How to finish lean-to roof

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25 Mar 2009
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Kent
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United Kingdom
Hello,

I have lost my builder part-way through a job so looking for advice on how to finish a new extension roof please?

For a single-story extension we were advise to replace the roof as the previous pitch was too shallow. As we were trying to minimise internal disruption and save costs we were told that the old roof should stay in place as it was holding up our ceilings. So tiles were stripped but otherwise this remained untouched.

New roof was then tiled by separate roofing firm, which looks great. I then lost my builder due to some unresovable differences, and I noticed the top of one side remained unfinished. I know this should probably have been part of the original blockwork wall (which was existing from original extension, rather than a new wall), but I can see that the original felt and battens are resting on timber – though I have pictures of our original build which shows this is a block wall beneath the strip of timber.

We now want to remove the ceilings and create new vaulted ceilings so I will be removing the original roof internally.

Can anybody please advise on the best way to block up this gap? The new end rafter is fairly close to the edge of the roof line so i'm not sure how I would get blocks in there. Also due to restricted access (the neighbour has a glass ceiling underneath this) I will have to work from above.

I am concerned about water tightness, and insulation. The lower part of this was finished with white cladding which I would probably look to continue with (again due to the restricted access which will rule out rendering).
 

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You might be able to use hollow soffit as a rain screen for the side. What pitch have those tiles got? it looks very flat!
 

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