What should the knee kicker's pins penetrate during installation?

The correct answer is that the knee kicker's pins should penetrate the carpet's primary and secondary backings during installation. This is essential because it ensures that the carpet is firmly secured to the underlying layers, providing stability and preventing unnecessary movement.

The primary backing is the layer that gives the carpet its structure and durability, while the secondary backing typically serves to enhance this support and often provides additional moisture resistance. By ensuring that the pins penetrate both these backings, the installer can create a more secure bond that contributes to the overall longevity and performance of the carpet.

In contrast, while it may seem relevant for the pins to penetrate the carpet's padding or other layers, the focus during installation should be on the backings, as this is where the most effective anchoring occurs to maintain the carpet’s integrity and appearance over time.