The roof joists are now in place despite cock-ups.
I didn't look closely enough at the drawing and should have worked outwards from the centres of the long glulams. Instead, I just started at one end and spaced out 600mm from there. Wrong ! But at the end of the day, it's all hidden and I can finesse any issues of OSB cutting.
The ring shank nails turned out to be a proverbial PITA...possibly because they are cheap c**p from Toolstation. Impossible to bang in without bending and so they are now in the skip. Screws and the Paslode. Only wee problem is that I think the Paslode nails might be a bit on the short side and so I've got some longer ones on order and it will take all of 20 minutes to whack them in all over the structure.
This was only a slight cockup - even if it was as bad as that. The drawing says to stick in two long i-beams at either end. They are supposed to overhang the timber bearer to give whatever the ceiling is made from something to fix to. But I went ahead and fixed them tightly against the rim-beam. Ergo no support. It's easily fixed by ripping down a long length and fixing that to the bearer to provide the missing support. However, if I'd put the i-beam where they suggested I would still have had to rip down some timber to give it a good fixing at the top to the rim beam. So..swings and roundabouts.
Now....I need your advice, chaps. In hindsight I would have fitted the two longest glulams slightly higher than the outside bearers to give me a little fall away from the lantern opening. Not that there should be any problem with puddling since it's going to be glass-fibred but in principle it's good to get rid of the water regardless. But I didn't and as it stand there is a fall but towards the lantern area. I could lift the ends of the short i-beams at the hanger end (lantern end) by packing out the hangers. Then cut some timber to bring the level of the top of the glulams to meet the elevated i-beams.
But is it worth it ?
I'd really like to crack on, get the OSB in and fibre-glassed as (a) the weather isn't brilliant and (b)there's loads more to do.
Any thoughts ?
If opportunity doesn't knock, build a door.