Monitoring Interior and Exterior Wall Inspections within a Virtual Environment

Table 2

Irregularities and causes.

Classification	Irregularity	Characteristics and causes
Alteration in colour	Yellowing	(i) A yellow colour caused by ageing of the film of the paint or varnish; (ii) Action of environmental agents (solar radiation, temperature, oxygen, and humidity) on the binder in the paint provoking changes in its molecular structure
	Discoloration	(i) Partial loss of colour of the film of paint coating; (ii) Action of environmental agents (solar radiation, temperature, polluted atmosphere, and chemically aggressive bases of application) on the binder and/or the pigments of the painted coating