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e tSame thing I had on my verandah when I replaced the boards about 8 years back. Out of 30 joists,
2 were rotted similar to this. The others were fine. This was built originally about 1978.One of the rotten ones had failed like yours, the other looked fine for its age on the outside, but when you went to nail into it, the nail just about fell in as the inside was gone.