Chimney stinks!
Author
Discussion

Legend83

Original Poster:

10,451 posts

246 months

Tuesday 1st February 2011
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Had our chimney swept about as year ago but not used the fire until this Christmas. Now, when used, it starts to stink the house out after a day or so.

Do I just need to get it swept again or is this symptomatic of something more serious?

NDA

24,928 posts

249 months

Tuesday 1st February 2011
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Could there be a broken nest or something up there? Can you see up there with a torch?

A chimney fire is a serious matter, it may be worth having it swept again if only for your own peace of mind.

nomisesor

983 posts

211 months

Tuesday 1st February 2011
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Does it smoke when you're using it, or do you notice a tarry smell a day or two later when the fire has completely cooled? Do you have a metal flap in the top of the fireplace to blank it off? Do you blank off the chimney when not using it? Is it difficult to light with blowback at the beginning?
If so it may be that, during cold weather when the fire's not been used, the usual updraught reverses and cold air descends down the chimney, bringing the smell (and cold) with it - easy to feel with the back of your hand or prove with a lighted match. We get that problem with one chimney if I forget to block it off at the base with the metal flap when it's not in use.

Legend83

Original Poster:

10,451 posts

246 months

Wednesday 2nd February 2011
quotequote all
nomisesor said:
Does it smoke when you're using it, or do you notice a tarry smell a day or two later when the fire has completely cooled? Do you have a metal flap in the top of the fireplace to blank it off? Do you blank off the chimney when not using it? Is it difficult to light with blowback at the beginning?
If so it may be that, during cold weather when the fire's not been used, the usual updraught reverses and cold air descends down the chimney, bringing the smell (and cold) with it - easy to feel with the back of your hand or prove with a lighted match. We get that problem with one chimney if I forget to block it off at the base with the metal flap when it's not in use.
Your description is perfectly accurate!

Tarry smell - yes.
Metal flap - no.
Difficult to light with blowback - yes.

I can definitely feel cold air coming down the chimney so presumably it is bringing all the lovely smells in too.

Now, we don't have a metal flap in our chimney as the fireplace installer said it could not be fitted due to the original nature of the chimney i.e. not an easy shape to fit one!

Are there any other ways of effectively plugging the gap between fires?

Zippee

13,947 posts

258 months

Wednesday 2nd February 2011
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Legend83 said:
Now, we don't have a metal flap in our chimney as the fireplace installer said it could not be fitted due to the original nature of the chimney i.e. not an easy shape to fit one!

Are there any other ways of effectively plugging the gap between fires?
I'd be interested in this answer as well - due to the type of fire we have there is no closing flap which can cause a draught when very cold/windy.
The actual draw is very good when burning, though we get a little smoke billow past the front when fresh coal is added.

eddie1980

419 posts

212 months

Wednesday 2nd February 2011
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You can get something called a chimney balloon. It s a balloon on a stick that you inflate in the chimney to block it, I just stuff the opening with screwed up news paper though.

FlossyThePig

4,138 posts

267 months

Wednesday 2nd February 2011
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eddie1980 said:
You can get something called a chimney balloon. It s a balloon on a stick that you inflate in the chimney to block it, I just stuff the opening with screwed up news paper though.
I have used loft insulation in a bin liner, it expands to fit.

nomisesor

983 posts

211 months

Wednesday 2nd February 2011
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HTH!

Whatever you use, remember to take it out before you light the next fire - sounds obvious, but I've come home to find the house reeking as someone forgot...

To reverse the downdraught when starting the fire, get a sheet of newspaper and light it uncrumpled at the base of the flue. The rapid burn generates enough heat to overcome the downdraught and send a bolus of hot air up to reverse the flow, when your room heat and the fire (which you then start immediately afterwards) will maintain the updraught. Careful not to let go of the paper or it will disappear up the chimney, potentially igniting a poorly maintained flue.