As much of the U.S. enters a period of sustained high temperatures, the demand for heat-resistant and waterproof roofing systems is surging. According to the latest data from the National Centers for Environmental Information (NCEI), average temperatures in June 2025 have risen by 3–5°F above historical norms in many regions, with parts of Texas, Arizona, and California exceeding 110°F.

These extreme conditions are putting immense pressure on roofing materials, accelerating the aging and cracking of older roofs, and increasing the risk of leaks and structural damage. In response, more contractors are switching to high-performance synthetic roofing underlayments to ensure long-lasting protection in extreme weather.

Trend: Synthetic Underlayments Lead the Way in Heat-Prone Regions

Unlike traditional asphalt felt, modern synthetic underlayments made from polypropylene or polyethylene are lighter, easier to install, and offer significantly greater resistance to high temperatures and water intrusion. Many high-end products feature specially engineered structural stability, making them resistant to warping, tearing, or failure—even under prolonged sun exposure.

Voices from the Field

“We’ve fully transitioned to synthetic underlayments for our Arizona projects,” said a roofing contractor based in Phoenix. “They hold up better in the heat, and our crews are working faster and safer.”

Regulatory Shifts and Industry Standards

With more local governments integrating energy efficiency and roof durability into building permit requirements, some jurisdictions are now recommending—or even mandating—roofing materials that meet higher performance standards. Experts predict that “heat resistance, waterproofing, and sustainability” will define the next generation of roofing systems.