My 1929 Craftsman house has similar design... 2 gable vents but no soffit vents, and no possibility of installing them. Air sealing your ceiling was a great step, but look into "deck vents" marketed by Air Vent and other brands.
Deck vents are a shallow wedge that goes under the shingles, covering a 1" (2-3cm) wide slot to allow air in or ...
Adding a vent to the ceiling of your porch would only be beneficial if you open up any exterior windows and doors leading into the porch. Then you'd have air flow from outside through the porch and up into the attic. The only time it would be useful would be in the summer when you'd be replacing 130 degree air with 85 degree air. so yes, it would benefit in ...
This is a great video for this:
Measure what you need and go to the home depot or whatever and have them cut some OSB. they have those big saws that will cut the pieces nice and straight, and I think the first like 3 or 4 cuts are free.
then just a matter of hanging it.
I'm planning on letting the moisture air dry for a few days before doing anything. Is this necessary?
It will help when it comes to patching up the damage on the rafter tails. For the other required repairs it doesn't really matter.
...a 12" section of 2x4. If I just leave this wood in place will the rot grow?
If left alone, yes the fungus causing ...
I would have a 2x2 on either side and attach the Sheetrock to the 2x’s as long as it’s not in contact. I have limited steam experience but have enclosed the supply and return lines, I had asked the inspector on the first time I did this and he said it would be fine on that system I called it steam but it was really hot water it was 200f max.
I would try to ...
I don't see a drip edge installed.
That would stop the water from migrating uphill on the shingles. Maybe it isn't installed properly: It should not be up against the fascia and should overhang onto the utters.