This document is not a how to manual on green roof.
Green roof gravel ballast.
Roofstone can also be used on roofs that must be ada compliant with slope up to 1 48 which equals 2 08 or 1 19 degrees.
The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer.
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.
1 2 in addition green roofs can reduce building energy use by 0 7 compared to conventional roofs reducing peak electricity demand and leading to an annual savings of 0 23 per square foot of the roof.
This is inch per 1 foot which is the norm minimum roof slope for drainage.
They assume a nominal selection of post codes selected to represent the infl uence of geographical variations in rainfall on thermal performance.
Ballasted roof systems are simultaneously a roofer s best friend and arch nemesis.
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.
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.
Somebody walking on the roof will undoubtedly step on the ballast and put a hole in the membrane.
The design of green roofs as well as traditional roofs.
Holes mean roof leaks and roof leaks mean call the roofer.
Gravel ballasted roofs with sikaplan or sarnafil single ply membranes are conventionally installed.
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.
Roofstone follows the roof contour and can be used to create walkways patios and landing areas on most non ada compliant roofs.
For built up roofing the gravel was generally 25 5 inches in diameter.
Slab ballast application or 0 0010 for a green roof or gravel ballast application has been assumed.
They are valid for the constructions shown in the details immediately above each table.
Simply put a ballasted roof is easy to install and basically guaranteed maintenance work for a roofer.
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.
It is recommended that the team involved in choosing a green roof provider should undertake the appropriate research.
The buildup is ballasted with a gravel layer of at least 50 mm and 80 kg m 2.
Despite the positive qualities associated with a ballasted roof system there are some challenges.
