NARM, the National Association of Rooflight Manufacturers, has published an updated version of its Quickguide 08. It is entitled ‘Understanding CWCT Classifications of Rooflight Types’.
The CWCT (Centre for Window & Cladding Technology) tests for non-fragility comprise of soft body and hard body impact tests as well as a load retention test.
They are intended to identify what glass size and type of rooflight can be deemed safe for anyone that might be working on or adjacent to the glass from outside as well as protect anyone that may be below the glass.
There are four classifications assigned by the CWCT standards, these are classes 0, 1, 2 & 3. Simple descriptions of the classifications and applications relevant to them are provided in the document.
Stuart Middle, NARM’s Technical Committee Chairman, comments: “Recent developments in glass rooflight design, including the rise in popularity of so-called ‘walk-on’ rooflights, have led to a degree of confusion around their specification.
“This document has been produced to provide a quick overview to help specifiers avoid potentially dangerous mistakes.”
NARM Quickguide 08 is available from the NARM website. This also hosts a wide range of other technical documents covering different aspects of rooflight specification.
Download a free copy of the document here
For further information, visit www.narm.org.uk
For further information, please contact NARM using the contact details on our website, where you will be directed to the appropriate person.
Click here to visit The Rooflight Association's website
InstallerSHOW and the British Institute of Kitchen, Bedroom and Bathroom Installation (BiKBBI) have announced a new partnership which will see the institute’s annual awards and one-day conference take place at the NEC in June 2026 and beyond.
Posted in Articles, Bathrooms & Toilets, Bathrooms, Bedrooms & Washrooms, Building Associations & Institutes, Building Industry Events, Building Industry News, Building Products & Structures, Building Services, Drainage, Exhibitions and Conferences, Innovations & New Products, Interior Design & Construction, Interiors, Kitchens, Pipes & Fittings, Plumbing, Posts, Restoration & Refurbishment, Retrofit & RenovationThe winners of the second Steel Window Association (SWA) Awards have been announced at a ceremony in County Hall, London.
Posted in Articles, Awards, Building Associations & Institutes, Building Industry Events, Building Industry News, Building Products & Structures, Building Systems, Doors, Exhibitions and Conferences, Glass, Glazing, Posts, Restoration & Refurbishment, Retrofit & Renovation, Steel and Structural Frames, Walls, WindowsThe latest CIBSE-approved CPD from Ideal Heating Commercial – the UK’s market leader of high efficiency commercial heating solutions – is focussed firmly on the modern plant room.
Posted in Articles, Building Industry Events, Building Industry News, Building Products & Structures, Building Services, Continuing Professional Development (CPD's), Facility Management & Building Services, Heating Systems, Controls and Management, Heating, Ventilation and Air Conditioning - HVAC, Innovations & New Products, Pipes & Fittings, Plumbing, Posts, Retrofit & Renovation, Seminars, Sustainability & Energy Efficiency, TrainingSenior Architectural Systems has supplied a high-performance aluminium fenestration package as part of the major redevelopment of Monkwearmouth Hospital in Sunderland.
Posted in Aluminium Products, Articles, Building Industry News, Building Products & Structures, Building Systems, Case Studies, Curtain Walling, Doors, Glass, Glazing, Posts, Restoration & Refurbishment, Retrofit & Renovation, Sustainability & Energy Efficiency, Walls, Windows