Which of the following is not a common problem associated with modified bitumen roofs?

Shattering is not a common problem associated with modified bitumen roofs. Modified bitumen roofing systems are typically designed to be resilient and flexible, which helps them to withstand various environmental stresses. The materials used in these systems are engineered to endure temperature fluctuations and physical impacts, reducing the likelihood of shattering.

In contrast, curling at the seams, cracking due to extreme heat, and seam separation are issues commonly encountered with modified bitumen roofs. Curling occurs when the edges of the bitumen sheets lift, often due to aging or improper installation. Cracking can happen when materials expand excessively in high heat, leading to stress in the membrane. Seam separation is a result of poor bonding or degradation of the adhesive, which can compromise the integrity of the roof system. Understanding these distinctions is crucial for recognizing and addressing the potential issues that may arise with modified bitumen roofing.