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Mr Wright spoke of the Usonian Automatic system in his 1954 "The Natural House," using illustrations of the earlier Textile Block and later Usonian Automatic block construction in the same short chapter. He did not mention the name Textile Block at this late date, when his few Usonian Automatic houses were in design and being built. So, the Pappas house should not be referred to as "Textile Block"---even though the construction of both versions of the technique and system are similar, differing mainly in the shape and decoration of the concrete unit. In the postwar period, "Usonian Automatic" was the name Wright wished to use for these new houses.
Unfortunately, system failure is inevitable because of oxidation, especially in the northern climates.
I looked at the earliest built Usonian Automatics, thinking that one or both might have been made or at least drawn with a double-wythe wall. In covering the Arthur Pieper house (1952, S.349) Storrer writes that "two three-inch-thick walls, as in earlier Wright textile block designs" was considered, but that "only one thickness of block was completed." The plan of Benjamin Adelman (1951 per Storrer; drawn earlier than Pieper but built later), as reproduced in Monograph 8, p 15, appears at first glance to indicate a double wall---but on closer inspection a note indicates the same sort of interior finish as is seen in the Tracy drawings: furring strips bolted to the inside of the concrete exterior walls, with 3/8" ribbon-stripe Philippine mahogany plywood nailed and glued to the furring.
In addition to those few Usonian Automatic houses built in the 'fifties, I count sixteen more that were presented to clients but not built.
Answer: Millard was conceived of and built as a concrete-block building. In some places decorative block is wired to wood structure. Only after construction was underway did Wright come up with the Textile Block system.
See Sweeney, "Wright in Hollywood," pp 27-42.
"The working drawings were completed by Lloyd Wright. They reveal a hybrid of concrete block and standard structural components, but are remarkably inconclusive about specific details of the block system itself. Concrete block is indicated primarily for load-bearing perimeter walls. Interior partitions are wooden studs and plaster; floors are concrete scored to match the block joints, or wood; and ceilings are exposed-frame redwood or plaster. A skeletal concrete frame carries some of the loads. When the blocks are used horizontally as trim on balconies, they are wired to the substructure. The pierced-block screen in the upper west wall of the living room is supported by a concrete beam."
(Zoom your page to inspect drawings)
© 1994, Robert L Sweeney
(The same drawing also shows the original extent of the lot, with only the NE corner touching Prospect Crescent, necessitating the right of way allowing the original single-car garage to be built on the neighboring property -- which, after the house on it burned, was acquired by Millard sometime after Lloyd built the studio in 1926, which has its back side adjacent to the lot line. This addition allowed room for the second stall of the garage to be built. It was on this lot that Millard intended to have FLW build some rental units.)
". . .although the information it provides is incomplete, it does reveal the evolution that has occurred. The interlocking blocks used
in the Millard house are contrasted with the new blocks, which are cast with semicircular channels around their perimeters . . ."
Having gone thus far into the story of La Miniatura from Sweeney's account, I might as well present the remainder of his chapter, "The Block System Emerges":
© 1994 by Robert L Sweeney, by the Architectural History Foundation, and by the Massachusetts Institute of Technology
One wonders if, when Mr Wright was readying the final version of this block system for its rebirth as the Usonian Automatic, he might have recalled contractor Parlee's contention, thirty years earlier, that Parlee hadn't been aware of the double-block wall which he then "claimed as an extra" to his costs . . .
http://wrightchat.savewright.org/viewto ... lit=Pieper
The cross section of a single wythe wall is visible.