Part J assistance

LoTwan

I have read Part J, in particular the section relating to outlets from flues and minimum clearances but I am not certain about a particular situation.

The flue would be run up the outside of a wall with no opes leading to a roof with no opes. Height to wallplate is 3.8m with a further 2.1m to the ridge.

Does the top of the flue have to extend 1m beyond the wallplate? or 1m beyond the ridge line? Or am I reading it wrong altogether?

BryanF

your looking at diagram 1?
If I'm reading you correctly, then its 1m min from the upper side of where the flue meets the roof.. hope this helps, give a sketch if you need more info:)

Carlow52

As your flue is up the wall and not coming through the roof as such I see the question.

Good practice, regardless of the code, is that the top of the flue is 600 mm above the ridge of an A roof.

This will give the best performance with minimal risk of down drafts etc.

The is also an un written recommendation that a solid fuel stack should be 20 feet:)

LoTwan

This is what I am talking about. The red line is 1m above the eaves, the green is 1m above the ridge.



Carlow52... what happens if you are putting a stove & flue into a bungalow? How do you manage the 20ft of flue then?

Carlow52

I just did this in a dormer bungalow and went 600 over the ridge, not a meter, look at tgd again. I used a lego-type construction and am very happy with it.
The dormer gave me the extra height.

are u considering a stainless steel double skin flue, apart from looking brutal, it will only last 10 years and will cost as much as the proper job.

I came out through the roof

ps is 3.8 + 2.1 +.6 not the guts of 21 feet?

LoTwan

Going out through the roof is not an option and unfortunately 2.6m of flue sticking up in the air is not an option either.