ONLINE VERSIONProtection against impact with glazingK4Permanent screen protection5.8 If glazing in a critical location is protected by a permanent screen then the glazing itself does not need to comply with requirement K4. The permanent screen should comply with all of the following.a. Prevent a sphere of 75mm from coming into contact with the glazing. b. Be robust.c. If it protects glazing installed to help prevent people from falling, be difficult to climb (e.g. no horizontal rails). See Diagram 5.4. See para 5.8 <75mmglass<75mm800mmfrom?oor<75mmlevelSection detail of screenLess than 75mmLess than 75mmDiagram 5.4 Permanent screen protection34 t K, 2013 edition t K, 2013 edition t K, 2013 edition Approved Document K, 2013 edition Building Regulations 2010ONLINE VERSIONONLINE VERSIONONLINE VERSION