Originally posted by Wickerman
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Hmm. This diagram of a mansard roof has the joists running perpendicular to the apex of the roof. I'd also read that the joists rest on the two strongest walls, in the case of number 26, the front and back walls. The joists need to rest on the strongest walls in the structure. The side walls are thinner, "party" walls. Thinner, because they are partly strengthened by the shared walls of neighbouring properties.
I'd followed the long examination of the Eliza Roberts' testimony and its clues to the layout of the first floor. And also seen that RobertH was modelling it all. But because I was, and am again, attempting to model the house myself, I didn't want to be influenced by Richard's decisions and decided to figure out the same mysteries from an independent perspective.
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