We post photographs & descriptions of unidentified objects, components, systems, materials in buildings, inviting reader comments to help us track down the history or origin and use of unfamiliar things we find in, on, or around buildings.
What do you suppose is the origin or was the purpose of these roof sheathing boards perforated at regular intervals and mostly equipped with ceramic bushings.
Contributed by home inspector David Grudzinski we illustrate and discuss these boards at
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