UPVC Window Frames Chambers – why are they there and what do they do?

upvc windowWe recently got asked by a colleague about her UPVC windows. She was getting quotes for some new windows and the surveyor was saying the frames had 7 chambers.

That prompted us to think about how many folks actually know about the chambers in uPVC windows frames and what they are doing there.

SO, here is a quick guide to what they are, how they work and why you should have them.

UPVC Window Frames Chambers

As you can see from the picture on the right, this window and the frame have boxed sections within them. These are the chambers we are talking about.

Now there are a few reasons to have these, even modern aluminium windows have them, albeit slightly different.

The primary reason is to provide extra insulation. The chambers trap air and keep it from circulating, thus creating an additional insulating layer.

Secondly, chambers although you might not think it, add to the structural strength somewhat.

replacement windowsThirdly, and you can see it in the image on the left, the larger chamber in both the window and the frame can house metal reinforcing bars.

These metal reinforcing add greatly to the overall stiffness of the unit, preventing distortion. They also  have another benefit in that they provide good gripping for the fixing screws for the window hinges.

So there you have it – chambers add insulation & strength to UPVC windows.

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