How tight should chimney flue liner top clamps be?

[ChrisKingston]

Lining the chimney while I have good scaffolding up on roof. I had to rebuild top of chimney and pots were off anyway. So I have gone for a top clamp on a flexible 5" /125mm stainless steel liner.

Flue went in chimney pretty easy. And this top clamp seems to hold it ok.

The bolts are tightened as far as they will go, and I went down 20mm or so so clamp is on liner all way round even where the liner ripped at end of cutting:

But the 5" insert is still completely loose:

Is this normal/ok? I was expecting it to tighten around the insert. Seems solid enough but really don't want to get back up here once the mortar is in and scaffolding is gone.

Thanks

 

[noseall]

Lining the chimney while I have good scaffolding up on roof. I had to rebuild top of chimney and pots were off anyway. So I have gone for a top clamp on a flexible 5" /125mm stainless steel liner.

Flue went in chimney pretty easy. And this top clamp seems to hold it ok. View attachment 347639
The bolts are tightened as far as they will go, and I went down 20mm or so so clamp is on liner all way round even where the liner ripped at end of cutting:
View attachment 347640

But the 5" insert is still completely loose:
View attachment 347641
Is this normal/ok? I was expecting it to tighten around the insert. Seems solid enough but really don't want to get back up here once the mortar is in and scaffolding is gone.

Thanks

That looks awful. Looks like cobbled up tat to me. Was it a cheap product? It certainly looks like a budget item. I'd be on the hunt for something more robust and that will last beyond the first lighting.

 

[ChrisKingston]

It was from flexiflue, all new stainless steel. But yes I wasn't blown away by quality as all three bits were about 40 quid. How might it fail?

 

[noseall]

How might it fail?

Is reliant on the haunching mortar?

 

[ChrisKingston]

I was going to put 2" bed of mortar up to top of liner in anyway as clamp is wider than the bottom of the pot.
And then a normal flaunching round the whole stack after.

 

[stuart45]

Here's one method of doing the job.

 

[Deluks]

Get a big jubilee clip around it all, sitting just above the clamp.
The jubi clamps it up, the strap you have stops in falling down 'ole.

 

[Deluks]

A couple of self tappers wouldn't go amiss either...

Not like this