I’m looking for an independent view regarding glazing and window film. I have a building where 100 micron film was applied approximately 13 years ago, I’m guessing for bomb protection. It is currently applied to a completely glazed internal atrium, with floor to ceiling panes, covering 14 floors.

A company selling glazing solutions has outlined to my surveying team that the film is outside warranty and does not meet current standards of 175 microns. Of interest, by virtue of the film being in place, the report suggests that we install glazing edge protection, to prevent the pane falling as a single unit, if impacted.

It is my opinion that the film will continue to perform its role whatever its age, particularly as it has not been exposed to direct sunlight. It is also my opinion, that it is very unlikely that any undertaking in this office environment would produce sufficient force to break and propel such a large pane of glass, further to a risk assessment we have completed.

Any experience/advice would be most welcome.

Dave, that is a great post and one that I'm sure many companies in the large cities should be considering. Given that the threat from one set of extremists has reduced to a very low level and the threat from the current set appears to be focussed on people rather than our buildings, is there still an ongoing need for this type of glazing film?

Perhaps a polymer scientist may be the most appropriate person to respond to the technical question on performance with age.

Sorry for the additional question with no answer to your original one.