Which material property is not considered a characteristic of building materials?

The age of a material is not considered a fundamental property of building materials, whereas weight, color, and price are essential characteristics that influence the choice of materials in construction.

Weight is important for structural integrity, as it affects the load-bearing capacity of a structure. Color can influence aesthetic appeal and energy efficiency, especially in regards to heat absorption and reflection. Price is a critical factor in project budgeting and financial planning, as different materials come with varying costs that can impact the overall project budget.

While the age of a material can certainly affect its performance—such as durability or potential degradation—it is not an intrinsic characteristic of the material itself like the other properties. Age can be variable and dependent on the specific context rather than a defining quality, which is why it does not fit into the primary characteristics used when evaluating building materials.