As rooflight and roof glazing specialists, we have a wealth of experience in supplying non-fragile rooflights.


In the UK, the recognised standard for non-fragility of overhead glazing is published by the Centre for Window and Cladding Technology (CWCT) with Technical Notes TN66 & TN67 defining the design and testing requirements.


The non-fragility requirement is one of the key factors when designing a glass rooflight or roof glazing project, as this has a major impact on the design solution and the selection of an appropriate glazing system.

Roofglaze can provide systems rated to all classifications including CWCT Class 1 with glass units up to 7.29m2.

For bespoke applications Roofglaze can undertake project specific non-fragility testing.




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