Frameless glass partitions: sound insulation, dB and prices

Why acoustics matter

A glass partition in an office or apartment shouldn't just look good — it has to contain conversations. A great-looking design without acoustics leads to disappointment within weeks: the conference room won't shield meetings from echo, the bedroom wall won't dampen the TV. Acoustic quality is measured by the Rw value (weighted sound insulation, dB) — the higher the number, the better.

How many dB your space needs

• Open office / cafe: 30-35 dB is enough (acoustic comfort, not full isolation)
• Private office / meeting room: 38-42 dB
• Boardroom, law firm, therapy room: 45 dB+
• Bedroom adjoining the living room: min. 38 dB (for comparison: a standard interior wall ~35 dB)

Glass build-ups and real dB values

Single-pane 8 mm tempered

A standard frameless partition, the most popular choice for an open office. Acoustics: Rw ≈ 32 dB. Price: €80-110/m². Suitable when privacy isn't critical.

10-12 mm tempered

Thicker glass adds about 2-3 dB. Acoustics: Rw 34-36 dB. Price: €110-140/m². Practically a small step — better to move up to VSG.

VSG laminated with an acoustic interlayer

Two glass layers bonded with an acoustic PVB film (e.g. Saflex Q, Trosifol SC). This film better dampens mid-frequency sounds (speech). Acoustics: Rw 38-42 dB (depending on thickness). Price: €140-180/m². The best price/acoustics ratio.

Double-glazed unit (two panes + air gap)

Two separate glass panels with an 80-120 mm air gap (often each side held separately in a profile or in the floor). Acoustics: Rw up to 48 dB. Price: €200-250/m². Requires a wider floor/ceiling junction (~15 cm thick).

Acoustic weak points

Even great glass won't help if everything around it leaks sound. Common mistakes:

• Open gap between the partition and the ceiling/floor — even a 5 mm gap can drop real insulation by 8-10 dB. Use an acoustic silicone sealant.
• Glass doors without seals — a door gap nullifies the panel's acoustics. You need a magnetic seal plus a drop-down seal at the bottom.
• Ceiling plenum — if a suspended ceiling runs above the partition, sound travels above it. Solve this with acoustic infill above the partition up to the slab.

FAQ

What's the difference between Rw and Rw+C, Ctr?

Rw is insulation against standard noise (speech). Rw+C is the speech correction (typically -1 to -2 dB). Rw+Ctr is the low-frequency correction (traffic noise, music) and can subtract -5 to -8 dB. For offices Rw+C matters; for the external walls of homes — Rw+Ctr.

Does frosted glass insulate better?

No. The frosted finish (sandblasting, film) is a surface treatment and has no effect on acoustics. Sound insulation is determined by glass thickness, layers and gaps.

Can the actual result be tested?

Yes — acoustic measurements per LST EN ISO 10140 are performed at acoustic laboratories. For commercial premises (law firms, training centres) this is often commissioned as part of the project.