This article was originally written in 2012, and since then the debate about the safety of externally beaded windows has continued. However the points below are still relevant.
Many questions are asked over what is more secure – an internally or externally beaded window. This is an issue which the pvc industry has played on for many many years highlighting the “advantages” of internally beaded windows against externally beaded windows but with today’s modern window systems, this argument no longer holds any water. Nor is this argument actually that “honest” if you look at the history of the early replacement pvcu windows.
There is much evidence to support this today but before giving you the proof. here is some history which you may or may not have be aware of.
It is a known fact that aluminium windows came before upvc windows and at the time these windows were invariably silver anodised, in a hardwood subframe and either single or double glazed. They were also externally beaded aluminium windows.
The very first upvc windows that came on the market had two common features:
1. They were an copy of an aluminium window in their design.
2. They were externally beaded.
It is also known by those who have been in the industry since the late 70’s or 80’s that anyone breaking into an externally beaded aluminium window, whilst they probably could, had a certain degree of difficulty in doing so – the main reason being the inherent strength of aluminium as a material. This is not to say you couldn’t break into an aluminium window, you could. Eventually. If you had time to do so.
What is also known and often commented upon by those with many years in the industry that the early externally beaded pvc windows were ridiculously easy to break into. The simple weak external upvc bead simply could not stand up to any kind of force like an aluminium window bead could and this resulted in them breaking with minimal effort. Modern pvc beads remain a simple plastic extrusion.
The solution by the pvc window industry was to introduce an internally beaded window because they acknowledged an externally beaded pvc window was easy to break into!
This is how internally beaded windows came about. The weak spot of the window on the outside, had to be moved to the inside to prevent the window being broken into easily.
The following post will deal with the security aspects of today’s windows and what is more secure? Internally or externally beaded windows?