 on QuietRock panels and professional installation, then install a standard hollow-core interior door (STC 20-25) that immediately becomes the dominant weak point in the soundproofed assembly. The STC of any assembly is only as high as its weakest element. A wall built to STC 45 with a hollow-core door in it effectively achieves the STC of the door, around STC 22, because sound simply bypasses the high-performance wall panels by transmitting through the door. In US residential construction, solid-core doors (STC 28-35 for a standard 1-3/8-inch solid wood or mineral-composite core door) are the minimum upgrade when soundproofing a room. Specialty acoustic doors (STC 40-55) are available from US suppliers for home theaters, recording studios, and commercial applications. For a complete soundproofed room at STC 45 using QuietRock 510, you need: QuietRock panels on all shared surfaces, acoustic sealant at all perimeters, a solid-core door with an acoustic threshold seal and door bottom sweep, and acoustic putty pads on all electrical outlet and switch boxes on shared walls. The threshold seal and door sweep are available at most US door hardware suppliers for $30 to $80 and contribute significantly to the effective acoustic performance of the completed assembly.

🏠 Tip 3: Cut QuietRock EZ-SNAP the Same Way as Standard Drywall but Allow for Extra Blade Passes

QuietRock EZ-SNAP was specifically engineered to be cut using the same score-and-snap method as standard drywall, which is what distinguishes it from QuietRock 510 (which requires a specialized scoring technique due to the viscoelastic polymer layer making the panels more resistant to clean snapping). For EZ-SNAP: score the front paper deeply with a utility knife using a T-square, snap the panel away from the score line, then cut the back paper. The CLD polymer layer may require an additional knife pass to sever cleanly. Use a sharp blade and replace it more frequently than you would for standard drywall: the polymer layer dulls blades faster. Avoid attempting long rip cuts with a circular saw on QuietRock, as the polymer layer tends to gum the blade. For QuietRock 545 (1.75-inch thick), cutting requires a jigsaw or circular saw because the panel is too thick to score-and-snap. A 545 panel weighs approximately 100 pounds (4×8 size), making two-person installation mandatory: solo ceiling installation of 545 is not practical without mechanical lift equipment. For all QuietRock products, screws must be driven at 16-inch on-center spacing to studs and at 12-inch spacing in field areas (not at stud locations) for panels that span more than 16 inches between framing. The panel weight makes proper fastening especially critical because undertightened screws in heavy panels can lead to long-term sag.

Frequently Asked Questions About QuietRock and Soundproof Drywall

Is QuietRock worth the cost over standard drywall?▼
For most US homeowners tackling a soundproofing project, yes: QuietRock provides a significantly better return on the installation labor investment than standard drywall because the labor cost of installation is the same per sheet regardless of which drywall you use. If achieving STC 45 requires two layers of standard drywall, the labor to hang, tape, and finish 32 sheets equals the labor to hang, tape, and finish 16 sheets of QuietRock EZ-SNAP, but the material cost of 16 QuietRock sheets (at approximately $65 to $90 per sheet retail in 2026) is typically lower than the combined material cost of 32 sheets of standard 5/8-inch drywall plus the additional joint compound, tape, and fasteners for the second layer. The break-even analysis shifts even further in QuietRock’s favor when you factor in the wall thickness: double-layer standard drywall adds 1.25 inches to each wall, which in a small room like a 10×10 home office reduces the usable floor area by approximately 5 to 7 square feet. For QuietRock 545 achieving STC 52, the comparison is even more dramatic: matching STC 52 with standard drywall requires three or more layers plus resilient channel, hat channel, and additional framing, which adds substantial cost and complexity. The one scenario where standard drywall may be preferred: very large rooms where material cost is the dominant factor and installation time is minimal (a large warehouse conversion or commercial space), where the raw material cost difference between QuietRock and standard drywall is larger than the labor savings from using fewer layers.
What STC rating do I need for my US home?▼
The STC rating you need depends on the noise source and the desired acoustic result. General US guidelines: STC 25-30 is the minimum for speech privacy (you can hear loud speech through the wall but cannot understand words). STC 40 is sufficient for most US residential applications: speech is faint and music at normal listening levels is barely audible. STC 45 is the practical target for most US soundproofing projects: speech is inaudible, most music at home listening levels is not perceptible, and impact sounds (footsteps) are reduced. STC 50 is required by the International Building Code (IBC Section 1207) for walls and floor-ceiling assemblies separating dwelling units in multi-family buildings (condos, apartments, townhomes). STC 52-55 is the target for home theaters, recording studios, and professional music practice rooms. STC 60 and above is used for professional recording facilities and broadcast studios where essentially no sound transmission is acceptable. For context: standard 1/2-inch drywall single layer achieves STC 33. QuietRock EZ-SNAP achieves STC 45. QuietRock 545 achieves STC 52. To meet IBC Section 1207 for multi-family buildings, you need a wall assembly rated at STC 50 or higher: QuietRock 545 or CertainTeed SilentFX 545 will meet this requirement as a single layer over a standard wood stud frame, while double-layer standard drywall (STC 40-44) will not.
Can I use QuietRock on a ceiling?▼
Yes, QuietRock can be installed on ceilings, but the product selection and installation approach differ from wall installations. QuietRock EZ-SNAP and 510 (1/2-inch, approximately 54 lbs per 4×8 sheet) can be installed on ceilings using standard methods with appropriate support: a rented panel lift is strongly recommended for solo installers, and T-brace supports are needed for two-person teams holding the panel while driving screws. QuietRock 545 (1.75-inch, approximately 100 lbs per 4×8 sheet) requires a mechanical panel lift and two workers for safe ceiling installation and is not recommended as a DIY ceiling installation without professional-grade lift equipment. For ceiling soundproofing, especially when the goal is blocking impact noise from footsteps above (which is an impact transmission problem rather than an airborne sound problem), QuietRock alone has limited effectiveness. The most effective assembly for ceiling impact isolation in the US combines: QuietRock panels on the ceiling joists, resilient channel (or sound isolation clips like IsoMax or Kinetics RIM) to decouple the drywall from the framing, and an air gap to prevent direct vibration transmission. If footsteps from the floor above are the primary concern, the best solution is often addressing the problem at the source floor with resilient underlayment or mass-loaded vinyl under the flooring rather than (or in addition to) QuietRock on the ceiling below.
How do I finish QuietRock: is it the same as standard drywall?▼
Yes, QuietRock EZ-SNAP and 510 finish identically to standard gypsum board. The paper face on QuietRock panels is identical to standard drywall paper, and joint compound, drywall tape, primer, and paint are applied using exactly the same techniques and materials as standard drywall finishing. Most US drywall finishers and tapers who work with QuietRock report no difference in finishing time or technique compared to standard panels. QuietRock 545 also finishes similarly, though the greater panel weight makes some of the earlier steps (positioning, taping of seams under stress) slightly more demanding. One important note for finishing QuietRock in rooms requiring acoustic performance: butt joints (where the non-tapered edges of two panels meet) should be bedded with an extra-wide tape bead and filled flush, just as with standard drywall. However, the acoustic sealant application (described above) at the perimeter of all panels should be done before taping begins and before joint compound is applied. The acoustic sealant fills the 1/4-inch gap left between the panel edge and the floor, ceiling, and adjacent walls, and this sealant line is then covered by the joint compound and tape at the perimeter seam. Do not use standard painters caulk or latex caulk at these perimeter seams: the acoustic sealant must be in place before the cosmetic finish is applied.
Does QuietRock block low-frequency bass and home theater sound?▼
QuietRock significantly reduces low-frequency sound transmission compared to standard drywall, but no single-layer drywall panel, including QuietRock 545, provides complete bass isolation for a home theater or music production environment. Low-frequency sound (below approximately 250 Hz) is inherently difficult to block because long wavelengths can pass through standard building materials with relatively low attenuation. The STC rating system is also somewhat weighted toward mid and high frequencies, meaning a wall rated STC 52 may actually perform at the equivalent of STC 35-38 at frequencies below 125 Hz. For true home theater bass isolation, a dedicated low-frequency assembly is required: double-stud walls or staggered-stud construction (creating an air gap between the wall surfaces), mass-loaded vinyl (MLV) as an additional mass layer, and QuietRock or another high-mass drywall panel as the finish surface. The air gap between the two stud walls is the most effective tool for low-frequency isolation, as it decouples the room shell from the building structure. For a home theater with a subwoofer operating at 20-80 Hz, even the best single-layer drywall solution will allow audible bass transmission to adjacent rooms. A properly engineered room-within-a-room construction, which this calculator does not cover in full, is the professional standard for high-performance home theater bass isolation.
Where can I buy QuietRock in the US?▼
QuietRock is manufactured by PABCO Gypsum and is available through US drywall distributors and some national home improvement stores. As of 2026, QuietRock EZ-SNAP 510 is available at select Home Depot locations in the US, though availability varies by region and store. The full product line (510, 545, RF shielding versions) is more consistently available through drywall specialty distributors such as USG Distributor Network, Pacific Coast Supply, and Builders FirstSource. For a large project, call ahead to confirm local availability and lead time: QuietRock 545 in particular may require 1 to 2 weeks for delivery from a regional distribution center. Retail pricing in 2026 ranges from approximately $65 to $90 per 4×8 sheet for EZ-SNAP and 510, and $95 to $130 per 4×8 sheet for 545, compared to $14 to $18 per sheet for standard 5/8-inch gypsum board. Alternative brands available through US distributors include CertainTeed SilentFX (similar CLD technology, STC 45 and 52 products), National Gypsum SoundBreak XP (STC 52), and Georgia-Pacific DensArmor Plus SoundGuard (STC 45). All of these alternatives are interchangeable with QuietRock for calculation purposes and can be substituted depending on regional availability and pricing.
Does soundproof drywall work for reducing noise between floors?▼
For airborne sound transmission between floors (voices, TV, music traveling through the floor-ceiling assembly), QuietRock on the ceiling of the lower room or on the subfloor of the upper room is effective and can significantly improve the IIC (Impact Insulation Class) and STC of the assembly. However, for impact noise (footsteps, dropped objects, chair legs scraping on the floor above), QuietRock on the ceiling below is much less effective than addressing the problem at the source: the floor above. The most effective US approach for floor-to-floor impact isolation: install a resilient underlayment (rubber, cork, or acoustic foam) directly under the flooring material on the upper floor. This decouples the hard flooring surface from the subfloor, dramatically reducing the structural vibration that creates impact noise in the room below. Mass-loaded vinyl (MLV) as a supplemental layer under the flooring on the upper level is an additional option. Combining QuietRock on the ceiling below with resilient underlayment on the floor above and an acoustic insulation batt (Rockwool Safe n Sound or similar US product) in the joist cavity is the professional standard for achieving IBC-compliant floor-ceiling assemblies in US multi-family construction. This calculator estimates the QuietRock material for the ceiling portion of this assembly and notes that floor isolation is a separate calculation not covered here.

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Editorial Standards and Legal Disclaimer

Wall areas: long wall = length x height, short wall = width x height; each counted only if surface checkbox is selected. Opening deductions: doors x door_sf + windows x win_sf. Net area = gross minus deductions. With waste: net x (1 + waste). Sheets = ceil(area_with_waste / sheet_sf). Standard equivalent layers: STC 45 uses 2 layers, STC 52 uses 3 layers. STC values cited are from PABCO Gypsum published data for QuietRock products. Actual acoustic performance varies by full assembly design, framing, insulation, and installation quality. IBC Section 1207 STC 50 requirement applies to walls and floor-ceiling assemblies between US multi-family dwelling units; local adoption may vary. Acoustic sealant tubes estimated at 1 per 50 lin ft of perimeter. This calculator is for material estimation only. Consult an acoustic consultant or licensed contractor for design verification. For IBC soundproofing requirements, see iccsafe.org. For QuietRock product data, see quietrock.com. QuietRock is a trademark of PABCO Gypsum. Last reviewed: August 2026.