Sound Insulation of Windows

**Sound Insulation of Windows**
Single/ Double Window	Type of Window	Type of Glass	Sound Reduction (dB)
Single	Opening type (closed)	Any glass	18-20
	Fixed or opening type with air-tight weather strips	24/32 oz sheet glass	23-25
	Fixed or opening type with air-tight weather strips	6 mm polished plate glass	27
Single	Fixed or opening type with air-tight weather strips	9 mm polished plate glass	30
Double	Opening type (closed) plus absorbent material on sides of air space	24/32 oz sheet glass 100 mm space	28
		24/32 oz sheet glass 200 mm space	31
		6 mm polished plate glass 100 mm space	30
		6 mm polished plate glass 200 mm space	33
Double	Fixed or opening type with air-tight weather strips	24/32 oz sheet glass 100 mm space	34
		24/32 oz sheet glass 200 mm space	40
		6 mm polished plate glass 100 mm space	38
		6 mm polished plate glass 200 mm space	44