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Deficiency

An unfavourable symptoms (or concern) of an asset requiring some type of corrective action, such as maintenance or repair, in order to satisfy a desired level of functionality and performance.  


Classification of Deficiencies
Listed below is a four-class classification scheme.

  • Warranty defect (intrinsic and premature failure during warranty)
  • Maintenance deficiency, such as a roof drain that has become plugged with leaves and other vegetative debris.
  • Lifecycle deficiency (intrinsic failure after warranty period)
  • Stochastic deficiency, such an unpredictable failure of an asset arising from force majeure.


Levels of Deficiency

The deficiency may indicate the level of failure, as follows:

1 1
Fig. Examples of deficient conditions exhibited by assets.


Illustration of a deterioration model for a roof system.
Fig. Illustration of a deterioration model for a roof system with distress metrics at different life stages.


3
Fig. Various samples of the result of deferred maintenance.


P-F interval illustrated with asphalt paving
Fig. The P-F interval illustrated with asphalt paving along the curve.



1
Fig. Excessive vegetation growth on roof.

See also:
Compare with:



1
Fig. Blistering in a polyurethane roof assembly.

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