What dB Ratings Actually Feel Like in an Office

Spec sheets list acoustic performance as a single number — 30dB, 35dB, 40dB, 45dB. Architects know what these mean. Most clients don’t. Before deciding whether you need a double glazed glass partition, here’s what each rating produces experientially when someone is on the other side of the wall.

The standard measurement is ISO 717-1 weighted sound reduction (Rw), expressed in decibels. Lower number = more sound transmits through. Higher number = better isolation. The dB scale is logarithmic, so a 10dB difference roughly doubles perceived loudness — a 15dB difference is the practical line between “audible” and “near-silent.”

The 30dB → 45dB upgrade is the difference between “people can tell something private is being discussed” and “no one outside knows a meeting is happening.” For boardroom and banking environments, that distinction directly affects compliance, M&A confidentiality, and patient privacy — making the double glazed glass partition upgrade not aesthetic, but functional. The 45dB threshold has become the de-facto standard for any double glazed glass partition in regulated environments — banking, healthcare, legal, government.

Single vs Double Glazed — Where the Extra 15dB Comes From

A standard single-glazed partition uses one layer of 8-12mm tempered glass. Sound waves travel through the glass mass once, are dampened by the glass density, and emerge on the other side at roughly the original frequency but with reduced amplitude. The net Rw is around 30dB.

A double glazed glass partition uses two layers of tempered glass (typically 5-8mm each) with a sealed air cavity between them. Sound waves now have to:

1. Penetrate the first glass pane (partial loss)
2. Cross the air gap — but the air mass and pane spacing absorb specific frequencies through resonance damping
3. Penetrate the second glass pane (partial loss again)

The compounding effect produces 15dB additional isolation — not double the dB number, but exponential improvement in perceived privacy. The air cavity width matters: too narrow (under 30mm) and the system behaves like a thick single pane; too wide (over 100mm) and panel deflection becomes a structural issue.

Our Great Wall double uses a 47mm cavity. Our Everest double uses 64mm. Both reach the same 45dB peak — but the wider Everest cavity offers more room for integrated louvers and decorative inserts without compromising acoustic performance.

The integrated louver advantage

One question every project asks: what about visual privacy? A 45dB room without window coverings is still acoustically private but visually exposed.

The solution unique to double-glazed systems: venetian louvers installed inside the air cavity. Operated externally via knob or motorized switch, the blinds are completely protected from dust and damage — they never need cleaning, never get bent, and last the life of the partition. External blinds, by contrast, gather dust within 30 days and need replacement every 3-5 years in active offices. The integrated approach is one of the strongest TCO arguments for double-glazed beyond pure acoustics.

Three Double Glazed Configurations

Our double glazed glass partition systems split across three primary configurations. Each fits a different design brief and price point.

1. Great Wall Double Glass (visible frame)

The cost-effective baseline. Two layers of 5/6/8mm tempered glass with a 47mm air cavity, mounted in the standard 74mm Great Wall aluminum frame. Visible frame profile between panels, EPDM rubber gasket snap connection. Optional integrated louvers (knob or motorized). Acoustic rating: up to 45dB.

Specified for general boardrooms, mid-tier executive offices, healthcare consultation rooms, and corporate offices where the visible frame doesn’t conflict with the brief. Full specs and download.

2. Everest Double Glass (hidden frame, 3M bonded)

The premium curtain-wall aesthetic option. Two layers of tempered glass bonded to a recessed sub-frame using 3M VHB structural acrylic adhesive, with 64mm air cavity. Visible frame is eliminated — the partition reads as continuous glass. Same 45dB acoustic peak, with extra cavity room for fully integrated specialty infills (smart switchable glass, paint glass, decorative tinted glass).

Specified for executive boardrooms, premium reception, hospitality, and projects where the architectural brief calls for “curtain wall, not partition.” Full specs and download.

3. Double glazed with built-in louvers (either series)

Both Great Wall and Everest double can be specified with the integrated louver option. Three operating modes:

• Manual knob — external knob operates tilt and lift mechanism. Lowest cost, most reliable, requires occupant action.
• Motorized with switch — wall-mounted toggle or rocker switch operates electric motor. Adds ~$200/m² to the cost. Good for executive rooms where staff don’t want to fiddle with controls.
• Motorized with smart home integration — REST API or Zigbee control for integration with conference room booking systems. Louvers can auto-close when a meeting starts.

The louver option adds about 15-25% to the partition cost depending on operating mode, and adds about 1-2 working days to the install. For boardroom and consultation use cases, it’s near-universal — for general meeting rooms it’s often skipped in favor of external blinds.

Real Installations: Where Double Glazed Was Specified

Three projects from our reference list, each with a specific brief that drove the double glazed glass partition specification. The same double glazed glass partition platform serves all three, configured differently for each acoustic tier:

The Cushman & Wakefield approach — mixing single and double glazed within one floor — is increasingly common. There’s no rule that says you have to specify one tier across the whole floor. Use double glazed where the privacy brief demands it, save the cost premium where it doesn’t.

When Single Glazed Is Actually Enough

This guide would oversell the double glazed glass partition as a universal solution if we didn’t note the cases where you shouldn’t bother. Four scenarios where the 15dB upgrade is wasted:

1. General private offices for individual contributors

The privacy concern in a one-person office is mostly visual, not acoustic — the occupant isn’t running confidential calls all day. 30dB single-glazed handles “I’m focused, don’t interrupt me” perfectly. Save the budget for the boardroom.

2. Open-plan environments where ambient noise is already high

If your open office floor has a baseline ambient noise level of 50-55dB (coworking spaces, sales floors, customer service centers), the partition’s job is reducing speech intelligibility, not eliminating sound entirely. Single-glazed at 30dB drops conversations below the ambient threshold and you stop noticing them. Double-glazed adds no perceptible benefit here.

3. Mid-frequency conversations (most office talk)

Acoustic dB ratings are averaged across the speech spectrum. They work best at mid-frequency conversation (200-2000Hz). They under-perform at low-frequency rumble (bass voices, machinery) and over-perform at high-frequency squeak. For typical office conversation, the 30dB single-glazed rating is actually closer to 32-33dB effective — narrowing the practical gap with double-glazed to maybe 10-12dB instead of 15dB.

4. Spaces where occupants control conversation volume

Executive offices and boardrooms can self-regulate. If the meeting needs to be quiet, occupants lower their voices. If the topic is non-sensitive, normal volume is fine. For occupants with this discretion, single-glazed plus occupant awareness performs adequately. Where occupants can’t control volume — phone calls, video conferences, group brainstorming — double-glazed earns its premium.

Frequently Asked Questions