What is the standard size for cut stringers used for stairs?

The standard size for cut stringers used for stairs is 2x12 lumber. This size is commonly used because it provides the necessary strength and width to support the stairs effectively. The dimensions of a 2x12 stringer allow it to adequately handle the load of foot traffic and any additional weight that may be applied.

Using a 2x12 also enables the stringer to accommodate the rise and run of the stair treads adequately while ensuring that the angles cut for the stringers are structurally sound. This size provides enough material to secure the treads properly and prevents sagging over time, which is essential for both safety and longevity of the stairs.

Other lumber sizes may not offer the same level of strength and structural integrity required for cut stringers, which is why the 2x12 option is the preferred choice in most building codes and practices for residential and commercial stair construction.