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A 4 ply built up roof would have?

  1. 3 layers of felt and 1 layer of bitumen

  2. 2 layers of felt and 2 layers of bitumen

  3. 4 layers of felt and 4 layers of bitumen

  4. 1 layer of felt and 3 layers of bitumen

The correct answer is: 4 layers of felt and 4 layers of bitumen

A 4 ply built-up roof consists of multiple layers that contribute to its durability and effectiveness in waterproofing. The term "4 ply" specifically refers to a total of four layers in the assembly, which typically includes both felt and bitumen. In this context, a standard built-up roofing system would generally alternate layers of felt with layers of bitumen to create a robust roofing structure. Therefore, a configuration of four layers of felt combined with four layers of bitumen would provide a strong, multilayered barrier against environmental elements such as rain, wind, and temperature fluctuations. Each layer is integral to the overall performance of the roofing system, ensuring optimal protection and longevity. The other options do not accurately represent the composition of a 4 ply built-up roof. They either suggest an improper ratio or total count of felt and bitumen layers, which would not be suitable for a roof labeled as having "4 ply." Understanding the specifics of roofing constructions, particularly the relationship between insulation and waterproofing, can help one grasp why the correct answer reflects a complete and balanced system for effective roofing.