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  1. #16
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    Quote Originally Posted by Bushmiller View Post
    Interesting discourse between Rustynail and GraemeCook.

    If I had been asked, I would have said it was driven by the ability to use up "shorts" and provide stability thus adding value to what may otherwise have gone for woodchip. ......
    Almost certainly true now, Paul, but not then (or at least not by us).

    We only used full length timber. In fact, we could not have used shorts as we did not have a finger jointing facility.

    The first product produced was quite experimental from both the production and marketing viewpoints. We gave 10 m3 package of mixed sizes and species to each significant customer, and suggested that they trial it with their selected customers. One customer refused to take the product, the others all accepted it with varying degrees of enthusiasm. All later increased their enthusiasm. The decliner's buyers wanted to buy the laminates but "... the boss says no ...".

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  3. #17
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    Likewise. We didn't use shorts, even though we did have fingerjointers. It was an executive decision at the time to remain with full length material due to the individual pieces in a fingerjointed length taking on moisture at differing rates creating steps up the post along with uneven tension. Mind you, fascia and laminated beams were finger jointed clears and didn't pose a problem compared to knots.

  4. #18
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    Oct 2018
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    Hi GK and RN. Would lamination mean that the treated pine post/stump was better treated? I believe the point of end sealing after cutting is to make up for the difficulty of getting the preservative deep into 90mm of timber

  5. #19
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    Quote Originally Posted by Mountain Ash View Post
    Hi GK and RN. Would lamination mean that the treated pine post/stump was better treated? I believe the point of end sealing after cutting is to make up for the difficulty of getting the preservative deep into 90mm of timber

    Probably correct, but I do not recall seeing any comparative testing. RN may know?

  6. #20
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    Hi GC. It would be great to pick your brains further about the timber industry.

  7. #21
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    Impregnation difficulty was and still is dependant on many factors, not the least of which is the sophistication of the plant. Add to this the various forms of treatment (CCA and LOSP) just to name a couple, along with the condition of the timber all play a part in the quality of the end product. Thinner is not always easier. Yes, better and quicker penetration but stability becomes a problem, particularly with CCA. We didn't consider 90mm to be a problem.

  8. #22
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    Quote Originally Posted by Mumbo Jumbo View Post
    Hi All,

    I want to replace my verandah porch posts that are currently sized at 90x85mm and I want a more chunky look.
    MJ
    I had the same problem to solve years ago so I laminated 10 or 12mm Jarrah to the 4 sides of each post with some oxide coloured two pack glue . The treated pine posts had been up a few years before I got around to it . No movement ever showed up afterwards .
    The posts then matched the Jarrah deck as well as looking a better size.

  9. #23
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    Quote Originally Posted by rustynail View Post
    Impregnation difficulty was and still is dependant on many factors, not the least of which is the sophistication of the plant. Add to this the various forms of treatment (CCA and LOSP) just to name a couple, along with the condition of the timber all play a part in the quality of the end product. Thinner is not always easier. Yes, better and quicker penetration but stability becomes a problem, particularly with CCA. We didn't consider 90mm to be a problem.
    Does dressing TP (to remove the rougher headed grooves) undermine the preserving process then?

  10. #24
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    Impregnated treatments can be dressed. Surface treatments are not so lucky.

  11. #25
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    Thanks RN. How do I know which is which? I have assumed that all kiln dried TP is pressure treated and things like 150 x 25 rough sawn fence plinth is surface (because its soaked in a bath)? Is this right?

  12. #26
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    Not all KD pine is pressure treated. Much of the pine produced in Aust is sold untreated. Pressure treatments include CCA and LOSP. Spray or soak treatments are Blue and Red. Red is for Northern Aust and the Blue for the South.
    Hazard levels are numbered H2 to H6. Each piece should be clearly marked either stamped or taged showing hazard level, type of treatment and treatment plant. Visually, CCA is usually quite green while LOSP can be green tinged to clear. Best to rely on the stamps or tags. CCA is a high pressure impregnation. LOSP can be impregnated at a lower pressure causing less distortion. LOSP is not suitable for inground as leeching will occur. Chromium in CCA prevents this.

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