What is this metal work?

[Roy22]

I'm looking at using a hole drilled by a previous owner but which he never used. He was running a flex outside for a PIR light, but he drilled two holes before the third one he actually used for the flex. My purpose might be to run a low voltage power wire to an outside camera.

I poked a borescope all the way through (brick then insulation then breeze block most likely) before withdrawing it and some snaps. Some metalwork comes into view at the far end, I guess this caused him to abandon his first two drilling attempts when he hit it. What is this metalwork? A joist hanger? I can't be sure of the orientation of the image. It's around ceiling level of a ground floor toilet against the front of the house, built 1995.

Relatedly once identified, how much gap might be between the inner breeze block and the metalwork? I'm thinking of running the low voltage wire up in that gap and through a floorboard if enough space.

 

[23vc]

Looks like a joist hanger with a joist attached to it

 

[Roy22]

Good, as I thought, and I'm assuming the brown section (top left) is the wooden joist running off horizontally to the left. How close to the outer breezeblock wall would you expect the first joist to be hung, i.e. what gap might there be for routing a low voltage wire?

 

[23vc]

Could be a anything from a few mm, to say 150mm ish, any more and the plasterboard hung from it would sag. Can you not measure it by marking something straight and thin? Or do you not know the wall width accurately? Nails in upstairs floorboards may also give a clue.

 

[Roy22]

@23vc - Yes should have thought of that! Cheers!