Sean wrote:

Does anyone know much about PTT ?

If you dig a hole, put in some hardcore/gravel and plonk in a PTT
.... back
filling with more gravel and compacting ... how will it fair with the
elements?

Basically, is it really necessary to concrete the posts in as they
will be
securely held in place by the (above ground structure).


Don't remember all the reasons why, but current thinking is NOT to use
concrete, but rather gravel as per your question.

Lew