What are ballasted roofing systems primarily held in place by?

Ballasted roofing systems are primarily held in place by heavy materials, such as gravel or pavers, which provide the necessary weight to keep the roofing membrane securely anchored to the roof deck. This method of securing the roofing system takes advantage of the gravitational force of the heavy materials, which counteracts the effects of wind uplift and other forces that might otherwise displace the roofing material.

The use of ballasting materials like gravel or pavers also offers additional benefits, such as protection against UV radiation and foot traffic, and can aid in water drainage. In regions where direct attachment or adhesion of the roofing membrane may be impractical, ballasted systems provide an effective alternative that enhances both stability and durability.

Other methods, such as mechanical fasteners or adhesive substances, either involve different types of roofing systems or serve different functions that do not pertain directly to ballasted systems.