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TN66 categorises glazed roofing using what classes?
The most common interlayer used in laminated glass is what?
In a domestic situation, NARM guidance on load capacities for walk-on rooflights suggests a uniformly distributed load (kN/m²) of up to what?
How heavy is the steel ball used in a “hard body test”?
How much stronger than annealed glass is heat-strengthened laminated glass?