Gravel Ballasted Roof System

Roof materials for ballasted green systems.

Gravel ballasted roof system.

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. Ballast is a different style of gravel which is applied to single ply roofing systems. Insulation as an acceptable substrate for gaf roof systems. The buildup is ballasted with a gravel layer of at least 50 mm and 80 kg m 2.

There are two main types of burs or tar and gravel roofing systems modified bitumen roofs which are a mix of asphalt and rubber with a layer of gravel on top and ballast roofing which is a different style of larger gravel applied on top of a single ply roofing system. Holes mean roof leaks and roof leaks mean call the roofer. For built up roofing the gravel was generally 25 5 inches in diameter. Most ballasted roof systems use gravel stone that is similar to what would be used in landscaping.

However other ballasted systems use pavers which are easier to walk on and can be. Gaf energyguard insulations must be used in roofing systems to be guaranteed by gaf. Fully ballasted application ballast paver has been wind tunnel tested at colorado state university and far exceeds the performance of gravel ballast and other paver systems. For all systems the top layer may be a cover board as follows.

Ballasted green systems. The firestone epdm ballasted system is an economical epdm roofing system suitable for a wide variety of buildings it can be applied on any building that can accommodate the extra load of the ballast and where the roof slope does not exceed 10. Although the primary purpose of ballast is to weigh down the roofing materials it also offers similar protective benefits as described above. For ballasted systems a minimum of two layers of insulation are required for extended length guarantees.

Ballasted roof systems have been installed since the early 1970 s. Gravel on a ballast roof system. 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. Simply put a ballasted roof is easy to install and basically guaranteed maintenance work for a roofer.

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. Firestone epdm ballasted system application. Gravel ballasted roofs with sikaplan or sarnafil single ply membranes are conventionally installed.

They are known for their installation speed and pleasing aesthetics.