Thanks for making this video Derek, I hope one day you make video of vertical flue installation, I really want to see the detail of it.

Great video Derek. Never knew the Flue Snug existed until now. If the pre-existing hole is already 152mm wide, i can see their use to save time and make the job look neat, but i wouldn't cut a 152mm hole just to fit one. I'd rather cement the hole. I can see these being reused during boiler replacements where the new flue is a push fit, thereby causing an AR situation

I really appreciate these types of industry updates.

I had a rainwater leak coming into my Worcester boiler. I went out side and peeled back my rubber outer seal to find the installer had used interior silicon sealer to fill the gap round the flue and wall and it had shrunk. Water was running down my gable end and in behind the seal and into the house. I looked at various sealers and opted for a semi-setting rubber gutter sealer that could be applied even in the rain and on wet surfaces and could give me a good weather proof seal between the rubber guard and the roughcast wall. Problem solved. So if you have a drip coming from the bottom of you boiler, check the outer seal.

Who's coring 152mm hole for a flue snug. As most existing holes are around 120mm. Worcesters use of expanding foam is mainly to aid or expel working at heights. You're required to core 152 hole so the external weatherproof collar can be pushed out from inside the dwelling. In all cases I would still cement screw and fit the internal collar too. Great info Dez, here's to a better 2022 🍻. Onwards and upwards 👍

Nice very info special with reference of TB 152,153 bless 🙏, hope you make more videos on flue .different manufacturers of boiler ,i am sending you pictures how badly installed the flue by kitchen fitters

Great Derrick Sand and cement is a best Regards Faruk

Ive had a new flue fitted today. The engineer has left 3 gaping holes. My flue needed an extension as it goes through kitchen then a small room and then outside. I was gutted. I had a decorator here at time. He charged me for filling in the holes. Should the engineer of made it good before leaving?

Very informative video, covering this very common problem.. What the best thing if the brickwork is in a mess, Rebuild the brickwork and cement the flue into the wall ? Or possibly cement a piece of other pipe in and seal the flue to the wall as it passes through the pipe ? x The Bigfella x

Hi can someone help I have a valiant boiler which is 6 years old I have just had it serviced by British Gas and they have put a danger do not use sticker on it because he said my flue was not cemented in and was dangerous but ask do I want the gas turned off I said no Can some one tell me is this correct and should it need cementing in I have done this just to be safe I have silicone around the flue and a out seal Any help would be appreciated

Thank you for all you do for us, Merry Christmas!!!

Thomas Bradwell Thanks Derek

Great technical video derek like allways .

A very good video topic Derek. Tres bien!!!

Very informative, cheers 👍👍

Just stick to sand and cement, it's cheap 😀 but silicon the flue first. That will take care of any shrinkage probs. Great video though, you are the man 👍

Useful video, thanks Derek👍👍👍

This is a good one. Many thanks.

Flue jointing compound is alright?

Very helpful, thanks.

what can I use to seal gas flue internal on a sloped ceiling?

I would also agree with the opinion that external flues should be sealed to prevent water ingress into wall cavities, dampening cavity insulation etc. I have seen weather collars fitted over external flues that hardly cover holes but excepted? If you were to carry out a service or gas check, and you came across a flue sealed with expanding foam, then how could you confirm it's fireproof and the correct material? Sand and cement all the time for me IMHO.

great video again. learn lot. thanks

Very Informative , cheers TomKat

Sand/cement every time 👍👍🎄

Great detailed vid as usual thanks Derek. Would you agree that the picture from the TB (at 03:00 on the video) seems to suggest that sealing with sand and cement from either inside or outside is acceptable?

Some good points. Can you answer this on sealing flue on timber frames using ideal logics plz

Thanks great video 👍

As someome who was told by bg that thier flue wasnt sufficently support despite sand and cement seal , screws amd 1 clip this video just adds tl my argument , bg are adament it needs 2 clips which is fine for belt and braces but stupid to say potentially dangerous given the other fixing points.

Thanks for the video.:]

Top video again 👍

I’m gonna start riveting the damn flues from now on 😎

Does fluesnug and pipesnug guarantee the slope downwards and upwards or you need to drill at an angle? I know that using a core drill hole saw at an angle is very hard and plumbers usually to overcome the issu do drill larger diameter holes and then slope the pipes inside? How to do that using this system? And if I already have 4 inch hole to reuse, what can I use to enlarge it to 152mm?

How would you class damage flue terminal?

Mu outside flue end the black bit is missing any ideas where I can get the end please thanks

Derek can you fit flue jointing compound around flue internally?

In regards to classification as AR, if a boiler is sealed on the inside but externally there is no rubber collar and/ or you are unable to fully inspect the flue visually externally (high level flat) to confirm its fully been sealed with sand and cement externally, would this be deemed AR?

Hi Derek, Top video again. What can be done if you are installing a boiler in a 3rd floor flat or above and you can’t seal the boiler from outside or are struggling to get the collar on?? Thank you.

Anothe informative video. Thanks

Your a ⭐️

Excellent 💐💐💐💐👍👍👍

Hi Derek, thanks for your videos they are really helpful. What about flues passing through timber framed buildings? I read they need to be lined and sealed?

hiya dereck good point but i,ve had an issue on a boundary before document j saying it could not be done but other properties on same street was exactly the same wot is your views on this thanks mike

We have to silicone and piece it in

Has any one used the “In 2 Out flue seal would this be compliant

I would alway use sand and cement, certainly not the flue sung, drilling out a bigger hole will make the problem worse

Can you sand and cement outside behind the weather seal then foam inside?

What’s your thoughts on using silver tape over the flue joins. I was always led to believe that tape wasn’t aloud as it hides the join so can’t be inspected and may be hiding something. Great vid

Harder to seal outside if your on a high rise block sadly

👍🏻👏🏻

Keep a bag of ready mix in the van, takes 5 mins and finishes the job better

🤘😎🤘

Just use sand and cement, then all requirements are covered

Mustafa akbari

So you say sand and cement.. on a new build??? Plasterboard wall.. seriously..