In my house, I am renovating an under- central stair pantry area. The block in the photos is just below grade. Vapor barrier is non-functional plastic sheeting that I’ve cut back to the edge of the right wall. Previous construction was 1/4” plywood over 2×4 laid flat on the block. There were hot and cold water lines about halfway up the block, and a 30 year old nail strike in the hot line caused significant rot. Water lines were re-routed away from the area about 15 years ago, and the remaining framing appears to now be historically dry. I have removed all of the rotted timbers with one exception – the inside board of the doubleheader supporting the staircase landing/ceiling adjacent to the block. See A and B in the photos.
The remodel of a 140-year-old two-story home maximizes floor space and is designed to take on another 100 years.
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