rendering inside chimney breast

[hollybank]

Hi i have taken all the fireplace out of a house was wondering what was the best thing for neutralising the sulpher that has formed on the inside.The customer wants me to render inside so he can put a multi fuel stove in.Was thinkin good brush down and coating it in thick pva with neat cement mixed with it,any comments would be welcome.Thanks. ???

 

[skimmin2day]

i dont think its sulphur mate . i think its soot /tar

What ever steps you take here the soot /tar will still possbily come through the plaster.
The best way i can think of is to rebuil a wall as thinly as possible where it will be seen or maybe use brick tiles ???
Ive plastered several fireplaces over the years with soot problems and tried several different methods and the yellow patches allways come through the plaster /paintwork afterwards.
If you cant do this try painting with bitumus paint then rendering it.But it may still come through if theres a lot of soot build up.

clean of with wire brush,wash with parafin,paint wityh bitumus paint and then render it as normal OFFER NO GUARANTE THOUGH !

 

[lucius]

Cow dung used to be mixed with lime plasters in these situations to stop the stains coming through, serious.
Ive found it wont come through gloss paint.
Lucius.

 

[intensive]

only sure way m8. is use a membrane,wich can then be rendered over.

 

[hollybank]

Thanks guys heard the one about the cow dung a few years ago by on old spread [thought he was havinn me on]
when i was a lot younger.Think iwill go for the more cleaner way ie membrane,thanks for your advice guys.

 

[Gibbo]

use sulphur resistant cement give it a good clean and gypbond it

 

[dpbeds]

Never used it but it sounds like the stuff

http://www.abce.nl/prochem/chemicalien/hardevloeren_reiniging/sdsd492.pdf

Probably contact manufacturers to make sure as there ain't a lot of info there

 

[hollybank]

Never used it but it sounds like the stuff

http://www.abce.nl/prochem/chemicalien/hardevloeren_reiniging/sdsd492.pdf

Probably contact manufacturers to make sure as there ain't a lot of info there

Thanks for that should be easier to use instead of cow muck ;D