Reference

The renovation of synagogues often involves changes to the roof structure. In several historical cases, renovations after 1910 included significant alterations. For example, one notable change in many synagogues was the addition of a two-tiered roof structure. This was done to enhance architectural aesthetics and improve structural integrity. The specific changes often depended on the architectural style and requirements of the period.

For instance, some synagogues that were originally built with simpler roof designs saw the introduction of more complex and ornate roof structures during renovations after 1910. This might include the incorporation of hip roofs, four-pitched roofs, and metal coverings to replace older materials that had deteriorated over time.

One example listed in the search results is a synagogue that experienced a renovation where the original wooden structure was reinforced with metal roofing, which not only provided better durability but also helped in preserving the historical aesthetics of the building.

For detailed cases, refer to the following sources:

• List of wooden synagogues - Wikipedia
• The intrepid couple who restored a gem of a Polish synagogue

These resources highlight changes made during the renovation periods, including alterations to the roof structures which were often necessary to maintain the integrity and historical value of the buildings.