Joist span issue

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Hello,

I have just removed a chimney breast from my kitchen up to the loft, and now have a hole in my floor where the breast used to be.

I need to fit 2 new joists and floorboards to fill the gap.

Now the original joists in the kitchen ceiling are 175x75, 400 centres, and of a 4.87m span.

But if I follow the up to date trada span table, for the 4.87 span i need, I require my new joists to be 220x75 C24. This would give me a level problem with regards to my original ceiling joists.

So what options do I have to address the levels? Do I build up the original joists with 45mm batons? Fit 3 175x75 joists at 200 centres? or could I use something like an I Beam, not sure if I could get them made of a 175 depth

Thanks
 
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wasnt the breast trimmed?
if so just install new joists between the trimmers on jiffys.
 
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No it wasnt trimmed, it was a strange breast that didnt go just straight up, it shifted to the right about a metre between the floor/ceiling divide, with an extra pilar in the kitchen.

 
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The joist closest to the wall is supported on the brickwork corbelling out of the wall, and the 2nd joist was sat on the chimney brickwork
 
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