Gravel Ballast Green Roof

Holes mean roof leaks and roof leaks mean call the roofer.

Gravel ballast green roof.

The gravel used in built up roofing what the roofing contractors were used to was not the same as that used in a ballasted roof. Despite the positive qualities associated with a ballasted roof system there are some challenges. Too much gravel can result in a structural issue due to weight. The single ply membrane and other roof components including thermal insulation are loose laid.

Roof gravel provides a protective layer to flat roofs reducing the weather damaging effects from uv rays and heavy snow hail and wind. It is very important to note that the amount of gravel being applied to a roof must be precise it depends on the specific roofing spec being used and the building type. Ballasted green systems roof materials for ballasted green systems a ballasted gravel paved roof will generally require a stronger supporting structure than that for the exposed membrane one but will allow the roof to be used as a trafficked or leisure use area. Ballasted roof systems are simultaneously a roofer s best friend and arch nemesis.

The gravel in a ballasted roof helps absorb heat preventing the sun from heating the roof materials below and making the roof more energy efficient. Gravel ballasted roofs with sikaplan or sarnafil single ply membranes are conventionally installed. For built up roofing the gravel was generally 25 5 inches in diameter. Our roof gravel is available for delivery in tunnel lift bulk bags allowing an easy method of transporting the gravel onto a roof using a crane not provided.

The buildup is ballasted with a gravel layer of at least 50 mm and 80 kg m 2. The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer. Simply put a ballasted roof is easy to install and basically guaranteed maintenance work for a roofer.