Go to Forum Home Building Simulation Modelling performance of existing windows

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      Phil Bixby
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        Does anyone know of reliable information anywhere regarding modelling of performance of existing windows – particularly sash windows? U-Values and Psi-Values? I'm doing a combined extension & retrofit project and it seems nuts to be modelling everything to two or three decimal places on the new bit but resigning myself to vague generalities on the old bit! I've tried searching the forum here, but nothing's popped up…

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