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One corner post of our 1805 farmhouse porch was suffering from some rot:
According to my contractor (who is AWESOME :hammer
only a 2x2 inch portion of decking was still supporting the post:
Thankfully the porch is built like such a bricksh*t house it probably wouldn't have torn off the house if the post sank, just torqued some of the trim. It had sunk around 3/4 of an inch.
My contractor and I decided not to replace the entire post, just the rotted section. The joists of the porch were connected with through tenons and square nails. He jacked the porch up 1 and 3/4 inches.
As it happened my exterminator was around this week to do my annual termite inspection. He assessed that the wood was damaged by powder post beetles as well as rot (no termites or other bugs! And the powder post beetles are long dead! YEAH!).
Continued below...

According to my contractor (who is AWESOME :hammer

Thankfully the porch is built like such a bricksh*t house it probably wouldn't have torn off the house if the post sank, just torqued some of the trim. It had sunk around 3/4 of an inch.
My contractor and I decided not to replace the entire post, just the rotted section. The joists of the porch were connected with through tenons and square nails. He jacked the porch up 1 and 3/4 inches.

As it happened my exterminator was around this week to do my annual termite inspection. He assessed that the wood was damaged by powder post beetles as well as rot (no termites or other bugs! And the powder post beetles are long dead! YEAH!).
Continued below...