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  Reply # 2129375 19-Nov-2018 12:15
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Jonathan 1?'s posts are concrete.

20 years ago the timber treatment was CCA Tanalising. The problems with copper and zinc interacting still existed but not as bad as the newer treatments that have more copper in them.

Anything on a wharf was probably wrapped in Denso tape or heavily coated in pitch.



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  Reply # 2129383 19-Nov-2018 12:22
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Bung: Jonathan 1?'s posts are concrete.

 

Yeah, but his railings and palings aren't.


 
 
 
 


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  Reply # 2129421 19-Nov-2018 13:53
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I was aiming that at nick800 who mentioned 90mm posts.

For the twisting post problem the following yt video demonstrates using a car jack to pull the post out of the ground leaving just the original hole.
https://youtu.be/9LGsdaxrPj8

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  Reply # 2129452 19-Nov-2018 14:34
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Yes good point, replace the word post with railing in my previous comment




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  Reply # 2129456 19-Nov-2018 14:41
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Bung: For the twisting post problem the following yt video demonstrates using a car jack to pull the post out of the ground leaving just the original hole.
https://youtu.be/9LGsdaxrPj8 

 

Heh. I'll keep that in mind if mine needs looking at again.


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  Reply # 2129473 19-Nov-2018 14:56
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Bung: Jonathan 1?'s posts are concrete.

20 years ago the timber treatment was CCA Tanalising. The problems with copper and zinc interacting still existed but not as bad as the newer treatments that have more copper in them.

Anything on a wharf was probably wrapped in Denso tape or heavily coated in pitch.


CCA is still the standard as far as I am aware, has the treatment changed much?

Galvanized bolts seem to last fairly well as opposed to screws, depth of coating, surface contact likely reasons. Though for a balcony you I can see why stainless might be required.

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  Reply # 2129531 19-Nov-2018 15:29
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Our neighbour decided he wanted to paint the newly installed pine fence black. I warned him.... Two years on it's twisting apart and given its 40m long, it is going to cost him an absolute fortune to replace.


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  Reply # 2129547 19-Nov-2018 16:08
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wsnz:

 

Our neighbour decided he wanted to paint the newly installed pine fence black. I warned him.... Two years on it's twisting apart and given its 40m long, it is going to cost him an absolute fortune to replace.

 

 

Fek - our neighbours want to paint their side of the fence (the one I'm about to build) black, so I'll be damned fixing it in a few years if it's warped because of their colour choice! Will make this clear from the outset, so thanks for the warning!


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  Reply # 2129706 19-Nov-2018 18:01
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Lastman:
Bung: Jonathan 1?'s posts are concrete.

20 years ago the timber treatment was CCA Tanalising. The problems with copper and zinc interacting still existed but not as bad as the newer treatments that have more copper in them.

Anything on a wharf was probably wrapped in Denso tape or heavily coated in pitch.


CCA is still the standard as far as I am aware, has the treatment changed much?

Galvanized bolts seem to last fairly well as opposed to screws, depth of coating, surface contact likely reasons. Though for a balcony you I can see why stainless might be required.


See this article from BRANZ, the recommendations are probably now part of building code.

https://www.buildmagazine.org.nz/assets/PDF/B98-68-NewTimberTreatments.pdf

mdf

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  Reply # 2132715 23-Nov-2018 14:06
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Galvanized nails don't work so well in ACQ treated timber (i.e. the stuff that won't poison your garden, pets or children. As much). 

 

In Bunnings (Wellington Bunnings at least), ACQ-resistant screws and nails are now prominently advertised. Of course, there isn't any ACQ timber to buy, but surely that is a mere trifle!

 

---//---

 

For the black fencers, Resene Cool Colours are an option. Advertised to absorb the visible light spectrum, but reflect the infra red that is responsible for overheating, warping and general degradation.


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