Window Preservation Standards
Older and historic windows can be saved with ordinary maintenance, repairs and energy saving upgrades.
In the Fall of 2010 five window specialists realized the time was right to create national standards for the repair and weatherization of old and historic windows. The Window Preservation Standards Collaborative (WPSC) now includes over one hundred and fifty other window specialists from the United States, Canada, England and India.
Window Preservation Summit V: https://windowstandards.org/?page_id=569