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I had windows and windows replaced by PVC joinery (4/14/10 thermal + sound glazing), ie 4mm interior glazing thickness, 10mm exterior glazing thickness. My thinking is: by what means and I make sure that the type of glazing installed is consistent with that provided in the quote and for which I was charged a capital gain. In fact the final invoice totally settled (for which I can not obtain despite several requests the mention "settled the... more stamp of the company) does not exactly reflect the services provided originally in the estimate (type of different dormant for example, while the window template is the same, or a type of aluminum threshold for a French window, no mention for another French window...) Thank you for the information you could give me.

At first, it is easy to check the total thickness of the glazing, 28 mm. It is then absolutely necessary to obtain the detailed invoice, which alone will make it possible to control with precision the correlation (or not), with the joinery and windows actually implemented.
Finally, more than details of a type of frame or threshold, it is also important to ensure that the installation was carried out in the rules of art, and particularly at the level of the junctions with the shell, a point sometimes neglected by installers, and cause significant thermal losses.You can control the thermal quality of this connection with a simple heat detector gun.

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