Chimney Build Question

mjth2004

I was asked a question earlier today which has had me stick my nose into the Regs to find an answer – I didn’t find it, be it I missed it or like many things the technical guidance documents don’t cover the item in detail.

So I throw the question out hoping someone can point me in the right direction!

Neighbour cleaned his chimney. Lit a fire & with a couple of hours a smell of smoke could be got from his hot-press & attic space. He contacted the builder (surprisingly still on site – house is about 6 years old) & was told that he might of moved the flue lining when cleaning, which in turn allows the smoke to escape into the area between the outside of the flue liner & chimney stack, as only fibreglass insulation fills this void, & then through the blockwork.

It was my understanding that the space between the outside of the flue liner & chimney stack should be filled with an insulating material (weak line mortar or a proprietary lightweight insulating concrete) – is my understanding on this incorrect & fibreglass insulation is acceptable? Plus as this is a timber frame build I would of thought it would have been the standard detail.

Any answers welcome.

muffler

See bottom of page 7 in TGD J

The linings should be fitted with the sockets or
rebates uppermost. Liners should be jointed with
fire-proof mortar, and any space between the liners
and the brickwork should be filled with weak 1:1:12
cement/lime/sand mortar or insulating concrete.

mjth2004

Boom - job done, thanks for that muffler!

When I was looking for some reason I discounted Part J as it relates to Heat Producing Appliances & stuck with Parts A and B instead for guidance, my mistake!

Cheers!

muffler

Oh its easy enough to get the wrong doc. It happens to me on occasions when I go to look up something that I havent read in years

Poor Uncle Tom

muffler wrote: »

It happens to me on occasions when I go to look up something that I havent read in years

The manual on how to use the oven....:D

(only joking.....)

muffler

What's an oven?

martin46585

Might this be what your builder is referring to,http://www.schiedel.ie/residential-products/ceramic-products-and-systems/chimney-systems/schiedel-swift

Carlow52

muffler wrote: »

What's an oven?

rhymes with bun in:D

Carlow52

martin46585 wrote: »

Might this be what your builder is referring to,http://www.schiedel.ie/residential-products/ceramic-products-and-systems/chimney-systems/schiedel-swift

the outer layer here should be airtight so builder is full of ....

Mellor

That's a chimney system. completely different and not covered by TGD part J
Also, the insulation layer there isn't fibreglass and the whole system fits together, so the flue can't move. doesn't apply to the the situation in the OP.

tred

muffler wrote: »

See bottom of page 7 in TGD J

thats how mine was done. I helped mix and fill it

woody1

any ideas on remedies, may have similar problem, in i similar age property strangely, but id be fairly sure the flues are in properly and lined with the right material ..
or else
it may be that despite complying with regs in terms of height over roof penetration and distance between it and rooflights and slate vents that i have smoke coming back in thru the vents or the vents in the rooflights, smell i should say rather than smoke itself...
only occurring really in one room, despite the chimney being between 2 rooms, and that one room is the one with the rooflights and vents..

mjth2004

Sorry about delay in getting back to this question.

Went across to have a look at the chimney last night, the owner had converter the attic space so to get to the chimney we had to do some dry wall cutting (fun & games).

@Martin46485 – you are on the money, the system is the Schiedel Chimney System.

I think at this stage a camera down the flue is probably the quickest solution to see if any of the liner has been knocked out of sync & allowing smoke out.

@Carlow52 – have just seen the part about airtightness, will have to have a look at the IAB! Very hard to get the builder back on that I would think?

@Woody1 – that is now the cat amongst the pigeons?

woody1

have taped up the vents in the roof ( slate vents for extractors ) for the past 3 days and low and behold no smell of smoke, so its not a chimney construction issue thank god, need to get some backdraft dampers so i can have the vents operational and not taped up...any ideas on irish suppliers, the shipping from england is 3 times the cost of the damper

http://www.alertelectrical.com/prod/90/100mm-backdraught-shutter

martin46585

Mellor wrote: »

That's a chimney system. completely different and not covered by TGD part J
Also, the insulation layer there isn't fibreglass and the whole system fits together, so the flue can't move. doesn't apply to the the situation in the OP.

:rolleyes:


"completely different"!!!....what like the flue on an oven:D