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Country Estate - 20 acres with over 6400 square foot home and Barn in La Honda, CA 94020 - [7:28]
Yes, there is a "flying roof" above the center of the plan. A latter-day section drawing found in the Hannas' book is the only image I have of that detail:
Perhaps the reason that the composite beam didn't deflect is that its members were increased from 2x10s to 2x16s ?
Or it may be that the beam in question was not the one shown in the section drawing. Note that Wright assumes that fixed sash would carry
part of the weight. I suppose that it could, if properly shimmed; the stiles are slender posts in a pinch ? "Heavy telegraph wire" and 1 3/4" pipe . . .
and (presumably) twisting and soldering it to itself. One method of tensioning the wire (he proposes crowning the beam upward by 3/4" at center !) might be to pull
it upward at the center and pin it there, making the wire into a flat W.
His truss really lifts the beam only at the points where it passes beneath the two mid-span pipes. Perhaps those pipes should be much nearer the center ? Then
tensioning would take place as suggested, but at the quarter points of the span . . .