Rock Ballast Roof

In gravel ballasted roofing systems the waterproofing membrane is covered and ballasted against wind uplift and other exposures with a layer of gravel.

Rock ballast roof.

A complete line of custom prefabricated accessories is available for the designer series membranes. The ballast is used to keep the roofing system cool and of out of the sun s harmful rays thus keeping energy costs down. Stone ballast typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation. The shingle ply membrane is printed with a shingle design in sandstone tan or slate gray.

A ballasted roof means that the roof membrane is not anchored or adhered in any way to the decking material. Conventional gravel ballasted roofs have been built for many years and are suitable on most flat roofs and structures. A1 grit ballast is a natural smooth water worn and screened large gravel used for many applications. In the field of the roof a minimum of 10 lbs s f.

Our roofing ballast is commonly installed over membrane and single ply systems at 1000 1500 pounds per square. In windy areas ballast stone can actually blow off the roof creating projectiles below. When the concept first came to the u s plenty of roofers scratched their heads and wondered how the roof stayed on without being anchored especially during high winds or storms. Ballast stone can crush the underlying insulation creating weak spots in the roof membrane.

Single ply roofing materials aren t self adhered nor are they sealed together in any way. Despite the positive qualities associated with a ballasted roof system there are some challenges. The gravel top coat is also extremely resilient to heavy foot traffic and high wind scenarios. The rock ply membrane is printed with the appearance of a ballast roof.

Contact hydrotech for specific installation guidelines. Over time the stones move around creating bald spots where the system isn t held down at all. It is however ballasted generally with gravel. Ballast is commonly used with roofs made of tar and gravel roof alternatives including ethylene propylene diene monomer epdm polyvinyl chloride pvc and thermoplastic polyolefin tpo single ply flat roofs.

Needed at perimeters and at large penetrations. Roof perimeters and penetrations are flashed in accordance with firestone specifications pdf. Once completed the epdm membrane is held in place using one of the following materials as ballast with a minimum weight of 50 kg m. Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm.

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