Which roofing material should NOT be installed on slopes below 1 in 12?

Mineral surfaced roll roofing is typically not recommended for installation on slopes below 1 in 12 due to its water-shedding capabilities. This material relies on a certain degree of slope to effectively drain water and prevent ponding. When installed on flatter surfaces, there is an increased risk of water accumulation, leading to potential leaks and water damage.

In contrast, other materials, such as metal panels, fiber cement shingles, and clay tiles, can often be used more effectively on low-slope applications because they are designed to handle water runoff differently. For example, metal roofing can be installed at lower slopes with appropriate sealing techniques, while fiber cement shingles can also manage water runoff efficiently even at lower slopes. Clay tiles, while traditionally installed on steeper pitches, can sometimes be adapted for low-slope applications with proper installation methods.

Therefore, among the given choices, mineral surfaced roll roofing is the least suitable for slopes below 1 in 12.