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Thanks for your advice, it all makes sense. The current rafters all need strengthening (some are split) and increasing in size anyway for the insulation so I'm adding extra 100x50 timbers to the face of each rafter for added strength and depth which should also help. For all the structural...

Doing a loft conversion - am taking every opportunity to strengthen the roof as I come across it; so the ensuite wall is going to act as an extra roof support wall / knee wall type thing running about 1000mmm parallel alongside the purlin. Whats the best way to attach the timber for this...

Thanks this was exactly my plan until I heard otherwise. Incidentally I thought the point of. T+g chipboard was that the joints didn’t have to be on the joists? 400mm centres joists but 600mm wide boards make this difficult

Not a bad idea really

Thought so

Currently doing my own loft conversion and about to fit the 18mm m/r t+g chipboard flooring. I *think* I know the answer but a carpenter friend has got me questioning my own opinion and just wanted some clarification. Am I right to glue the t+g joints and screw all boards down into floor joists...

...Or failing that could I use these extra long jiffy hangers to attach the trimmer joist to the existing wall plate that the new floor joists are hanging off? https://www.toolstation.com/shop/p15421

Sorry I'm not being very clear am i?! It is a BC approved job but the plans I have from my structural engineer are pretty crap I'll be honest, and the building control officer I had has left the company last week and the new one won't come out until the stairs are in! I at least need to secure...

Yes you’re quite right but the new joists don’t touch the existing joists they fly above them, just wondering how best to secure the existing ceiling joists once I cut them for the new stairwell. The new joists above will be all double trimmed around stairwell

Ok cheers for that. Cant build walls underneath as there's another staircase underneath but theres no weight going on this floor; the new floor flies above it. Will double up and fix temporarily with hangers until bc come out and see what they say. Thanks

Sorry have attached as jpeg.

Or like this; where trimmer is attached to wall via a joist hanger and attached to the end of each cut joist via another joist hanger

Doing my own loft conversion and about to break through the ceiling to install new stairs. New floor joists are all flying above current ceiling joists and don't touch them. Question is, when I cut the existing ceiling joists to chop out the hole, how do I secure them? Do I just screw trimmer...

Thanks all. Spoke to BC who said fine no problem. M10 it is. That’s bought me a good bit of extra head height! Cheers

Thanks! Are m12 enough?

Good point; I will be setting them around 50mm higher anyway as there are m16 bolt heads on top of the beam where filch plates join 2 beams together anyhow

So the reason I thought it wasn’t possible is because I tried before with crap bits and the literally just shrank before my eyes into nothing without leaving so much as a scratch. Cue quality bits and they went through it making a test hole like a hot knife through butter. So this is now a...

Dunno will crawl up tonight and have a look think it’s 175 off top of head

Right... going to rethink drilling the beam. What kind of lube? M16 bolts to join wood to beam?

Yes floor joists in loft conversion