Despite the positive qualities associated with a ballasted roof system there are some challenges.
Green roof gravel ballast.
Holes mean roof leaks and roof leaks mean call the roofer.
The buildup is ballasted with a gravel layer of at least 50 mm and 80 kg m 2.
Too much gravel can result in a structural issue due to weight.
Slab ballast application or 0 0010 for a green roof or gravel ballast application has been assumed.
Gravel ballasted roofs with sikaplan or sarnafil single ply membranes are conventionally installed.
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.
This is inch per 1 foot which is the norm minimum roof slope for drainage.
This document is not a how to manual on green roof.
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.
Simply put a ballasted roof is easy to install and basically guaranteed maintenance work for a roofer.
Magazine and roofing southwest although single ply roofs inherently have sun protective qualities ballast provides an extra layer of protection from uv rays.
They assume a nominal selection of post codes selected to represent the infl uence of geographical variations in rainfall on thermal performance.
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.
They are valid for the constructions shown in the details immediately above each table.
The single ply membrane and other roof components including thermal insulation are loose laid.
The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer.
This research should include reviewing the complexity and size of green roofs.
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.
Somebody walking on the roof will undoubtedly step on the ballast and put a hole in the membrane.
Ballasted roof systems are simultaneously a roofer s best friend and arch nemesis.
For built up roofing the gravel was generally 25 5 inches in diameter.
The design of green roofs as well as traditional roofs.
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.
Roofstone follows the roof contour and can be used to create walkways patios and landing areas on most non ada compliant roofs.
