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Is anything special required when installing storm windows over metal-framed primary windows?

When installing aluminum storm windows over metal-framed primary windows, it is important to create a thermal break between the storm and primary window frames to prevent heat energy from being conducted through the metal frames of the windows.  If an overlap mount installation is planned and wood brickmold trim surrounds the primary window, the wood trim can serve as the thermal break.  If a blindstop mount installation is planned, thin strips of wood or plastic may be placed between the storm and primary window frames to create the thermal break.

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