I tried the wd40 method by drilling into the body of the locking method, it didn't seem to work at first, but now after weeks it has started working again. :)
It seems quite complicated for a lot of builders/roofers to install all the components necessary for a healthy roof!
A lot seem to rely on a breathable membrane, normally the cheapest, which is a mistake that will only get picked up a few years down the line.
Considering your joists are going to be 6 x 2" I would notch out a 2" section of the new joists so it can also sit over the pole plate, may need chamfering to the pitch of the rafters. One 80mm screw fixed through the new joist into the rafter is all that is needed for a connection, I would...
He wasn't driving to protocol / training so his driving was clearly not legal, yet he wasn't prosecuted ! that in the eyes of many proves there is one rule for one and one rule or another.
No, it doesn't! I know a police officer who killed an old woman walking across a pedestrian crossing when it was green to walk, he was speeding, took no notice of the red light , and ploughed into the old lady and killed her.
Looks like there has been a recent fix / new timber added, not sure why they have left that rotten rafter in!
as woody suggests treat it before you cover it up, I would cut as much of the rotten timber out as possible first.
https://www.screwfix.com/p/forge-steel-adjustable-basin-wrench-1-2-3-4-/410ychttps://www.screwfix.com/p/forge-steel-adjustable-basin-wrench-1-2-3-4-/410yc this any good
The problem with that idiology, is that ordinary people just don't feel connected any longer, they know they have been shafted, and they now have little respect left for those in power.