What is included in a two-ply hot mopped felts waterproofing system?

In a two-ply hot mopped felts waterproofing system, asphalt is a critical component. This system is primarily designed for roofing applications, where the waterproofing barrier is crucial for preventing water infiltration. The two-ply system typically involves layers of roofing felt that are saturated and adhered together using hot asphalt.

Hot mopping involves the application of molten asphalt, which bonds the felt layers and provides additional waterproofing capabilities. This method is well-regarded for creating a robust and durable surface that withstands environmental stresses. Asphalt's properties allow it to expand and contract with temperature changes, thereby maintaining its integrity over time.

The other materials mentioned do not fit the primary composition of a traditional two-ply hot mopped felts system. Fiberglass is often used in other roofing applications but not typically in this specific method of waterproofing. Similarly, polymers and steel may play roles in different types of roofing systems but are not the main components of a hot mopped felt system. Understanding the role of asphalt in this context is vital for any contractor involved in roofing and waterproofing applications in residential construction.