U-value calculation of glazing on custom windows
In the midst of a micro-cabin SIP build that uses very custom sized windows and doors. The frames have been built and are awaiting the custom-ordered glazing. I've searched all local suppliers of insulated replacement glass and can't find anyone that knows what the u-value is on the units which they sell.
Is it possible that u-value is only tested on completed doors and windows (As I'm being told)? If the finished unit has a u-value that is derived from the formulation that considers separate values of frame and glazing, isn't it reasonable that one would be able to source values for standard glazing with known: glass thickness, number of panes, and type of gas?
I can't believe these numbers don't exist except for the Pella and Anderson's of the fenestration industry when they rate their own finished product.
Any glazing geeks care to help me with this one so that I might have a more accurate shot at modelling with real performance numbers?
Posted Wed, 09/11/2013 - 16:41
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