Suspended Floor Joists

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Hi all,

I've recently moved into a 1935 3 bed semi with a single storey rear extension built in 1982.

Ive been investigating the suspended timber floor in the rear living room with a view to insulate. A third of this room extends into the modern extension. I fully expected the flooring to be osb in the extension as a continuation of the existing floorboards.

Upon removing a section of osb I find timber joists just floating on wedges, not tied into anything. Furthermore the wedges range from wood, tile and slate. The joists are level in themselves but not each other, and certainly not with the existing floor.

Is this normal practice?

I'm now leaning towards installing a timber ledger against the wall (dpc between it and said wall) with m16 through bolt anchors, and then tieing in the joists to that? That way I could get the ledger true to the existing suspended floor joists and get a level floor throughout.

I also intend to replace osb for like for like floorboards so this would benefit.

Sorry for the awful quality pics. The pic with the level shows the original external wall inbetween old and new joist.

Any thoughts?

Thanks, James
 

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what are the joist tails sitting on - a DPC or a timber plate or masonry?
the tails or tail packing must sit on a bit of DPC at a min.
pack with hardwood offcuts if possible - slate is for wedging up not packing.
there's no need for a ledger - the joists can be packed up to an even, both ways, floor plane.
noggins can be used to tie the joists to each other or L-brackets could pin them to the blockwork/masonry.

pic 2 shows a dark patch of something on a joist near to the camera - what is it?
 
Tails are currently packed with a mix of offcuts, tile, and slate. They are sitting on a dpc, which is sat on built up masonry.

Good idea about noggins, I'll try that once I've spaced them and packed up even.

The dark patch is a knot in the wood.

Thanks
 

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