tanalised wood

[heather murphy]

Does anyone know how long cca wood leaches for?    I have a client with an existing garden that is fenced with cca all around it (7mx4m) It has been in the ground since 1985. Does anyone know if it stops leaching at any stage??  If it does still leach; does it travel through the soil quite far away from the posts?   My theory is to plant non-food companion plants around the margins but am thinking that the roots web will all interconnect it with the food roots.   I'm stuck - the area needs to be fenced for dog control.  Any advice greatly appreciated

[Richard Grevers]

Of course the people who designated it H1-H6 were thinking of the hazards posed to the timber by its evironment and not the other way around!
At our PDC, we were given a figure of 5 metre radius of contamination for a ground-treated (H3) post (I don't have a source for that). Given that our town property is 11 metres wide, that doesn't leave much garden!

I'd be interested in knowing to what degree setting the post in concrete limits leaching (and whether rain running down the above-ground surface of the post picks up any contaminants.

I was pleasantly surprised yesterday to find that 150x150 durable eucalyptus was actually cheaper than treated pine.

[Richard Grevers]

Sorry, that should have been H4 (the comment editor seems to be broken)