On 2014-03-07 13:00:53 +0000, Martin said:

On 6 Mar 2014 17:05:33 GMT, Emery Davis wrote:

On Thu, 06 Mar 2014 14:09:00 +0000, stuart noble wrote:

On 06/03/2014 09:44, Nick Maclaren wrote:
In article ,
stuart noble wrote:


Mine are directly in the ground, because using concrete means that you
can't plant climbers ar their base. But, yes, using a concrete collar
(it doesn't need to go down below 6-9") does help protect weakly
treated posts.


That's pretty amazing


I also have pressure treated pine half-rounds directly in the soil, no
sign of rot after more than 20 years. And also put climbers on the
fencing where there's enough light. Believe me, the ground gets pretty
wet, too! :/ Oddly the rails seem much more inclined to rot than the
posts.

The chemicals used for pressure treating has changed since then. My son's
pressure treated fence posts rotted through after about 8 or 9 years. As a
result one of the recent gales made the fence collapse.
Lindane a poisonous chemical was used around 30 years ago, I recall that a
shipload sank off the Channel Isles in a storm at the time. There were
predictions in the press that it would wipe out marine life.
I went to a steam fair in Woodcote, near Reading in the mid 1984. On the site
was the equipment used for Lindane pressure impregnation of timber. The
chemical
had been spilt all around the pressure chamber.

It was used as a pesticide for many years, until it was banned.
Apparently, it shows up in Arctic sea water still and in worrying
quantities.
--

Sacha
www.hillhousenursery.com
South Devon
www.helpforheroes.org.uk