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  1. #16
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    Feb 2003
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    Garvoc VIC AUSTRALIA
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    it stays shiny a lot longer than gal
    Regards, Bob Thomas

    www.wombatsawmill.com

  2. #17
    Join Date
    Aug 2003
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    Pambula
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    59
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    That's why my roof is Dune Grey Colorbond. I wanted the look but the local airport gets a bit ancy about tin roofs.
    "I don't practice what I preach because I'm not the kind of person I'm preaching to."

  3. #18
    Join Date
    May 2003
    Location
    Kuranda, paradise, North Qld
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    Quote Originally Posted by silentC View Post
    That's why my roof is Dune Grey Colorbond. I wanted the look but the local airport gets a bit ancy about tin roofs.
    Can't the pilots afford sunnies?

    Mick
    "If you need a machine today and don't buy it,

    tomorrow you will have paid for it and not have it."

    - Henry Ford 1938

  4. #19
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    Aug 2003
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    Pambula
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    That's the stupid thing, they all wear those dark glasses that they get free when they graduate from flying school.

    But then, I don't want them crashing into my house, so I did what I was told...
    "I don't practice what I preach because I'm not the kind of person I'm preaching to."

  5. #20
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    Aug 2006
    Location
    Sydney
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    65
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    1,248

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    I'm nowhere near an airport but we aren't allowed shiny rooves (roofs?) either. Its so people living higher than you don't get their retina's blasted.

  6. #21
    Join Date
    Oct 2003
    Location
    Kentucky NSW near Tamworth, Australia
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    86
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    1,067

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    Quote Originally Posted by echnidna View Post
    gal will last longer if you are near the coast
    Not true Bob

  7. #22
    Join Date
    Aug 2003
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    Pambula
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    Quote Originally Posted by Bleedin Thumb View Post
    I'm nowhere near an airport but we aren't allowed shiny rooves (roofs?) either. Its so people living higher than you don't get their retina's blasted.
    I knew someone who had one of those A-frame houses that were popular in the 70's. The roof was tin and they were eventually forced to paint it after complaints from the neighbours who were getting blinded in the morning or afternoon (depending on which side of the house they lived).
    "I don't practice what I preach because I'm not the kind of person I'm preaching to."

  8. #23
    Join Date
    Sep 2006
    Location
    Behind that little door under the thicknesser...
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    44

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    I've just started doing re-roof (Colourbond) and wall cladding (zincalume) on our house.

    We wanted galvanised sheet walls mainly because of the aesthetic value (it fades out nicely) however:

    1) galvanised iron is way more expensive than zincalume
    2) galvanised iron does not come with a perforation/corrosion warranty like zincalume does...

    Basically it was the former that nailed it for us.

    Take the zincalume....
    Ours is not to reason why.....only to point and giggle.

  9. #24
    Join Date
    Oct 2003
    Location
    Kentucky NSW near Tamworth, Australia
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    This is for the benefit of ytbc showing the difference of gal and zincalume after about 20 years of weathering.

  10. #25
    Join Date
    Dec 2007
    Location
    Melbourne
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    0

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    Is gal on the left?

  11. #26
    Join Date
    May 2003
    Location
    Kuranda, paradise, North Qld
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    Quote Originally Posted by ytbc View Post
    Is gal on the left?

    Yes

    Mick
    "If you need a machine today and don't buy it,

    tomorrow you will have paid for it and not have it."

    - Henry Ford 1938

  12. #27
    Join Date
    Oct 2003
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    Kentucky NSW near Tamworth, Australia
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    Quote Originally Posted by ytbc View Post
    Is gal on the left?
    As Mick said yes.

  13. #28
    Join Date
    Feb 2003
    Location
    back in Alberta for a while
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    69
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    1,133

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    Quote Originally Posted by ytbc View Post
    the shack is now progressing - I am planning to clad it in corrugated iron - roof and walls - I have been told the galvanised iron is not as shiny as zincalume - or at least it isn't when gets older - any views on which is preferable? I would prefer something not to shiny as it is a bush block.
    Things you need to know:

    corrugated iron is what Blue Scope Lysaght calls Custom Orb® and Custom Blue Orb®

    If you're happy to go with one of the Colourbond colours or Zincalume then you can use Custom Orb® which is available with a Base Metal thickness (BMT) of 0.42 or 0.48mm

    if you must have galvanised (Lysaght calls it Zincform — zinc coated galvanised steel) you'll have to go for Custom Blue Orb® which has a BMT of 0.60 or 0.80mm

    the base metal thickness directly translates to cost

    don't forget that you can have any length sheet you want — usually the practicle limit is the length of the truck making the delivery — eliminating the end lap between sheets saves you money.

    for most people, the difference in base metal thickness translates to the spacing of the batterns to which you screw it and hence the number of screws you need.

    be sure to get the battern and screw spacing right for your area


    ian

  14. #29
    Join Date
    Oct 2003
    Location
    Kentucky NSW near Tamworth, Australia
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    Quote Originally Posted by ian View Post

    if you must have galvanised (Lysaght calls it Zincform — zinc coated galvanised steel) you'll have to go for Custom Blue Orb® which has a BMT of 0.60 or 0.80mm

    ian
    Ian

    As far as I know up to three and a half years ago Lysaght were still rolling 0.42 BMT Zincform Custom Orb Hi-Tensile. The Custom Blue Orb is used for curving such as Bullnose or for water tanks.

    The Custom Orb in zincform 0.42 is used as normal roofing and they also keep it for roofing on intensive farming such as piggery's and poultry sheds.

    Blue Orb has a tensile strength of G300 and Hi-Tensile Custom Orb steel has a tensile strength of G550.

    There is also a difference of the coating classes of the two steels.
    Custom Orb Z/L has a coating class of AZ150 which is 150 grams of coating to the m2
    Custom Orb Gal has a coating class of Z450
    Custom Blue Orb Z/L has a coating class of AZ 150 and AZ200
    Custom Blue Orb Gal has a coating class of Z600

    The reason the gal has a heavier coating because the life of gal is directly related to the thickness of the coating whereas with Zincalume the coating thickness has mainly no bearing on the life of the zincalume.

  15. #30
    Join Date
    Feb 2003
    Location
    back in Alberta for a while
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    69
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    Barry

    Through a coleague at work I've obtained a copy of Lysaght's latest Referee.

    It lists Zincform as an available finish for 0.60 and 0.80 Custom Blue Orb but not for the thinner 0.42 or 0.48 Custom Orb.
    But you can have stainless steel in 0.42mm Custom orb for your piggery if you want


    ian

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