A layer of __ may be found under the tar and gravel in roof constructions for older taxpayers.

In older roofing constructions, particularly those utilizing tar and gravel, it is common to find a layer of tin beneath the surface materials. Tin was commonly used in roofing applications due to its corrosion resistance and relatively low cost, making it an attractive option for many building projects during the time. This use of tin helps protect the underlying structures from moisture and other elements, contributing to the longevity and durability of the roof.

Other metals like aluminum, copper, and steel may also have been used in some roofing systems, but tin specifically was favored in many older constructions due to its properties and availability. Understanding the historical context of roofing materials helps in identifying potential structural issues and planning for renovations or restorations in older buildings.