On 05/12/2015 15:33, Phil L wrote:


Yes, use concrete cappings, timber won't last 18 months



That is not much use .... I couldn't use concrete cappings easily as
overhang would be too great ... in any event I have bought the wood.

Don't know why you think it will only last 18 months.
Fully pressure treated Tanalized timber plus finish coating on top will
last a lot longer than that ..........