COD,
> It's possible since they are so odd that they were somebody's stupid bright idea and do not serve any real purpose, taking care of some imagined problem, but you never know.
>   
That was my first thought but it seems to obvious to be true.
> Anybody like Ralph got a 1950s-era Architectural Graphic Standards laying around that can be looked at to see if it has a standard detail for this?
>   
Ralph is looking for it in his mailbox along with the dues checks.
> Would Tom Jester's Twentieth Century Building Materials book shed any clues?
>   
I could ask or look it up but kind of doubt it would cover this.
> Let no serious question go unanswered, even if it is a useless answer. Seriously useless.
Not useless. Seriously helping me to envision what they may have intended.

][<en

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