How many successive doubled studs can be bored in non-bearing partitions according to conventional light-frame construction?

In conventional light-frame construction, non-bearing partitions typically use doubled studs to provide the necessary support for various components such as drywall. The design allows for some flexibility, but code and practical considerations dictate limitations to ensure structural integrity and performance.

The correct answer, which states that two successive doubled studs can be bored, aligns with recognized building practices. Boring more than two successive doubled studs can significantly weaken the wall's overall strength and stability. Each bore creates a point of potential structural weakness, and with non-bearing walls, it is essential to balance the need for running services, like electrical wiring or plumbing, with maintaining adequate support and load redistribution.

This limitation helps prevent issues like wall sagging or failure, ensuring safety and durability. In contrast, allowing an unlimited number could lead to excessive weakening and potential failure of the partition. Having only one or three doubled studs would not provide the necessary combination of strength and flexibility; thus, two is an optimal and widely accepted standard in practice.