Reduce outside noise levels for a more peaceful interior

Introduction to quieter

In this ever changing fast paced world, it is hard to sit and enjoy peace and quiet. Many of the buildings we use for living, studying, working and socialising were built many years ago to standards of their time, but are now unsuited to the demands of life today. So how do we relax when we encounter noise from heavy traffic, aircraft, noisy pubs and clubs or even noisy neighbours. By using the right combination of Selectaglaze secondary glazing to block out the disturbances, you can create comfortable environments to concentrate, enable a peaceful night’s sleep, relax and raise your quality of life.

Quieter

Benefits of secondary glazing for noise insulation

  • Creates a quieter environment
  • Reduces sleep disturbance
  • Meets noise planning constraints
  • Aids increased concentration and productivity
  • Protects hearing
  • Keeps annoyance and stress levels low

Guidance and regulations

Noise: Sound is measured as a pressure and expressed in dB (decibels), where to the human ear a change of 3dB is just about noticeable. An increase in pressure levels to 10dB approximates to a doubling of loudness.

UK Guidelines include:

  • BS 8233:1999 ‘sound insulation and noise reduction for buildings’
  • Planning and Policy Guidance 24: planning and noise
  • Building Bulletin 93: Acoustic design in schools
  • The WHO (World Health Organisation) 'Guidelines for Community noise' revised 1999 provides recommendations for inclusion in national guidelines

Reasonable noise levels at a glance:

Room Noise level
Bedrooms 30 - 35 dB
Music rooms 30 - 35 dB
Living rooms 30 - 40 dB
Classrooms/meeting rooms 35 - 40 dB
Libraries 35 - 40 dB
Open offices 45 - 50 dB

Effect of glass

Thicker glass has greater mass and will provide better performance. Acoustic laminate glass will show further improvements particularly at higher frequencies as it provides further dampening. Ideally the secondary glazing should have a different thickness of glass to the primary window to avoid sympathetic resonance which will increase noise transmission.

Effect of cavity

The cavity is the space between the existing primary window and the secondary window. A larger cavity will make a significant difference to the level of noise insulation.  

Acoustic performance of windows

Effect of cavity

Acoustic performance

 

Rw dB values for Selectaglaze secondary glazing systems

These figures are based on testing to Standard BSEN ISO 140-3:1995 ‘Laboratory measurement of air-borne sound insulation of building elements’ (click tables for full view)

Rw dB values for Selectaglaze secondary glazing systems with a 50mm cavity

 Glazing 4mm toughened glass 4mm glass 6mm 6.4mm 6.4mm stadip glass 6.8mm 6.8mm stadip glass 7.5mm 8mm 8.8mm 8.8mm stadip glass 9.5mm 10mm 10.8mm stadip glass 10.8mm 11.5mm 12mm
S10 HS 39 39 39 39 40 40 40 - - - - - - - - - -
S20 VS 39 39 39 39 40 40 40 - - - - - - - - - -
S30 LO 38 38 38 38 39 39 39 - - - - - - - - - -
S41 SHC 41 41 41 41 42 42 42 42 43 43 43 43 43 44 44 44 44
S41 DSH 39 39 39 39 40 40 40 40 41 41 41 41 41 42 42 42 42
S40 FL 41 41 41 41 42 42 42 42 43 43 43 43 43 44 44 44 44
S45 SHC 41 41 41 41 42 42 42 - 43 - - - - - - - -
S45 DSH 39 39 39 39 40 40 40 - 41 - - - - - - - -
S46 FL - - 41 - - - - - - - - 43 - - - 44 -
S50 SHC - - 40 - - - - 41 - - 42 42 - 43 43 43 -
S55 DFL - - - - - - - 40 - - - 41 - - - 42 -
S60 TVS 40 40 40 40 41 41 41 - 42 - - - - - - - -
S80 HS - - 40 40 41 41 41 41 41 41 41 41 41 43 43 43 43
S85 HS - - - - - - - - - - - 41 - - - 42 -
S90 VS - - 40 40 41 41 41 40 42 42 42 42 42 42 42 43 42
S95 VS - - - - - - - 40 - - - 41 - - - 42 -

Rw dB values for Selectaglaze secondary glazing systems with a 100mm cavity

 Glazing 4mm toughened glass 4mm glass 6mm 6.4mm 6.4mm stadip glass 6.8mm 6.8mm stadip glass 7.5mm 8mm 8.8mm 8.8mm stadip glass 9.5mm 10mm 10.8mm stadip glass 10.8mm 11.5mm 12mm
S10 HS 43 43 43 43 44 44 44 - - - - - - - - - -
S20 VS 43 43 43 43 44 44 44 - - - - - - - - - -
S30 LO 42 42 42 42 43 43 43 - - - - - - - - - -
S41 SHC 45 45 45 45 46 46 46 46 47 47 47 47 47 48 48 48 48
S41 DSH 43 43 43 43 44 44 44 44 45 45 45 45 45 46 46 46 46
S40 FL 45 45 45 45 46 46 46 46 47 47 47 47 47 48 48 48 48
S45 SHC 45 45 45 45 46 46 46 - 47 - - - - - - - -
S45 DSH 43 43 43 43 44 44 44 - 45 - - - - - - - -
S46 FL - - 45 - - - - - - - - 47 - - - 48 -
S50 SHC - - 44 - - - - 45 - - 46 46 - 47 47 47 -
S55 DFL - - - - - - - 44 - - - 45 - - - 46 -
S60 TVS 44 44 44 44 45 45 45 - 46 - - - - - - - -
S80 HS - - 44 44 45 45 45 45 46 46 46 46 46 47 47 47 46
S85 HS - - - - - - - - - - - 45 - - - 46 -
S90 VS - - 44 44 45 45 45 44 46 46 46 46 46 46 46 47 46
S95 VS - - - - - - - 44 - - - 45 - - - 46 -

Rw dB values for Selectaglaze secondary glazing systems with a 150mm cavity

 Glazing 4mm toughened glass 4mm glass 6mm 6.4mm 6.4mm stadip glass 6.8mm 6.8mm stadip glass 7.5mm 8mm 8.8mm 8.8mm stadip glass 9.5mm 10mm 10.8mm stadip glass 10.8mm 11.5mm 12mm
S10 HS 45 45 45 45 46 46 46 - - - - - - - - - -
S20 VS 45 45 45 45 46 46 46 - - - - - - - - - -
S30 LO 44 44 44 44 45 45 45 - - - - - - - - - -
S41 SHC 47 47 47 47 48 48 48 48 49 49 49 49 49 50 50 50 50
S41 DSH 45 45 45 45 46 46 46 46 47 47 47 47 47 48 48 48 48
S40 FL 47 47 47 47 48 48 48 48 49 49 49 49 49 50 50 50 50
S45 SHC 47 47 47 47 48 48 48 - 49 - - - - - - - -
S45 DSH 45 45 45 45 46 46 46 - 47 - - - - - - - -
S46 FL - - 47 - - - - - - - - 49 - - - 50 -
S50 SHC - - 46 - - - - 47 - - 48 48 - 49 49 49 -
S55 DFL - - - - - - - 46 - - - 47 - - - 48 -
S60 TVS 46 46 46 46 47 47 47 - 48 - - - - - - - -
S80 HS - - 46 46 47 47 47 47 48 48 48 48 48 49 49 49 49
S85 HS - - - - - - - - - - - 47 - - - 48 -
S90 VS - - 46 46 47 47 47 46 48 48 48 48 48 48 48 49 48
S95 VS - - - - - - - 46 - - - 47 - - - 48

Rw dB values for Selectaglaze secondary glazing systems with a 200mm cavity

 Glazing 4mm toughened glass 4mm glass 6mm 6.4mm 6.4mm stadip glass 6.8mm 6.8mm stadip glass 7.5mm 8mm 8.8mm 8.8mm stadip glass 9.5mm 10mm 10.8mm stadip glass 10.8mm 11.5mm 12mm
S10 HS 45 45 45 45 46 46 46 - - - - - - - - - -
S20 VS 45 45 45 45 46 46 46 - - - - - - - - - -
S30 LO 44 44 44 44 45 45 45 - - - - - - - - - -
S41 SHC 47 47 47 47 48 48 48 48 49 49 49 49 49 50 50 50 50
S41 DSH 45 45 45 45 46 46 46 46 47 47 47 47 47 48 48 48 48
S40 FL 47 47 47 47 48 48 48 48 49 49 49 49 49 50 50 50 50
S45 SHC 47 47 47 47 48 48 48 - 49 - - - - - - - -
S45 DSH 45 45 45 45 46 46 46 - 47 - - - - - - - -
S46 FL - - 47 - - - - - - - - 49 - - - 50 -
S50 SHC - - 46 - - - - 47 - - 48 48 - 49 49 49 -
S55 DFL - - - - - - - 46 - - - 47 - - - 48 -
S60 TVS 46 46 46 46 47 47 47 - 48 - - - - - - - -
S80 HS - - 46 46 47 47 47 47 48 48 48 48 48 49 49 49 49
S85 HS - - - - - - - - - - - 47 - - - 48 -
S90 VS - - 46 46 47 47 47 46 48 48 48 48 48 48 48 49 48
S95 VS - - - - - - - 46 - - - 47 - - - 48