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Thread: H4 Laminated Treated Pine Posts
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24th February 2021, 03:30 PM #16
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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24th February 2021, 05:12 PM #17GOLD MEMBER
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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.
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27th February 2021, 08:38 AM #18GOLD MEMBER
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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
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27th February 2021, 02:20 PM #19
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27th February 2021, 02:26 PM #20GOLD MEMBER
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Hi GC. It would be great to pick your brains further about the timber industry.
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27th February 2021, 05:47 PM #21GOLD MEMBER
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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.
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27th February 2021, 06:36 PM #22
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.
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28th February 2021, 09:37 AM #23GOLD MEMBER
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28th February 2021, 02:56 PM #24GOLD MEMBER
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Impregnated treatments can be dressed. Surface treatments are not so lucky.
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3rd March 2021, 10:10 PM #25GOLD MEMBER
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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?
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4th March 2021, 10:58 AM #26GOLD MEMBER
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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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