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These surviving ca. 1812 joists were important because they allowed the architects to produce an incredibly accurate design for the wing's reconstructed terras roofs.  Specifically the ca. 1812 joists provided the architects with the sizes of the joists, exactly how steeply the roof sloped towards the eaves, and the angle to set the sheathing boards that created the series of peaks and valleys that define a terras roof.


Restoration carpenters Les Lamois and Mark Gooch installing the North Wing's reconstructed roof joists.