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If you see that the treads are what is giving and not the blocks supporting the treads, as isherwood says, there is no need for a center support, precisely for the reason he stated. Many stairs are built without center supports. When I have my preference as to how I want to build stairs, this sketch illustrates my joining method. All tongues and grooves ...


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That structure is adequate for a couple reasons: The risers carry most of the load. They act as beams and support the front of the tread, where most of the weight lies. 34" is a fairly short span by modern standards. You can't even build stairs narrower than about 42" these days and meet code. Those treads are really strong. Breaking an oak board like ...


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Drainage will keep the water away from the backside. Vertical concrete walls are common but require reinforcing (due to tension forces) and an adequate footing that resists both overturning and sliding. Typically, non-reinforced walls, like the rock wall that you want to do, are often sloped slightly backward. They resist the soil simply through dead weight ...


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