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DIY Chimney Balloons

  • 25-10-2015 2:51pm
    #1
    Calibos
    Registered Users, Registered Users 2 Posts: 7,816 ✭✭✭


    Was going to make 3 DIY Chimney balloons (Rubble Sack, Loft insulation and garish coloured warning ribbon) and did some further research before I started. Some posts mentioned a length of tube alongside the Chimney balloon to allow a small amount of through flow to maintain some ventilation in the room and also for preventing condensation issues inside the flue.

    Is that not defeating the purpose or does it still prevent the bulk of the heat loss?

    However now that I discover that a non perfect 100% seal is possibly necessary, I realised that 2 of my chimneys might not even need a balloon after all. 2 of them actually have flue lids or whatever you call them. I thought I needed balloons for those fireplaces anyway because the flue lids don't seal well at all. However if a small draft is desirable then those fireplaces are actually fine as they are.

    So which is it. Does one need to leave some ventilation with a chimney balloon or flue lid or not. Am I still preventing the bulk of the heat loss with a leaky flue lid or ventilated chimney balloon. If maintaining some ventilation is so important then why do the store bought chimney balloons not have a ventilation tube attached?


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