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Message: [QUOTE="QuickDraw, post: 3578633, member: 10020"] do you know the spacing of the ceiling joists? they are both designed to fit between existing framing , either 16" oc or 24" oc (on center) so all you would be required to do is box out the 2 open ends instead of a much larger re-frame of the ceiling if you were to cut an existing joist to accommodate the width you will need sister the outer joists and box out the ends with joist hangers or risk compromising the soundness of the structure, this is much more involve and I would recommend avoiding. They install easily enough. The difference in cost has more to do with more material for stairs (aluminum) & the less frequent the ones for a 24"oc framing are sold and needed. [/QUOTE]