Green Roof Gravel Ballast

Too much gravel can result in a structural issue due to weight.

Green roof gravel ballast.

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. Gravel ballasted roofs with sikaplan or sarnafil single ply membranes are conventionally installed. The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer. Magazine and roofing southwest although single ply roofs inherently have sun protective qualities ballast provides an extra layer of protection from uv rays.

It is recommended that the team involved in choosing a green roof provider should undertake the appropriate research. Roof gravel provides a protective layer to flat roofs reducing the weather damaging effects from uv rays and heavy snow hail and wind. Despite the positive qualities associated with a ballasted roof system there are some challenges. Holes mean roof leaks and roof leaks mean call the roofer.

They are valid for the constructions shown in the details immediately above each table. The design of green roofs as well as traditional roofs. Slab ballast application or 0 0010 for a green roof or gravel ballast application has been assumed. Green roof temperatures can be 30 40 f lower than those of conventional roofs and can reduce city wide ambient temperatures by up to 5 f.

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 gravel in a ballasted roof helps absorb heat preventing the sun from heating the roof materials below and making the roof more energy efficient. 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. This document is not a how to manual on green roof.

It also provides protection from foot traffic. Somebody walking on the roof will undoubtedly step on the ballast and put a hole in the membrane. Simply put a ballasted roof is easy to install and basically guaranteed maintenance work for a roofer. For built up roofing the gravel was generally 25 5 inches in diameter.

Ballasted roof systems are simultaneously a roofer s best friend and arch nemesis. They assume a nominal selection of post codes selected to represent the infl uence of geographical variations in rainfall on thermal performance. 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. The single ply membrane and other roof components including thermal insulation are loose laid.