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so the span is exactly 20' 9". I figured the joists cannot be the TJI-110's as they don't make them in 16". So the the 210 is worst case scenario joist, and that comes up as 22' at ~L/480 with 19.2" spacing.
Coming to realize my slate dreams may be shattered, looking into a ceramic or porcelain tile, which should work at L/480. Looking at 'fake' slate, but I just hate the fact that they print 4 patterns for each type of tile, and your floor will look like a bad photoshop collage inkjet printed stone tiles!
Any recommendations on a good slate knock off?
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