Sash Window Trends — Double Glazing Existing Sash Windows
I had not written a post in a while, so I thought I would catch up. Here is how I see sash windows over the last twenty years. Back then, the exciting new technology was the draught-proofing system. It was a brilliant idea, designed to keep homes warmer without breaking the bank.
The idea was so good that it is now part of almost every sash window refurbishment and replacement. As a result, we finally have a way to remove the inherent problems of beautiful period sash windows. That also brings us to the end of an era for louvre-style windows.
Louvre windows are no longer fashionable, and they perform poorly for heat insulation. They are also very vulnerable to break-ins. In fact, insurers will not cover some homes with them unless the opening sections are siliconed shut. Then there is fire safety, because nobody gave it a thought when these windows went in, yet so many homes had them.
Aluminium windows fitted inside original frames were gaining ground at the time. I could probably have replaced a whole house of original sashes in a day. Each one got a single timber lining inside and an ugly aluminium window outside. What a waste of quality joinery.
Still, aluminium can at least be melted down and the glass recycled. The plastic that took hold in the 90s is a bigger problem, because it fills our landfill sites faster than we can cope.
Does that sound like doom and gloom? Fortunately, it is not. Homeowners now appreciate the sash window, and they know that no other window matches it for looks and function.
UPVC copied the sash, but timber has bettered it. Double-glazed timber windows now look as slim as single-glazed period sashes. They also give the thermal and acoustic benefits of PVC.
Listed and conservation properties have mostly been well looked after. They did not get the same replacement treatment. Sadly, where it did happen and nobody noticed, we now have to fight tooth and nail to install replicas that match the originals.
It is a shame that the system gets in the way of honest work like this. However, it also blocks a far greater amount of dishonest work, so on balance it is reasonable. You cannot win them all.
The height of sash window fashion is now to install double-glazed units within the original sashes. It is cost-effective and environmentally friendly. The units are so well made that they last well beyond the guarantee period.
They are also heavier and improve security, so it is a win-win. Common sense says the trend will only gather pace, and we are set up for double glazing existing sash windows in London.
I will leave my rough thoughts there. If you think I have missed anything, please feel free to share your ideas.