Chimney removal and joists needs replacing/sistering

[Moeen ahmed]

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.

 

[accelerator]

You'll get better replies if you add a diagram and pics.

Rgds

 

[Moeen ahmed]

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

 

[cdbe]

If it's close enough to the wall use a joist hanger, otherwise extend via sistering.

 

[Moeen ahmed]

If it's close enough to the wall use a joist hanger, otherwise extend via sistering.

Hello, I appreciate your response.

Unfortunately, I won't be able to utilize a joist hanger.

It seems that sistering the joist is the more likely option.
Is a full-length piece necessary for the sistering?

I can obtain a joist that spans wall-to-wall for the sistering. - Should I use the same size timber for the sistering as the original? The old timber measures 7 x 3.
Please keep in mind that the timber spans 5 long.

I look forward to hearing back from you.

Thank you,
Moeen.

 

[cdbe]

You would just use a short length - If it's that one on the top left of your picture that says "not in wall" then it looks like you only have 15" but that should be enough. You might still find it easier to carry the end of your new piece on a joist hanger but a photo would make it clearer.

 

[Moeen ahmed]

You would just use a short length - If it's that one on the top left of your picture that says "not in wall" then it looks like you only have 15" but that should be enough. You might still find it easier to carry the end of your new piece on a joist hanger but a photo would make it clearer.

Hello,

Thank you for your prompt reply.

I have included a picture for clarification. As you can observe, both the stack and the chimney breast have been entirely removed. The area where the joists are situated was once supported by a 'U' shaped chimney breast, which then divided into two chimney breasts that extended down to the cellar.

In the image, marked in red, you can see that the joist measures 5 meters in length—one end is secured in the wall while the other end is free. The unanchored end is positioned 7 inches away from the wall.

On the other hand, the joist marked in yellow is located on a load-bearing wall, but it is 9 inches away from the wall.

I apologize if I am being overly detailed; my intention is to make everything as clear and straightforward as possible.

I hope this information proves useful.

Best regards,
Moeen.

 

[cdbe]

I thought this rang a bell - you've asked about this years ago and if I recall correctly were given suitable advice??

 

[jj4091]

Not a builder but I would think you need to extend all 3 of the joists in your pic. The ones marked red and yellow and the one that is just supported by a protruding brick as you will probably need to remove it to get your new ceiling flush. The one on what you say is a load bearing wall seems to be only supported by a wooden lintel above a door frame. I would not be happy with that for the extra work involved in doing it like the others. I would have thought a couple of extra metres on each joist with plenty of bolts would have been adequate but I am not a structural engineer either. I also think fitting some noggins would be helpful. It really needs to be safe if you are going to use it as living space.