Technical Support


August 2016 No. 16

Its newsletter time again! This month I am concentrating on safety glass. The first part of the newsletter is all about the legal requirements within the building regulations but rather than just turn out the same old info the second part has been written to help explain the different types and their uses.

Approved Document K – Protection from Falling, Collision and Impact


K4 – Glazing with which people are likely to come into contact while in passage in or about the building shall:

a) If broken on impact, break in a way which is unlikely to cause injury; or

b) Resist impact without breaking; or

c) Be shielded or protected from impact.

The approved document gives guidance on the new requirement for glazing that is located:

a) Between floor level and 800mm above that level in internal walls

b) Between floor level and 1500mm above that level in a door, or in a side panel with 300mm of the door.

*Diagram reference, Approved Document K – Protection from falling, collision and impact – Chapter K4 – Section 5 – page 31. Can be accessed via Please visit for full information.*

The risks associated with glass can be reduced if the glass in the critical locations is:

1) Laminated glass – Laminated glass will break in the same way as the individual glasses that make up the laminate, but the cracked glass will continue to adhere to the plastics interlayer

2) Toughened (tempered) glass – Thermally toughened glass is comparatively difficult to break. If broken it will fragment into very small comparatively harmless pieces. This reduces the likelihood of the glass breaking in a dangerous way, but does not remove the risk entirely.

3) Glazed in small panes – Either as a single small pane or a series of panes.

4) Given permanent screen protection – So that the glazing is installed behind a protective screen.

This screen should:

a) Prevent a sphere 75mm coming into contact with the glazing;

b) Be robust and

c) Be difficult to climb.

Glazing that is afforded permanent screen protection, does not itself, need to comply with the requirement.

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Secured by Design

The windows and doors we supply and install, all have ‘Secure By Design’ which is a police security initiative; featuring locking mechanisms & key lockable handles. The doors have multi-point locking that includes hook and shoot bolts for maximum security, which conforms to PAS 23/24, an enhanced security design. This security aspect ensures that the locking cylinder is kite marked and has passed two lock snapping tests. Our composite doors are also ‘Secure By Design’ & PAS 23/24.


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