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what is the recommended gauge for external staircase MS railings? 14 or 16 gauge?

Hi,
16 gauge is sufficient if the design has close spacing ,like vertical support at every 3' max and horizontal support at every 1' - 9" .
14 gauge is required if you plan for very open type railing like glass / wood fixing .
For regular type railings 16 gauge is sufficient .

Regards
Ar.Praveen.N
Ardes Architects and Interior Designers
ardesarchitects@gmail.com
www.ardesarchitects.com

thanks praveen.

is there any recommendation on the diameter of the top horizontal rod of a staircase railing as well? like 40mm or 50mm etc?