You'll probably recognize this: you're in an important meeting, but you can effortlessly follow the literal words of your colleagues in the next room. Or vice versa: you're having a confidential conversation and you wonder if the entire department outside can eavesdrop. In the design of a modern office, sound insulation is not a luxury, but a prerequisite for your productivity. But what do those technical dB values in our product sheets really mean for your daily work?

In the world of partition walls, decibels (dB) are often thrown around. In System Flex specifications, you'll see values ranging from 38 dB to as much as 47 dB. To make the right choice for your project, it's essential to understand how this scale works and which wall suits which function.

The logic of the decibel: Every 3 dB is a doubling

Before we delve deeper into the different wall systems, it's good to understand a basic principle of sound. The decibel scale is logarithmic. This means that an increase of 3 dB in practice means a doubling of sound insulation. A wall that scores 41 dB therefore blocks twice as much sound as a 38 dB wall.

When we look at office design, we distinguish between sound reduction (how much sound is blocked) and acoustics (how the room sounds). In this article, we focus on the insulation value: the barrier that prevents sound from leaking from room A to room B.

The practical ladder: From basic comfort to absolute privacy

Based on our wall sheets, you can establish a clear ladder of sound comfort in the workplace:

• 38 dB – Basic comfort with the Flex Qube and Flex Solid: Muted conversations are still audible, but no longer literally intelligible. Ideal for canteens or general areas where absolute confidentiality is not a priority.
• 40 dB – The standard for privacy with the Flex Magnet: Normal volume speech becomes unintelligible. The 45 mm glass wool core provides the quiet needed in a modern workplace.
• 42 to 47 dB – Superior insulation with the Flex Light Deluxe: Even loud conversations are completely filtered out. The double glass construction and a 76 mm air gap create visual openness with maximum auditory insulation.

The weakest link: Why the door determines your dB value

A common mistake in office renovation is investing in a high-quality 47 dB wall, only to then install a standard door. Sound behaves like water: it seeks the smallest opening. A wall is only as strong as its weakest link.

In our documentation on solid HPL doors, you will therefore see the mention of the Deventer 42dB sealing rubber. A door without a good drop seal or quality rubber immediately reduces the total insulation value of your wall by 5 to 10 dB. At System Flex, we always recommend fully matching the door set to the wall value for the best result.

Acoustic optimization: Details that make the difference

In addition to wall selection, there are small technical interventions that affect your dB performance. Think of the PE sealing tapes we apply as standard between the profiles and the structural parts. This prevents 'sound leaks' at the connection to floors or ceilings.

For those who want to get the most out of the Flex Light Deluxe, we offer an extra acoustic upgrade. By sealing the seams with grey-transparent sealant, you ensure an airtight seal that elevates the insulation value to an even higher level. As recently discussed in the Facility Journal, integral safety - and thus auditory privacy - is increasingly becoming a cornerstone of office design.

How do you choose the right dB value for your office?

It's tempting to go for the highest value everywhere, but that's not always necessary. Look critically at the function of the space. An executive office requires the 47 dB of the Deluxe series, while a transparent partition in a corridor often already benefits from the 38 dB of the Flex Qube. By smart zoning, you save costs without compromising on comfort.