Which material would typically be considered a non-rigid roofing type?

The selection of wood shingles as a non-rigid roofing type is valid because wood shingles are made from thin pieces of wood, which allow for flexibility and adaptability compared to more rigid materials. Non-rigid roofing materials are characterized by their ability to bend, conform, or move without breaking easily, which is typical for wood shingles. They can adjust slightly to the underlying structure's movements and are often chosen for their aesthetic qualities as well as their performance in certain climates.

The other materials, such as clay, aluminum, and steel, are generally more rigid. Clay tiles are heavy and solid, creating a durable but inflexible roofing system. Aluminum offers robustness and resistance to corrosion, but it maintains a firm structure that does not allow for flexing like wood shingles do. Steel, while strong and often used in commercial roofing applications, also exhibits rigidity, making it unsuitable to be classified as non-rigid.

Thus, wood shingles stand out as a roofing option that allows for a degree of movement, setting them apart as a non-rigid choice among the options presented.