Secondary Glazing

Black Knight secondary glazing is available with a large variety of glass options.

4mm clear or obscure float

Standard secondary glazing configuration. Various obscure glass patterns are available for use in areas bathrooms where privacy is an issue. 

6mm clear or obscure float

Standard glass with slightly better noise insulation properties than 4mm glass.

4mm clear toughened & 6mm clear toughened

A safety glass approximately four times stronger than ordinary glass of the same thickness which will shatter safely upon severe impact. Must be used in all areas where safety is a consideration. See how to measure for further guidance.

Sandblasted & sandblasted toughened

An opaque effect glass giving total obscurity in the secondary glazing unit.

Pilkington K Low emissivity (LowE)

A heat reflecting glass with an invisible coating to reflect heat back into the room. 

6.4mm clear laminated

A Class B safety glass made up of 2 separate sheets of clear 3mm glass with an invisible PVB layer 0.4mm thick between them which will crack without shattering under impact. Provides good security against forced entry. 

6.8mm clear laminated

Class A safety glass made up of 2 separate sheets of clear 3mm glass with an invisible PVB layer 0.8mm thick between them which will crack without shattering under impact. Provides good security against forced entry. 

6.4mm Stadip Silence

Acoustic glass made up of 2 separate sheets of 3mm glass with an invisible interlayer membrance which dampens sound frequencies and acts as an effective barrier against noise transmission. This glass type is also a class B safety glass when used in seocndary glazing.

6.8mm Stadip Silence

Acoustic glass made up of 2 separate sheets of 3mm glass with an invisible interlayer membrance which dampens sound frequencies and acts as an effective barrier against noise transmission. This glass type is also a class A safety glass when used in secondary glazing.

It is a legal requirement that safety glass is used in areas where the possibility of injury might occur. The diagram below indicates the areas on secondary glazing where safety glass must be included - for further information please see how to measure

You can get noise reduction using secondary glazing in Broxtowe Chorlet North Kesteven