Classification for flue not sealed to fabric of building?

[Masood]

Morning all,

I'm scratching my head a bit here - I always thought that a flue not sealed to the fabric of the building, ie with sand & cement, not just the rubber ring supplied with flue, was classed as AR. However, I checked GIUSP last night to refresh my memory and it's not even mentioned in there.

So I'm wondering how I got it in my head that it's AR, and how would you classify it? I'm talking about a scenario where a 4" flue is in a 5" hole, no sand/cement or even expanding foam to hold it, and just the rubber ring on the outside. Nothing on the inside wall.

Cheers!

 

[Reg Man]

There are two main issues here. Is the flue likely to become detached if its wobbling about in the hole, Secondly, is there a likely hood of products of combustion entering the property. On the first account it could be AR, on the second account it could be ID and RIDDOR reportable depending on an assessment. Refer to 8.4 GIUSP. I would just check the flue and seal the hole up while I am at the premises.

 

[Masood]

There are two main issues here. Is the flue likely to become detached if its wobbling about in the hole, Secondly, is there a likely hood of products of combustion entering the property. On the first account it could be AR, on the second account it could be ID and RIDDOR reportable depending on an assessment. Refer to 8.4 GIUSP. I would just check the flue and seal the hole up while I am at the premises.

Thanks mate! As you say, GIUSP 8.4 covers it in general terms, but I was positive that I'd read the words "sealed to the fabric of the building" somewhere! Memory playing tricks on me, clearly.

Property is empty at the moment as my customer has just bought it. I'm back there on Friday to sort a few bits out so will take care of it. There's potential for both things you describe - flue is slopping around in the hole and it exits right on top of a decorative brickwork thing so the rubber seal does not sit firm. Strong possibility of POCs being blown back into the house. No idea of original fitter details, so no RIDDOR, just rectify it...

 

[Destroyer2813]

Ain't we had this debate before the general consensus was most would just fill it in and not worry about it, but I seem to remember something being said about worcester allowing the rubber seal be sufficient as if you flue right your making life extremely difficult for yourself when it requires a strip down service. I stand to be corrected though

 

[Masood]

Ain't we had this debate before the general consensus was most would just fill it in and not worry about it, but I seem to remember something being said about worcester allowing the rubber seal be sufficient as if you flue right your making life extremely difficult for yourself when it requires a strip down service. I stand to be corrected though

I did a search, couldn't find any old threads! I'll have another poke around. I've done full strip down services on WB and don't remember any issues with having to move the flue. Unless it's on specific models.

I agree, fill it in and job's a good 'un, but what if you haven't got sand & cement or fill & fix on the van at that time?

 

[ambrosia]

we had a similar thread 'if heat proof expandable foam was a suitable material to seal a flue'
most people said it was until someone pointed out under certain conditions the foam can crush the flue

volkera wont allow those rubber seals which come with the flue as sole means of sealing a flue, however vailiant allow it and you could argue MF trump everything else. but as different manufactures have different rules it leaves it quite inconclusive
i for one would like a diffinative answer on this, i do a lot of CP12 and flues not sealed with cement is common, often i cement the hole up, but often there isnt time. An individual assessment of risk doesnt seem right on this issue

 

[buckley plumb]

How to install a flue for a Greenstar boiler - YouTube