Hi Ian,
A small caveat:
In nature, wood compromising insects such as beetle... and similar, will enter the external layer of trees and wood in general. Females lay their eggs in the cracks and crevices of the bark and then upon hatching the larvae tunnel into the wood through the bark.
We have occurrences here in the Western Cape where floors that have "thick" layers of varnish or paint, are compromised by Common Furniture beetle regardless of the paint or varnish or oils that are applied to the timbers.
Furniture beetle are generally at the lower end of the scale as far as tenacity and resilience is concerned and there exists a colloquialism that goes: Hard wood-- Harder Beetle...
If there is any doubt, and you want to keep the timbers... get them treated before you store them....by the time you see sawdust or holes... it's too late
For the most part the physical barrier will act as a deterrent, .... the challenge is ... "you don't know what's inside in egg form, waiting to hatch.... unless you make a concerted effort to closely inspect for holes, or sawdust etc.. it's a bit of a gamble.
Hope this helps
Colin J
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