my insulation project, not exactly as planned

dougstove said:

Unless the metal roof is slick enough to shed all snow, I think there is a risk of collapse under a significant amount of wet snow.

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After giving this some more thought, even though this damage could have been there for decades, the roof was probably being supported by the plaster and lath walls. That was one solid structure, now down the room is noticeably bouncy. I bet if I walked on top of the roof there now I might have problems. The ceiling, slope, and a few inches down the side was thick with wire mesh. It took me a couple days to tear it down, having to cut passes between all the trusses with a sawzall.

I'm thinking I can cut out the last couple feet of most of the damaged purlins and slide some new ones in there, just over the last two damaged trusses. Then reinforce the charred trusses with one or perhaps 2 2x4's. The trusses are pretty close to the same depth although a little less at the top (A hair under 3"), but I can't see an extra 1/2" causing too much issues.

Clarkbug said:

That sums up every project I have ever started. You always find what you don't expect, and its always super expensive or labor intensive to fix it seems.

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Yeah I now know good things aren't usually found when you tear down 100yr old walls! Generally its only bad stuff you find!