Chimney removal and joist need replacing/sistering

[moe]

Hello everyone,

I hope you are all doing well.

 

I find myself in a bit of a bind and would greatly appreciate some assistance regarding my previous post.

If any of you could lend a hand, it would really ease my mind.

 

I need guidance on a joist that measures 7x3, spanning 5 meters, made of old timber. I've taken out the chimney breast from top to bottom, and the stack has been removed all the way down to the cellar floor.

 

The chimney breast is on my side and isn't attached to the neighboring wall.

The issue I'm facing is that when I took down the chimney breast wall, the old joist wasn't fully embedded in the wall; it was short and rested on the chimney wall.

Currently, it is properly supported by an acro prop.

 

My question is, should I sister the new timber alongside the original one?

 

I can extend the new timber from wall to wall. Additionally, for added security, I could double the new timber, effectively creating a 7 x 6 timber connected to the old 7 x 3 timber using m12 nuts and carriage bolts.

 

Is this the best approach? Or do any of you have a better suggestion?

 

I look forward to hearing from all of you.

 

I can provide a diagram of the drawing if that would be helpful.

 

Thank you.

 

Kind regards,

Moeen.

[Nickfromwales]

3 hours ago, moe said:

I can provide a diagram of the drawing if that would be helpful.

You just answered your own question.

 

Pics please!!

[moe]

Hello! I've created this layout plan to the best of my skills. I hope you find it helpful.

[Temp]

So this is the joist that is now 7" from the wall?  

 

If this was a normal joist (eg one of a dozen similar joists crossing a room) then yes I would cut a 7x3 to fill the gap and extend into the wall. Then either sister josts both sides  or use metal joist repair plates extending perhaps 2 feet either side of the joint. 

 

 

However I hesitate to suggest this in your case as the floor structure looks somewhat unconventional. Is this joist is supporting a wall separating the stairwell from the landing? 

Edited 5 hours ago by Temp