Lloyd Alter is Design Editor for Treehugger and teaches Sustainable Design at Ryerson University in Toronto. Alternating tread stairs are terrific for saving space; you only put one foot on a tread at ...
Not only can you possibly slip off the side and cut a gash in your face on these crazy tread stairs, you could slip and fall crotch first onto the middle bar. Very useful for keeping fatties off the ...
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