Techniques > Systems > Windows > The Repair and Thermal Upgrading of Historic Steel Windows >

 
 

Summary

The National Park Service recommends the retention of significant historic metal windows whenever possible. Such windows, which can be a characterdefining feature of a historic building, are too often replaced with inappropriate units that impair rather than complement the overall historic appearance. The repair and thermal upgrading of historic steel windows is more practicable than most people realize. Repaired and properly maintained metal windows have greatly extended service lives. They can be made energy efficient while maintaining their contribution to the historic character of the building.

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