"Jacko" wrote in message
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"gareth" wrote in message
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"Jacko" wrote in message
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I do understand
why posts and poles are pressure treated.
AIUI the reason for pressure is to arrive at a greater depth of
preservative that would arise from just soaking and capillary
action alone.
Yes.
It has nothing to do with the permeability of the wood otherwise,
as another pointed out, rainwaterwouldn't be a problem.

Therefore the suggestion by G3OHX is a good one.

No, the reason that pressure treatment is used is because
just leaving the wood in contact with the preservative
doesn’t see it soak in well enough.

Which is what I said. Taking the relative times available for
commercial treatment (as qucikly as possible) and amateur
use (over time) then the approach of putting preservative
into a hole whence it can slowly seep makes sense.