In terms of the Radcon warranty what defines a stable crack compared to a working or moving crack?

Unfortunately when builders construct structurally volatile sites and they begin to leak it is the waterproofing supplier first in the firing line.
There are some very simple observations and trials which can be helpful before the University experts with their potentiometres are brought in.
For example either side of a working crack usually causes a fretting at the edges where small chips of concrete crack away.
If in doubt a simple test is to epoxy some glass microscope slides either side of the crack and monitor.
For example a car park when driven over may crack the slide demonstrating volatility.
Furthermore a building roof may be volatile moving between wet and dry weather periods.
Again this sort of activity should crack the glass indicating structural volatility.

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