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  1. #16
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    Looks like I am going to have to vent outside the roofspace by the sounds of the replies. Not overly keen to go through the brittle 1950's tiles so looks like it will be cutting holes for the vents through the asbestos eaves.
    Wondering how the best way to cut say a 150mm dia hole x 2 through asbestos sheeting might be. Obviously a good dust mask. But what would be the best tool?, jigsaw, holesaw etc. Not really experienced in cutting this stuff.

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  3. #17
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    Apr 2011
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    If it is asbestos; test first. If positive have the sheet (or more) professionally removed and then replace with cement sheet which you can with the right PPE and tools cut a hole to suit your needs.

  4. #18
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    Dec 2011
    Location
    SC, USA
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    If I could figure out how to swing it - I would much rather work the vents back out the underside of the eaves if possible.... Then you don't have to deal with the prospect of new roof leaks.

    Barring that.....

    The "Best" way to do this is to contact a good roofer... Likely - you go mucking around up there and you will break a bunch of those old brittle tiles.... Do the roof penetration wrong and you are the proud owner of a leaky roof....

    Always always have a real roof guy do holes in roofs..

    Like your plaster job - find a fellow who knows how to work on this sort of roof and you will be time and money ahead on the job.

    On who runs the vents.... If it's vent fans - then generally whoever runs installs the fan runs the ducts. Any mechanical contractor should be able to do it....

  5. #19
    Join Date
    Feb 2003
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    back in Alberta for a while
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    68
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    Quote Originally Posted by artful bodger View Post
    Looks like I am going to have to vent outside the roofspace by the sounds of the replies. Not overly keen to go through the brittle 1950's tiles so looks like it will be cutting holes for the vents through the asbestos eaves.
    Wondering how the best way to cut say a 150mm dia hole x 2 through asbestos sheeting might be. Obviously a good dust mask. But what would be the best tool?, jigsaw, holesaw etc. Not really experienced in cutting this stuff.
    As HandyJack advised there is no "best way" to cut through asbestos sheeting. Best is to replace one or more sheets with modern cement sheet and cut your holes in that.
    Don't know the rules in Tassie, but in NSW a homeowner is allowed to remove and dispose of up to 10 sq.m themselves.
    Just remember to
    1. wear appropriate PPE
    2. wet the material down
    3. punch the nails / clouts through the sheet
    4. don't use a hammer to smash it up.


    BUT
    your tiles only date from the 1950s. While brittle, they won't be impossibly so. (my Sydney house had tiles dating from much earlier which could be walked on with care.)
    I'd be looking to vent straight up through the tiles and not touch the eaves. If I did need to touch the eaves, I'd look to replace all of the asbestos sheeting.
    regards from Alberta, Canada

    ian

  6. #20
    Join Date
    Apr 2018
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    Nsw
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    64
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    Your eaves will be just as brittle as your roof tiles so there is just as much chance you will crack your eaves cutting a hole
    Venting through the roof is no big deal, you only need to remove one tile and replace it with a preflashed cowl, not a difficult job to do you just have to be careful not to do more damage.

  7. #21
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    Best way to cut asbestos sheet is with a grinder fitted with a diamond tile blade.

    Mod edit Do NOT do this
    The person who never made a mistake never made anything

    Cheers
    Ray

  8. #22
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    Aug 2003
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    Conder, ACT
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    Quote Originally Posted by rwbuild View Post
    best way to cut asbestos sheet is with a grinder fitted with a diamond tile blade.

  9. #23
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    Aug 2008
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    Birkdale
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    279

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    Quote Originally Posted by rwbuild View Post
    best way to cut asbestos sheet is with a grinder fitted with a diamond tile blade.
    do not do this.
    There is no safe way to cut asbestos, and it should be left alone unless it is being completely removed.
    I repeat, do not do this.
    Cutting with a grinder produces huge amounts of very fine airborne dust,

  10. #24
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    Im so glad that everyone picked up on this, I did this deliberately to reinforce the point
    The person who never made a mistake never made anything

    Cheers
    Ray

  11. #25
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    A dangerous way to make a point. You only need one person to read that and then take off, grinder in hand, before they read the rest of the thread.

  12. #26
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    I stand chastised, in hindsight it was a stupid way to make a very important point

    Probably best if one of the moderators removed that particular one please
    The person who never made a mistake never made anything

    Cheers
    Ray

  13. #27
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    Aug 2003
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    Conder, ACT
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    Let it stand as a lesson to think before you write

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