I've tried going in diagonally but am restricted by the next rafter so still clashes with ridge board. If i cut this end so it passes the ridge board it is then too short to butt up against the ridge board. The next step is to install new rafters, however when the wall plate end of the rafter is slid in to place with a seat cut, the opposite end clashes with the ridge board when trying to raise it in to position. The beams have been installed, the dwarf wall built above the beam is now supporting the existing rafters (photo hopefully attached!) And since the pic was taken horizontal ties have been installed with M12 bolts and spiked washers (toothed plate connectors) from the stud wall back to the existing rafters and ready to be bolted to new rafters (everything else in the photo is existing). I used the SE once before for beam calcs when i removed a load bearing wall and he was great, quick turn around and responded to queries swiftly, however its not been the same this time! Took ages to give me calcs and hard to get hold of for any queries which i had loads of - one being sequence of construction and the response was 'as per standard building practice'! Plan is just to use it as storage space and not actually a habitable space. I've got calcs from a structural engineer for the spliced steel beams, the dwarf wall, new deeper joists and deeper rafters etc., the existing structure is a TDA truss type with 4 trusses at approx 1.8m centres. No you're not reading it completely wrong and i understand your points, i probably should have stated what has already been done which would help understand it a bit more as i think I've got over the sequence issue with purlins.
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