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 ...

With so many types and styles to choose from, the best stair treads can be difficult to narrow down. Of course, most top-selling sets are nonslip and nice to look at — but how do you find the ideal ...