Comments by "Doug JB" (@dougjb7848) on "Dreadnought Modernisation - A tri-wire balancing act" video.
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41:00 and thereabouts
Main armoured decking usually extended from the forward armored bulkhead to the after bulkhead, and from beam to beam, with openings only for barbettes, funnels, and access passages from below to above the deck. It may have been thicker over critical spaces like magazines and machinery, or a constant thickness, but it was not reduced under the superstructure.
The large difference between the square area the belt covered /vs/ what the armoured deck covered explains why, when decking was increased, it was usually on the order of one, maybe two, inches of additional thickness.
More often done was replacing original deck armor that might have been 1β, or a couple of decks totaling a couple inches, with a single thickness of newer-material armour steel.
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