many types of stair and step configurations are possible , building a set of stairs. standard 2” tread is an economical and flexible material to create steps ,
double winder stairs. double winder stairs are stairs with a turn by 180 degrees. they are more compact than single winder stairs. in this type of staircases we can distinguish two varieties: smoother passage of winder treads from turn to turn, and more abrupt passage. stairs with smoother passage are more convenient but they occupy more space.
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