A strip and plank border should be fastened to the sub-floor using?

Using 2-inch, #12 wood screws to fasten a strip and plank border to the sub-floor is appropriate due to several factors that contribute to the effectiveness and stability of the flooring installation.

Firstly, the length of 2 inches ensures that the screw penetrates deeply enough into the sub-floor material, providing a strong hold without risking damage to the finished flooring above. It is crucial to select a screw length that secures the border adequately, allowing for the natural expansion and contraction of wood materials without loosening the fastening.

The gauge of #12 indicates that the screws are thick enough to withstand the stresses of foot traffic and any other forces that may be applied over time. A thicker screw provides greater holding power, decreasing the chance of bending or breaking during installation or afterward.

Fastening the border with this combination guarantees that the flooring remains firmly attached and stable, which is essential for maintaining a quality finish and durability in a floor covering application. The other options, while varying in size and thickness, do not offer the same balance of stability and security necessary for this specific part of the installation process.