Butt Joined Glass Silicon Joint Size

Is there a minium/maximum width for silicon joint in butt jointed glass ??

Project glass support steelwork has theoretical mid span deflection of 21mm over 9000mm span after the glass is installed (ie: due to live loads)and floor is occupied. If we use standard 6-10mm joints then there is a danger that the glass joint will pinch at top of joint. Any ideas to deal with the this potential issue ?


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