"Easy" Chimney Breast Removal What To Do At The Top?

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OK so I started boarding over my room Artex ceiling... which happened to be completely warped so had to wedge battens and use string to make everything perfectly flat before boarding.

Now instead of plastering the ceiling which was supposed to be today's job a voice in my head got me to pick up the sledge hammer and knock half the chimney breast off :whistle:

I was gonna patch it up and make good but now am thinking why not remove the whole thing?

It's a "flat" sloped corrugated bitumen roof with a single chimney in the middle.
I could go up there and cut the chimney down until the weight is 4 brick rows tall (including the bit in the ceiling).
The brick wall behind the chimney is approx 14cm thick.
There are no joists resting on the chimney breast - they go around it.

Would something like this even need gallows brackets? 2 other houses on the street had it done and both chimneys are cut down so only about 2 bricks high sticks out above the roof.

Also would any Acrows work to prop the chimney stack up while I remove the rest? Tomorrow's job is the buy a couple of them and wedge some wooden scaffold board into a cut slot to prop it up so I can get on with removing everything below it.

How much roughly would it cost to prop up a cut down chimney? Considering the fact that most of the hard work would have already been done.

Thanks in advance.

Pics:

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I recently had a small chimney removed for £600 labour + scaffold, which I think was about £300 (not received invoice yet).

Took 2 people about 5 hours to remove the chimney, and a third person about an hour, maybe 90 minutes, to do the roof (one bit of timber, batten, felt, tile)..
 
I recently had a small chimney removed for £600 labour + scaffold, which I think was about £300 (not received invoice yet).

Took 2 people about 5 hours to remove the chimney, and a third person about an hour, maybe 90 minutes, to do the roof (one bit of timber, batten, felt, tile)..

Did that include the breast? I was quoted £3000 for what essentially a monkey with a sledge hammer could do.
 
OK guys I removed the breast... now onto the chimney and there are 2 options:

1. Remove the entire chimney and do the roof
2. Leave the chimney sticking out a bit and cap it

What's the best choice? I don't want to get leaks so I'm scared to remove the whole thing. And if I cap it what do I use... a cemented paving slap (to cover the hole) then torched on felt all the way around? Paint whole thing with Cromapol just to be sure?

Here's pics of the chimney from above:

 
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If you remove it below the roofline you will need to source those metal tiles first...think they come in strips of 5...
 
Did that include the breast? I was quoted £3000 for what essentially a monkey with a sledge hammer could do.

No, there was no breast, so smaller job. Had a quote of about £1500-2000 for full chimney removal a few years back.
 

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