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Vermiculite Insulation Fill in New Chimney Stack

  • 03-10-2009 10:07pm
    #1
    windyboy
    Registered Users Posts: 90 ✭✭


    Hi,

    We are currently building 2 internal chimneys (against gable walls) on an ICF house with standard blockwork and 8" flue. We are starting the chimneys off a concrete prestressed slab on the 1st floor. After we have chosen our stove and gas fire unit we will connect up the chimneys.

    Can someone tell me the correct way to fill the void between the blockwork stack and the outside of the 8" clay flue. Is the Vermiculite insulation (Micafil brandname) simply poured in loose or must it be mixed with cement or sand?

    What happens if it gets wet?

    Thanks,
    Windboy


Comments

  • #2
    PirateShampoo
    Registered Users, Registered Users 2 Posts: 4,406 ✭✭✭PirateShampoo


    I think its poured in lose and not mixed with anything.


  • #3
    cnocbui
    Registered Users, Registered Users 2 Posts: 20,111 ✭✭✭✭cnocbui


    I have done this, but it was to insulate between a flexible S/Steel liner and an existing 8" clay flue on a new house.

    It was for a wood burning stove. I just poured it in loose between the liner and flue.

    All sorts of fun when the wind is up a bit :).

    If you are putting a wood burning stove in, I would strongly recommend you look into an insulated liner rather than use a clay flue.


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