I realised that it would be necessary to cut into the roof cladding in order to determine the full extent of the corrosion in the steel reinforcement over the door, so this was partially done yesterday and completed today.  The plan is to repair this by letting in joggled replacement sections using structural seam sealer and countersink rivets then finish with a skim of filler.

Some sections of the the rotten steel were cut out today, primarily to allow access to the T-shaped steel flitch plate that reinforces the joint between the top of the door pillar and the cant rail.  This is quite badly corroded so a new one will be made.  With this out of the way the rotten wood can be cut out of the door pillar and repaired.

Repairs by welding will be made to the steel section over the door and window 1 by welding with 1.5mm ZIntec,  ordered today for delivery on the 21st.