In the field of building materials, the choice of roof underlayment is of vital importance for the durability and performance of

buildings. Nowadays, the emergence of a new type of synthetic roof underlayment is gradually changing the industry landscape

and is expected to replace traditional asphalt felt. The synthetic roof underlayment is usually made from polypropylene (PP),

polyethylene (PE) and other polymer fibers, and is formed into a multi-layer structure through the spunbond or thermal bonding

process, covering waterproof membranes, reinforcing fibers and anti-slip surface layers.

Although it is relatively thin, its internal structure is compact, and it exhibits excellent toughness and strength. In contrast,

traditional asphalt felt mainly relies on organic substrates impregnated with asphalt, such as paper or cellulose fibers, and

its surface is sometimes covered with fine minerals or fillers. This material is not only relatively heavy but also has poor stability.

Under the influence of long-term climate change, the characteristics of asphalt and organic fibers in traditional asphalt felt

make it extremely prone to degradation, which leads to a decline in roof performance, and problems such as leaks may occur,

increasing the maintenance costs and risks of buildings. However, the new synthetic underlayment, by virtue of its material

advantages, is lightweight, has strong stability, does not rely on asphalt components, effectively resists the interference of

environmental factors, is not easily deformed or degraded, greatly extends the service life of the roof and reduces long-term

maintenance costs.

For the construction industry, the wide application of synthetic roof underlayment will improve the quality and durability

of buildings and promote the industry to move towards a more environmentally friendly and efficient direction. With the

continuous progress of technology and the in-depth promotion in the market, the synthetic roof underlayment is expected

to become the mainstream choice of roof materials in the future, bringing new development opportunities and changes to

the construction industry.