Loft storage. New joists on pole plate

Morning,

I have done quite a bit of scouring on the forum and the wider internet with a couple of posts that have popped up but never seem to have a full outcome. Hoping someone can help chip in with either alternate ideas or suggestions.

Recently moved into an old house that is Yorkshire stone. We are looking to convert the loft space for storage only (possible trainset in the loft too) (no plans to ever extend as the house is already big enough). The make up of the roof and ceiling joists is: internal brick wall which has 2x3 ceiling joists directly on to the brick wall. On top of this just offset to the inside of the internal wall is a 22mm floorboard and a 2x3 on top (pole plate?) with is taking the rafters. We have to further purlins going up to the ridge line.

I have been had a structural engineer out to assess what we can do. Originally we would have calcs done for habitable space and loft space only. After many back an forth about trying to avoid using steal c section on the purlins and suspending new joists from this and then to the internal brick wall. Not wanting to install steals for just a loft storage space. He has come up with the following.

Just wondering if anyone else has done it this way (see drawing).



Thank You

Nice, though fitting the ties probably isn't going to be fun. Perhaps attaching them to the end of the new timber first, before it's slid into place, will make subsequent screwing easier..

If it were my project and I weren't having to work to this spec I think I'd just wind a could of turbo coach screws into the end grain, cut the head off them and sharpen/ridge them with a grinder then hammer the joist into place from the other end than faff about in the miniscule eaves gap

Thanks @robinbanks. Hadn't really thought about access apart from trying a to get a 4.8m joist I've made from scrap in the loft before purchasing nearly 50 of them. Will definitely be pre attaching the brackets to the new joists before I get them in position now.

Ideally would have liked them on the wall plate but this seems like the best and easiest solution available as a DIYer.

Yeah in my mind it's the "getting them into the side of the joists, as you reach into the narrow space, lying on your side/stomach on a temporary board on the old joists, trying to align a screw magnetized onto the bit of your cordless, they try and apply enough force to keep it from slipping and ruining the bit.." thing that makes this tricky

If screwing them I think I'd actually buy a 450mm plus long pz2 screwdriver and grind the handle off so I could mount the shaft in the drill, so I didn't have to try and wedge myself and the drill so far into the eaves..

Don't know what the layout of the rest is but you could just run some timber beams across from gable to spine wall and hang joists from them.