Sealin flues

[Leo21]

Just had call from a customer who's had a new gas supply, the carriers have been in to re commission the boiler.
And aparantly the flue has to be sealed internally and externally! Anyone heard of this, or is it bunkum?
Its a combi, horizontal flue.

 

[kris]

Have look Leo,

https://www.gov.uk/government/uploa...file/167986/20130325_SA04_13_boiler_flues.pdf

 

[kris]

I remembered reading this and thought it was relation to the flange being put against the wall on the inside without sealing , , on the introduction

 

[hammers4spanner]

Ive always sealed inside and out never thought much of it

 

[Leo21]

I reckon it relates to the external rings, people not pointing up behind them.

 

[mfgs]

I've always done both as standard. Feels a bit unfinished to leave a gap around the flue on the inside.

 

[plumbdoctor]

Yeah it should be sealed inside and out regardless of collars. What a load of old carp

 

[Leo21]

I think of the inner one as a dress plate tbh.

 

[kris]

At the end of the day Leo if it was single brick for example it would only require a seal from external combustion so you've done that , even a cavity wall your still preventing combustion re entering with an outside seal ,
This below shows numpties using the rings and not sealing atall,

http://www.hseni.gov.uk/gsis-010-flue-terminals-safety-alert.pdf

 

[Roger Welton]

Personally point up inside and out with mortar only takes a few minutes and when done the flue isnt going to shift, even if some scally dangles off it.

MI don't help sometimes as they say you can install from the inside and form a seal by pulling the weather collar back against the wall.

 

[gassafe]

Worcester allow the black sealing ring to be a weather seal apparently no mortar needed, but I always mortar outside as some Scrote could easily pull the black ring off!

 

[Leo21]

At the end of the day Leo if it was single brick for example it would only require a seal from external combustion so you've done that , even a cavity wall your still preventing combustion re entering with an outside seal ,
This below shows numpties using the rings and not sealing atall,

http://www.hseni.gov.uk/gsis-010-flue-terminals-safety-alert.pdf

That's my thoughts as well.

 

[buckley plumb]

Last time I did acs they said seal in and out

 

[TFGplumbing]

I always seal inside and out.

What classification would you guys give ifs its sealed outside with sand and cement but not inside on a std flue kit?

 

[Leo21]

I always seal inside and out.

What classification would you guys give ifs its sealed outside with sand and cement but not inside on a std flue kit?

Good job, nothing to see here.

 

[plumben]

Always seal inside and out, pre mix mortar and ready mix plaster nice neat job, looks good all round

 

[kirkgas]

To me if its a cavity wall and not sealed on the inside its NCS, building regs requires that our work doesn't leave draughts, eg broken flooring, holes drilled too big, excessive damage etc,

 

[AWheating]

From memory Wb are the only manufacturer ive seen who has a detailed guide to sealing from inside using the rubber collar. They do require you to seal the gap from the insider behind the rubber seal.

Its shocking the number of flues not sealed, i serviced a WB with a tele flue last year which i reached up for and pulled on to see if it was secure and i pulled the flue out, no sand and cement, no tape and screw...... shocking somebody was to lazy to even put the screw in.

 

[IDCHAPPY]

I fit Ideals and they specify Inner and outer rings are sufficient

 

[IDCHAPPY]

The premix sand and cement you get in wee tubs from Plumbcenter is goof for filling in though

 

[newcastle phill]

All good and well unless its 4 floors up.

 

[AWheating]

I fit Ideals and they specify Inner and outer rings are sufficient

does it state this in the instructions? i dont think they have a securing screw on there flues to stop it coming off the elbow?

 

[newcastle phill]

Also poofix do tubs or ready mix fire cement for 3 quid