Space requirements: For spirals coming up through a stairwell keep in mind the stairwell size required for the spiral you want. These sizes are usually given as "finished" dimensions. We will need to take into account the size of the stairwell rough opening as well as the thickness of the material (drywall, paneling, etc.) that will cover the top floor framing (figure 10).
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Precision Pine, Inc.,
7322 Hodges Ferry Road,