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7 inch round hole through exterior wall for flue - safe?

Discussion in 'Building' started by pjsmith, 5 Oct 2013.

  1. pjsmith

    pjsmith

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    Hi,

    I need to get a hole made through my ground floor kitchen wall for a 7 inch diameter flue pipe.

    I've looked all over the web and people seem to just get busy with the drill.

    My concern is, the hole needs to be at a 45 degree angle, not horizontal through the wall. My walls are 1930's solid 13". At 45 degrees, that's a lot of material out of a ground floor wall (1st floor above). I can't see a single example where anyone has ever installed a small lintel or similar for such a hole, but I'm not feeling safe about it! The diamond driller I spoke to was happy just to get busy. Never brought up the concern of if it was safe.

    Can anyone advise?
     
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  3. saladdays

    saladdays

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  4. pjsmith

    pjsmith

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    Hi,

    Thanks for the reply. I read many threads like this. No-one seems to do into any detail of if such a hole can effect the wall.

    No-one has concerns about making a 45 degree 7 inch round hole through a 13" double block solid 1930's load bearing exterior wall?
     
  5. noseall

    noseall

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    You are unlikely to be able to drill a 45° hole through a wall with a core drill.

    You best bet is to remove enough material for the flue pipe to be installed comfortably then brick it in.
     
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  6. footprints

    footprints

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    Before fanned flues, boiler and water heater flues were about 12" square all that went through them was a thin steel liner I have never seen any wall collapse as a result.
    Google "self-corbelling effect" even if a lintel above a 2 or 3 foot window fails only a triangle of bricks above starts to drop.
     
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  7. Nige F

    Nige F

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    Then he will save you a lot of hassle cutting out and reinstating . I presume he will fix a jig to the wall and simply drill the correct size and angle . Wet or dry drilling it`ll be messy ,
     
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