In roofing terminology, what does the "Truss Quantity" impact?

The term "Truss Quantity" refers to the number of trusses used in the construction of a roof. The quantity of trusses significantly impacts both the stability of the roof and the cost of roof installation.

In terms of stability, an appropriate number of trusses can help distribute loads evenly across the roof structure, providing necessary support and strength to handle various external factors such as wind, snow, and other environmental loads. Insufficient or poorly spaced trusses can lead to structural weaknesses, resulting in potential failure of the roof system.

From a financial perspective, the quantity of trusses directly influences the overall cost of roof installation. More trusses require additional materials, labor for installation, and increased planning considerations. Consequently, a project with a higher truss quantity typically incurs higher costs.

Given this understanding, the correct answer indicates that truss quantity affects both aspects, making the option that encompasses both the roof's stability and the installation cost the most comprehensive and accurate choice.