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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Heating and cooling: Wood stove: Insulating above the closure plate, is it common? Good idea?

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  1.  
    • CommentAuthorgreenfinger
    • CommentTime4 days ago edited
     
    Hi all

    I've got a wood burner installed in a builder's opening. Single wall flue into a flexible chimney liner. The thin steel closure plate is higher than the lintel in front - i.e. you can't see it when stood in front of the stove. I therefore often wonder how much heat gets "trapped" in that pocket of space behind the lintel, and subsequently escapes through the closure plate into the chimney void.

    So I've been thinking about insulating above the closure plate using mineral wool and wondered what people think to the idea? I've not come across much info of people doing that. Seems sensible to me but perhaps I'm overlooking something.

    I did mention it to the chimney sweep when he was last here and he was against the idea. Not sure how much I trusted his opinions though (on that and other things!). One of his concerns was the mineral wool combusting. I told him that in my limited knowledge it's not combustible but he wasn't having any of it!

    Any thoughts?

    Many thanks
  2.  
    Mine is backfilled with LECA around the flexible chimney liner, and the register plate is cement board. So the whole chimney is insulated all the way up to the pot on the very top.
    I don't see any problem with mineral wool, it isn't flammable.
    • CommentAuthortony
    • CommentTime4 days ago
     
    Providing it doesn’t have any recycled plastics content
    • CommentAuthorphiledge
    • CommentTime3 days ago
     
    He's likely unaware of this, but your sweep would/should be against insulating the flue as it could put a serious dent in his income!

    An insulated and therefore hotter flue accumulates far less soot and doesn't need sweeping anywhere near as much. Our liner is uninsulated up till first floor ceiling height and insulated thereafter and we have no soot whatsoever. I sweep the liner every 3-5 years and get maybe a third of a builders bucket of light grey Ash out of the flue and top of the stove. We run the fire hot and only burn well seasoned wood but couple those with an insulated/hot flue and the flue stays clean for years.

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