Data from the RG is indicative. It will indicate where there is reduced or
increased resistance at the point of testing. I do not believe data is
reliable enough to compare against other RG tests for reasons such as bit
sharpness.
Once you have an indication of decay you follow up to quantify the extent of
decay accurately. The fractometer is calibrated and there are standard
tables to relate whether decay is advanced or incipient.
It depends on the value placed on the tree as to whether such tests are
undertaken. Both no test and just RG alone can be sufficient to make a valid
decision.
----------
From: Scanlon, Dominic[SMTP:dominic.scanlon@xxxxxxx.gov.uk]
Reply To: uktc@xxxxxx.tree-care.info
Sent: 30 January 2004 09:31
To: UK Tree Care
Subject: RE: Resistograph
Chris wrote:
<I understood part of the point to be to check that the sound wood which
you
hope is holding the tree up is actually sound and showing no strength
loss.>
Sorry to labour the point Chris - but consider the scenario - you suspect
decay in a tree, you drill with the RG and find a good level of sound wood
and a smallish decay pocket. You think this justifies keeping the tree.
So
you take a core and test it with the Fractometer. What is the fractometer
telling you that the RG isn't? If your reading showed sound wood why test
a
core? Or is the Fractometer able to pick up weakness not visible in an RG
reading? Or is it just a useful way of proving belt and braces in court
etc?
Dom
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