vertical flues

[AWheating]

after spending all day making method statements and risk assessments my mind has shut up shop and gone on holiday. Honestly dont know how some people spend all day if an office.... 🙁

anyways im now struggling with mind freeze, i have got to put together some information about installing vertical flues. Apart from manufactures instructions what if any other guidlines are there? whats the recommended clipping distances? and does anybody have any links? or know any boiler instructions that have some suitable pictures with clipping distances? etc.....

any help would be welcome 🙂

 

[GrahamM]

A flue should ideally be supported at every joint. I am constantly highlighting this issue to customers.

IIRC the standard is at least every 1.8M or at every joint. Unless MI's state otherwise.

 

[GQuigley67]

imho the manufacturers dont give you enough clips, they should at least supply you with a 4" bracket which is compatible with 10mm screwed rod, i find worcester dont give you enough screws or clips when doing their vertical flues

 

[AWheating]

A flue should ideally be supported at every joint. I am constantly highlighting this issue to customers.

IIRC the standard is at least every 1.8M or at every joint. Unless MI's state otherwise.

Thanks Graham,thats all i really have in writing, every 1.8m. I have stated clipping at every joint and bend unless stated otherwise by MI. I was hoping to find some detailed instructions with a picture or two but most MI dont even seem to state what they require. the term adequately supported along its entire length keeps cropping up 🙁 dont make engineers think, tell them what to do 🙂

 

[AWheating]

imho the manufacturers dont give you enough clips, they should at least supply you with a 4" bracket which is compatible with 10mm screwed rod, i find worcester dont give you enough screws or clips when doing their vertical flues

every extension has a joint, so why do they not come with a clip in the box?? im guessing because making extra money is more important than correct installation. I personally like the one that come with the terminal, can be bent to suit alot of situations. and why do many come with holes to big for a normal sized screw head 🙁

moan over.lol

 

[Rickster123]

Vaillant don't send any brackets with their flue extentions you have to but them separately which is outrageous IMho

 

[AWheating]

you can understand why some try to get away with some galvanised banding rather the buy the correct fixture.

 

[tamz]

Vaillant don't send any brackets with their flue extentions you have to but them separately which is outrageous IMho

In packs of 5 :lol: At least they take bolt rod but how many plumbers run around with a length of unistrut in the van?

Ideally band at every joint but sometimes this is not practical to do without running a bearer up alongside it. Every joint should be screwed with 3 screws to prevent movement in any direction (a basic principle overlooked by worcester who only supply 2 screws which allows lateral movement).

 

[darren bastin]

never feel happy about push fit vertical flues, put plenty of timber and clips but would like to screw the joints. But `if the Mi dont specify then cant.

 

[Nostrum]

1 clip per section/extension is how i've always done it. I always pop rivet the joints, as said above 3 per joint. They ain't going anywhere after that but feel sorry for the person who's got to drill out all the pop rivets when they change the boiler!

Makes a straight vertical flue easy though, drop it all in from the roof.

 

[GasmanxxxR1]

never feel happy about push fit vertical flues, put plenty of timber and clips but would like to screw the joints. But `if the Mi dont specify then cant.

You can drill and screw push fit flues, eg worcester

 

[GrahamM]

In packs of 5 :lol: At least they take bolt rod but how many plumbers run around with a length of unistrut in the van?

Ideally band at every joint but sometimes this is not practical to do without running a bearer up alongside it. Every joint should be screwed with 3 screws to prevent movement in any direction (a basic principle overlooked by worcester who only supply 2 screws which allows lateral movement).

Spot on tamz!
If not practical to clamp it at every joint, as long as is fully secure above/bellow that if it gets a bump it will not move then alls good.

1 clip per section/extension is how i've always done it. I always pop rivet the joints, as said above 3 per joint. They ain't going anywhere after that but feel sorry for the person who's got to drill out all the pop rivets when they change the boiler!

Makes a straight vertical flue easy though, drop it all in from the roof.

You're the pop rivet guy I was cursing last week then!:smile5:
Maybe a bit much, but as you say it aint going anywhere.

 

[Nostrum]

pop rivets are easier than screws IMO and cheaper! Once they are in they're not gonna come out or work loose. Plus in ten years time the screws will have corroded anyway so you'll be cursing the screws, where as the pop rivets can be drilled out in seconds!

What makes it worse is the poor quality brackets most supply, Worcester is a classic example!

 

[AWheating]

what i have done is claim a free box off a plaster of the screws they use to install metal framed walls. They are stainless steel and self drilling, and there is 1000 in a box, so should last me a while. Dont tell the plaster tho 😉

 

[capitanpugwash]

You can buy self drilling screws from screwfix in boxes of a thousand. They have a sharp drilling tip and can be used very easily with an impact driver to secure a flue in a few minutes with as many as you wish. Just put in metal grilles in the van and they worked perfectly for this too. Really handy to have around.