stringers in stair construction |
Since we already know what stair stringers are and some of our staff have built stairs, the question made sense: what's the maximum spacing suggested between stringers in a stairway? Most references say that 2-by-8 or 2-by-10 lumber treads (such as one might find on a deck) should not have an unsupported span greater than two feet (some say 18 inches), so a third stringer is advisable in wider stairways.
That's not what McNally said, however. Mary said this:"Stair stringers should be made from 2-foot by-12 foot boards. These boards should be at least 5 inches thick to provide enough support. Ninety degree angles are marked on the boards where each stair will be located. The angles are then cut with a circular saw. The tread is attached to the horizontal surface of the angle, while the risers are attached to the vertical surface of the angle."Yep, that same moronic content editor – the one who wouldn't know a 2-by-12 if s/he tripped over one – has struck again! A "2-foot by-12 foot" board, by our calculation, would weigh more than 900 pounds per running foot! |
Even, however, if McNally's post had the correct dimensions – "stringers should be made from 2-by-12s" – it would be obvious that Mary had not idea what she was talking about. After all a 2-by-12 has a nominal thickness of two inches (finished thickness of 1½ inches), so where did that "at least 5 inches thick" come from?
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DDIY - STAIRS
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