by bham » 28/04/09, 19:04
I don't think there are any standards on this, all that can change about this is the AEV (Air / Water / Wind) rating of windows. The wind resistance test indeed determines the deformation of the frame according to the wind speed and it is clear that a fairly large PVC window, without metal reinforcements, risks, on pain of not being sufficiently anchored in the masonry , to work a lot. My beauf had bought a PVC window with 3 doors at the corner DIY store, when he opened the doors, he noticed that the upper part of the frame was diving; good nothing serious if it is properly fixed but it can affect the seal.
After, it all depends on the design, you find PVC windows with a profile of 5,7,8 rooms supposed to improve thermal insulation, but they also stiffen the frame.
The triple glazed windows are probably also thicker and they probably call for another design.
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