Roofglaze can provide CWCT TN 66, CWCT TN 67 and CWCT TN 92, Class 1 and Class 2 compliant, non-fragile glass rooflight solutions on request. You can find out more about these measures of non-fragility on the CWCT website.
Please feel free to Contact Roofglaze to discuss your project requirements with our expert team.
The Red Book (ACR[M]001:2014) defines a test for non-fragility which can be applied to any polycarbonate roof assembly, intended to indicate whether or not the roof can support the instantaneous loads imposed on it by a person falling or stumbling on it. It is not a product test as such, but roofing products like rooflights can be tested as part of the roof assembly.
The test defines 3 Classes of non-fragility (A, B or C). Most roof constructions without rooflights are Class B or C (very few achieve Class A). Rooflights should generally match the performance of the roof (i.e. if the surrounding roof without rooflights achieves Class B, so should a roof assembly including rooflights). Roofglaze can provide non-fragile polycarbonate rooflights on request.
- Define the non-fragility classification required. Avoid use of terms such as ‘walk-able’ or ‘man-safe’ – these terms are undefined so can result in use of lower grade products.
- Request specific evidence for any non-fragility claims (a detailed test report, signed by a competent person, or compliance with GN2006/1) and ensure this covers the application/assembly in which the product is to be used; do not rely on general statements.
- For rooflights, the method of fixing is critical – always fix the rooflight as recommended and tested. A poorly installed rooflight is potentially as much of a hazard as a fragile product.
- Never wilfully walk on any rooflight. This will encourage dangerous practice as not all rooflights are made to be non-fragile and any foot traffic may damage the rooflight.
More details can be obtained from the ACR (Advisory Committee for Roofsafety), or from NARM (National Association of Rooflight Manufacturers).