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Best get the calcs done by an engineer.

Oh _ from the pic it looks like a Simpsons JHA450/150 hanger. There is no alternative size - you have to pack out.

Hi, you will have to pack out either side with 6mm plywood. Nail the ply to the joists with at least 5 nails (in the same pattern as a dice). The little gap left will be okay as the hanger will allow for 1.5mm deflection either side. Bobs yer uncle. Good luck

The Simpsons Joist End Support is only really for front wall to back wall applications so is perfect for a terraced house for example where you don't want the hassle of party wall agreements with your neighbours. Or the difficulty getting steel beams in. You cannot use this system in every...

Yes, the system is the easiest way to put in a loft conversion as you don,t need steel beams. All the joists run from back to front of the house and it takes half the time. Watch your height though as they will be about 300mm high. Hope this helps