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We have foundations, bedrooms, and tall stone kitchen/fireplace built, as well as part of the living/dining room. As soon as the weather warms, we will tackle the big glass window wall that opens onto the terrace.
The technical question is this. Searching FLLW details and looking at many of his houses from this period, it appears that the window mullions were set right onto the concrete floor. Sometimes they were steel, clad in wood, but usually only wood, that is holding up the roof. It has been suggested that we make a steel bracket to support the mullion and transfer the load to the foundation, and hide it inside the concrete floor. Good idea and we will do it. But I would like to know from those who may be familiar with maintenance of the Usonians, how do they prevent rotting of the wood at this junction of wood and concrete?
Doug Kottum, Battle Lake, MN
about 2 inches tall. Also the french doors appear to have a taller
theshold than Wright typically used. I believe these changes were
made as part of the restoration to prevent water from wicking up
and damaging the wood. Particularly important in snow country.
The typical detail indeed was the sill, almost always a "bulkhead" type sill, sealant or gasket closing the gap betwwen the wood and the concrete pad. These window walls , which of course included operable panels, lead out to a hardscape terrace, sometimes elevated above grade, and usually protected by a generous overhang, but not always. Even near grade, the slab extended at least 6", but usually more, and sloped away from the building, to keep landscaping, soil, moisture at a distance.
On the Hanna House, Wright used a metal spline in the concrete. Interesting to me is Wrights' method for dealing with the desired long spans of window walls. If the wall was long and straight, vertical posts were used. The obtuse angles of the hex, eliminated the need for additional vertical support because, as I understand it, Wright thought the window and door frames, configured at 120 angle bays, acted as collectors to resist lateral load.
Looking forward to pics of your project, sounds like great fun!