How do I cap a chimney with a recessed top?

[halfmarathonmike]

Hi folks,

Been up on the roof to measure up for capping a chimney, and the stack has a recess as opposed to a pot sticking out. How would I can this? Would it need to push down into the recess?

225mm ID, 254mm depth

 

[EB1caneyeB]

I would bed a slab over it.

When you cap off a chimney you must put a couple of air bricks in stack.
On opposite sides ideally.

 

[Alastairreid]

Or fit an 18"can then a vent terminal.

 

[joe-90]

Or leave it like the other 80,000,000 out there.

 

[Nige F]

Gor Blimey Joe - I thought I`d swepped enough in me lifetime - When me an Mary first met I asked her how many she`d counted - weren`t as many as that Are you one of bleedin` Santa`s reigndeer Chim chim cherooo