What type of screws are used for securing back-to-back headers through each sheathing to each jack and king stud?

Using No. 8 screws for securing back-to-back headers through each sheathing to each jack and king stud is based on their size and strength characteristics that suit this application. No. 8 screws are typically used in applications requiring medium-strength fastening. They provide adequate holding power for the connections without the risk of causing excessive splitting of the wood components, which can happen with larger screws.

In this context, when installing headers that support load-bearing walls, it's essential to choose screws that not only securely connect the materials but also maintain the integrity of the wood structure. No. 8 screws strike the right balance between strength and size, ensuring that the headers are firmly attached to the studs while allowing for the wood components to maintain their structural integrity.

In framing applications, using appropriately sized screws helps to ensure a strong connection and adherence to building codes, which is essential for the safety and stability of the structure.