What should be ensured before installing tack strips on the subfloor?

Before installing tack strips on the subfloor, it is crucial to ensure that the subfloor is even and clean. An even subfloor provides a stable foundation for the tack strips, which helps to keep the carpet properly anchored without any awkward bumps or unevenness that could lead to wear or damage over time. A clean subfloor is equally important as it prevents debris or contaminants from interfering with the adhesion of the tack strips, which could cause instability or compromise the overall installation.

While the other options speak to various aspects of the installation process, they do not directly relate to the foundational requirement of preparing the subfloor appropriately. For instance, painting the tack strips could interfere with their functionality, as the purpose of tack strips is to secure carpet through sharp tacks without obstruction. Installing carpet prior to placing tack strips would not make practical sense, as the tack strips need to be in place to hold the carpet in position. Similarly, turning off heaters is not a prerequisite for the installation of tack strips; the focus should remain on the condition of the subfloor itself.