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what material between flue and wall?

  • 13-03-2016 7:57am
    #1
    Jim1000
    Banned (with Prison Access) Posts: 107 ✭✭


    hello folks,

    the first flue is a balanced flue from a grant multipass boiler which passes through a cavity block wall. There is 2 inches of aeroboard in the cavity. What will I use to surround this flue in the wall?

    The second flue is a twin walled external insulated flue which passes through the same wall, coming from a range. What's used to surround the flue in the wall?

    Many thanks.


Comments

  • #2
    Tom44
    Registered Users, Registered Users 2 Posts: 950 ✭✭✭Tom44


    Jim1000 wrote: »
    hello folks,

    the first flue is a balanced flue from a grant multipass boiler which passes through a cavity block wall. There is 2 inches of aeroboard in the cavity. What will I use to surround this flue in the wall?

    The second flue is a twin walled external insulated flue which passes through the same wall, coming from a range. What's used to surround the flue in the wall?

    Many thanks.

    Sand & cement.
    Grant flue takes cold air in via outer pipe, so its always cold.

    Twin wall insulated flue is insulated ( I think ) :rolleyes:


  • #3
    dathi
    Registered Users, Registered Users 2 Posts: 1,422 ✭✭✭dathi


    Jim1000 wrote: »
    hello folks,

    the first flue is a balanced flue from a grant multipass boiler which passes through a cavity block wall. There is 2 inches of aeroboard in the cavity. What will I use to surround this flue in the wall?

    The second flue is a twin walled external insulated flue which passes through the same wall, coming from a range. What's used to surround the flue in the wall?

    Many thanks.
    building regs part J
    3.8.2 Shielding: Flue pipes should:
    (a) be at least 25 mm from any combustible
    material, or
    (b) where passing through a wall, floor or roof,
    be separated from any combustible material
    by a non-combustible sleeve enclosing an
    air space of at least 25 mm around the flue
    pipe, or
    (c) where passing through a compartment wall
    or a compartment floor, be cased with noncombustible
    material with at least half the
    fire resistance needed for the wall or floor
    (see Technical Guidance Document B - Fire
    Safety).
    For a double-walled flue pipe, the 25 mm
    distance may be measured from the outside of
    the inner pipe.


  • #4
    Jim1000
    Banned (with Prison Access) Posts: 107 ✭✭Jim1000


    thanks lads.

    does that mean Dathi that nothing is needed for the twin walled flue as there is already 1 inch insulated all round? Thanks a lot


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