Which of the following is a requirement for the use of FM 4474 in roofing?

The correct answer highlights that for the use of FM 4474 in roofing, there is a specific recommendation regarding the absence of exposed fasteners. FM 4474 pertains to the evaluation of roofing systems focusing on their wind resistance, particularly for low-slope membranes. Utilizing systems without exposed fasteners can significantly enhance wind uplift performance because they reduce the number of potential points of failure that can be affected by wind forces.

The rationale behind this requirement is to ensure that the roofing assembly provides optimum performance under challenging weather conditions, specifically high winds. When fasteners are exposed, they can be at risk of being dislodged or damaged, leading to a compromised roofing system. Therefore, adhering to the guideline of using materials or assembly techniques without exposed fasteners can contribute to the overall integrity and durability of the roofing system assessed under FM 4474.

In contrast, the other options do not represent the fundamental requirement associated with FM 4474. The standard is utilized for both low-slope and some steep-slope applications and is not limited to residential projects. Testing is an integral part of the certification process but does not directly relate to the specific requirement of using materials without exposed fasteners.