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Why does a stair tread require a nosing...lets say the tread meets code for run requirements. why is a nosing usually put on---is it mainly for aesthetics...I'm just curious about the history of stair building...
Yes,it's probably for esthetics. Stair treds would look unfinished without the nosing. You could call it the molding for treads, I guess. If you're really interested in researching the history of stairbuilding, I'd suggest you start using Google on the web. It should get you enough to read for a while.
it has to be for aesthetics. i thought about it for a few minutes and thought, maybe it has something to do with safety, so you don't catch the front of your shoe on the edge, so that if you fall down a flight of stairs it doesn't injure you as bad, but then i started thinking about brick stairs, granite stairs, metal stairs, they all have sharp edges and if you fall on those you'd be alot more sore then falling down a flight of wooden stairs in a house (i happen to be an expert in that field so you can rest assured that the harder the stairs, the more painful the fall). so the only other thing i can think of besides aesthetics is that if the edge of the wooden stair was sharp, there's a much greater possibility of damaging the step and splintering the wood than if it was rounded over. i hope that helps you out a little, at least.