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like what you are talking about with glue and OSB.
Yet somewhere along the line I picked up the idea that they were glued along their edges as if "laminated"
I'll look into it. Maybe, from the start, they did what you describe.
Scabbing with nailed or screwed plywood would be a useful and perhaps superior alternative, and one more easily achieved.
I make increasing use of polyurethane glue (i.e., Gorilla Glue, etc) in exterior work.
Terminology employed on Taliesin drawings varies from sheet to sheet, and over time. The euphemisms for "kitchen" are but one notable example; I've spotted many other alternates within the accepted trade vocabulary, on Taliesin construction drawings.
Nothing on the construction of the 3 "superimposed" roof beams
but did find this:
"In the Schwartz house .... Tafel protested to Wright that there was insufficient structure at the 30ft span intersection of upper and lower roofs, which at that point were separated by continuous clerestory windows.
Wright asserted that one cantilever roof would hold up the other (also in cantilever).
Without permission, Tafel substituted steelwork for the timber specified, putting in a large I-section in the upper roof
with steel rods suspending the lower beam below. To this he added steel flitch plates.
He also substituted 2X4's for the plywood specified in the core of the ground floor bedroom, since both he and the client
felt that the severe winter climate of Northern Lake Michigan demanded greater insulation."
I gues this is what RG was talking about in mentioning how Tafel was fired.
Upper roof framing was never cantilevered unless some of the beams were anchored
and tied down into the fireplace masonry.
... and I don't think that is that case or was ever planned.
I Googled "stitchnailing" and was rewarded only with this document, which contains the term---somewhere.
https://tolko.com/wp-content/uploads/20 ... Canada.pdf
In looking at the Schwartz drawings ( july 1939) where the word is used - it seems to be in context of a plan, and as a note for the timber joists - either floor or roof (rafters) and only on the 2 x 4 built up joists.
I'm just wondering if it refers to the stacking of the 2 x4's or the laping/layering of the joists over the steel beam.
on an earlier drawing 3904.13 - sheet 3 upper floor plan And roof plan, the UF bedroom roof framing plan says - 3- 2 x 4 laminated 2'4" oc
on an early section drawing - a note also says 3- 2 x 4 laminated 2'4" oc
it has a note saying spray 0-flake
and points to a squiggly line of an internal fascia above the glass doors -
this I interpret to mean "spray some insulation gunk to the interior framing of the trellis"
Additional insulation perhaps? which make sense in like of the comments a few days ago that E. Tafel made the GF timber walls thicker for increased insulation.
hmm. this reminds me of how the balcony in the Jacobs 2 house is supported.
The rod must be in a clerestorey window jamb -wonder which one. I also wonder where the end of this steel beam is supported - we have a full height brick wall at one end, but at the other ? air!!!