What were 5 pound and 8 pound lead used for?

The use of 5 pound and 8 pound lead in plumbing applications is tied to their densities and the specific requirements of different plumbing tasks. The 5 pound lead was typically utilized for flashings, which are the components that seal and protect joints between different surfaces to prevent water leaks in roofing and other applications. Flashings need a material that can easily mold and conform to the shapes required at seams and edges, and 5 pound lead is light enough to be manageable while providing adequate sealing properties.

On the other hand, 8 pound lead was commonly used for stubs, which are short pieces of piping or materials that extend from a fixture or connection point. The additional weight and durability of 8 pound lead make it suitable for stubs, where it can withstand the forces and stresses associated with connections to systems without compromising structural integrity.

This distinction in usage aligns with the properties of each type of lead, emphasizing how weight and application context dictate the choice of material in plumbing installations.