Soundproofing with Secondary Glazing
Cut up to 80% of external noise — over 50 decibels — using acoustic laminated glass and a wide sealed air-gap.
Why it outperforms double glazing
The bigger the air-gap between two panes, the more energy the air absorbs before sound reaches the room. A sealed 20mm double-glazed unit can't compete with a 100–200mm secondary glazing cavity — this is basic acoustics.
- 100–200mm cavity vs 20mm DGU
- Up to 5× the acoustic performance
- Absorbs mid- and low-frequency noise
- Independently tested to BS EN ISO 10140
The right glass matters
Standard 4mm glass will reduce noise, but 6.4mm or 6.8mm acoustic laminated with an interlayer is the specification that delivers the headline 80% reduction. We spec this as standard on any window facing a busy road, railway or flight path.
Real-world results
Traffic drops from intrusive to background hum. Barking dogs and voices no longer wake you. Hotel guests sleep on the main-road side of the building.
- Traffic and road noise
- Aircraft and rail
- Pubs, nightlife and voices
- Building sites and plant noise
Ready for a free, no-obligation quote?
South Yorkshire's specialists in secondary glazing — survey, measure, manufacture and install.