On 11/05/2015 11:26, Jonno wrote:
gareth scribbled


As these things seem to rot at ground level and just below but not above,
then
perhaps the remedy is to seal with bath sealant where the post enters the
concrete, and then smear further sealant up the post for a further couple
of inches above ground level to prevent extended contact with water?


Or wrap the lower part of the post in plastic, which won't rot for 200
years. Course it'll also trap moisture in the wood too.

That is the problem, if the wood has to be below ground the only answer
is good pressure treatment and excellent drainage.