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  1. 17th May 2005, 11:45 AM #1
    Phil Jennings
    Phil Jennings is offline Member
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    Default Backsawn blackbutt exterior use?

    Hi Team,
    grateful for advice on using 300x40 backsawn blackbutt as a ramp to the front door for wheelchair access. I'm concerned about cupping of boards, the support structure and protection.

    Cupping: will 2 bolts at each end of a board prevent this?
    Support structure: 90mm angle iron bolted to koppers log posts?
    Protection: oil to maintain colour?

    All advice gratefully received.
    Thanks
    Phil :confused:
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  2. 17th May 2005 11:45 AM # ADS
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  3. 17th May 2005, 12:08 PM #2
    E. maculata's Avatar
    E. maculata
    E. maculata is offline overated member
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    Default

    I shall take it as Coastal Blackbutt (E. Pilularis) strength group #2 (very high stress loads) so ok there, Durability class 2 in worst case scenario moisture in ground with air humidity just right for bacteria = at least 15-25 years servicability, in other words go for it one of the better one s to use. If its not coastal stuff not as good.
    Bruce C.
    catchy catchphrase needed here, apply in writing to the above .
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