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If you go back to the early 1900s, the cladding was installed on a diagonal, which helped greatly in preventing the building from racking. Now we rely on sheet rock and plywood to provide that protection in earthquakes and wind storms.

If you ever see a house stripped down to the sticks for a rebuild, you will hopefully notice a few braces added. Not to keep the walls from falling down, but to keep them square and true until the walls are rebuilt.



For what it's worth, in the Boston area traditional sheathing is boards parallel to the ground, not diagonal.

(I've seen dozens of houses from ~1900-1920 in the process of full gut rebuilds, and none of them had diagonally installed sheathing.)


It might be more of a commercial building thing than a domestic construction one. I know I've seen it in a number of videos of renovations of larger buildings, including barns. I might have the time range off. Big cities are full of 1920's constructions especially on the West Coast, and they don't do that.

My old house (~1920) had diagonal shiplap under the floors instead of plywood (but parallel in the oldest walls). That's probably more for making hardwood floors easier to install than structural integrity.

Edit: The internet says 'start of the 20th century' phased out in 1950's (plywood), and 'sometimes diagonally'.


The subfloors I've seen for old houses in Boston are also laid perpendicular to the joists, though diagonal does seem like it would make more sense.


Laying a board over a seam in the subfloor sounds like a titanic pain in the ass. Diagonal means you might have to move the nail a little. Probably also limits the amount of dust and water that passes through from floor to ceiling.




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