Windows Question

Industry standards for upvc windows and doors

I have had a uPVC window & door fitted. They are joined by a metal girder-like section, presumably for strength. The 'girder' was pre-attached to the window (I think), seemed to be screwed to one edge. It runs the full height of the window and almost the thickness of the door frame. On either side the fitter glued thin plastic strips to cover the approx 5-10mm gap between door frame & window frame.
To me, the metal will conduct heat from inside out. Relying on two lots of thin air gap plus silicon plus 1-2mm of uPVC seems inefficient.
Is this industry standard?

They are 'A' rated windows but what's the point if the heat leaks away around the edges? I guess the answer is test it on a cold day. If the seam is warm on the outside or cold on the inside then I guess I was right. However the company will have my money and I will have egg on my face.

2 Answers

Hi quick answer for your question. This is a standard item used by most if not all window installers and fabricators, I do understand your worry but it will have been tested and should meet all requirements, hope that helps
cheers p sharpe

Answered 16th Oct 2013

Sharpes Windows and Doors

Member since 15 Mar 2009

To Create a thermal break in an aluminium window a tiny small pvc strip is built into the window because the thermal performance of Pvc trim is far greater that it seems, so this plus an air Gap with a good joint is a very standard and common way to install.
Unfortunately with all joints to any windows and doors (Like window reveals etc) no matter how well sealed there is always a slightly worse thermal barrier at that point.
Hope that helps

Answered 13th Jan 2016

Riverside Joinery

Member since 10 Jan 2016

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