These Rentokil plaques, from a 1960 damp-proof course system that did not work, are a mystery to some surveyors. They are often associated with 1960s damp-proof course systems. Many find the 1960 damp proof course system failure to be perplexing.

The first thing to understand is that the above system is not a damp-proof course or an electro-osmosis system. The copper cable did not create an electromagnetic field in the wall. The earth’s electron charge state is neutral, as is the wall’s masonry. Furthermore, the earthing rod does not supply more electrons to create a suitable field. In 1960, damp-proof course methods often resulted in courses which did not work. Hence, the 1960 damp proof course system failure was a common issue.

This misunderstanding has caused confusion in the building industry, as the Rentokil 1960s offering does not relate to an actual electro-osmosis damp proofing system. Indeed, a 1960 damp proof course, which did not work, was distinct from other methods. This further illustrates the 1960 damp proof course system failure.