So I'm back with more stuff on the sunroom painting. I expect this to be over this weekend. It's taking me away from The Dungeon and I need to get back down there!
This kind of thing is like rust on old cars. It's usually worse on the inside than it appears from the outside.
I used a jamb saw to make a horizontal cut across the top. My first cut was about 1 1/2 inches (maybe 35mm) deep. I'm going to cut a "block" out so I can determine how deep the rot goes back.
My chisel was quite sharp so it did well on this job. However, I think it needs to be sharpened after this. (Making a mental note).
After I removed this section, it was clear that the rot went back about another inch and a half, so I cut more out after this.
The Milwaukee people make a variety of blades to fit this thing. It's fantastic.
This is at the top of my list for zombie apocalypse tools. You can kill Z's with it AND it's a survival tool. Brilliant.
I'm trying to make the cut out as square as possible so I can fit a new wood block in to replace the rotted wood I cut out.
This pillar is on a side of the house where there is a tree, so it stays damp on this corner for many days after it rains.
The rotted area is on the right side - it looks like a cave. It went back about 4 inches (10 cm) or so.
My guess is that the caulk between the wood and the brick cracked, allowing water to penetrate from the bottom.