Stone Ballast Roof

Roof areas subjected to different wind action require varying amounts of ballast.

Stone ballast roof.

The stone ballast on a ballasted roof system is the only thing holding the roof system in place. Stone ballast typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation. Ballast is required with 20 lbs s f. The purpose of stone or gravel ballast on a flat roof it is not unusual to find a gravel top coat on commercial roofing systems.

Ballasted roofs are durable and long lasting. Stones or concrete pavers protect the waterproofing layer from uv rays hail and foot traffic. The insulation is loose laid onto the decking. 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.

2 1 2 8 unwashed rock. The roof tends to flex a little better under the expansion and contraction of heat and cold making it a bit more durable. Click here to edit text 2 round blue gravel approx 1 1 2 3 excavated from our pond with a natural blue tint with brown and natural color hues. In windy areas ballast stone can actually blow off the roof creating projectiles below.

Contact hydrotech for specific installation guidelines. The amount of ballast varies from 50 to 65 kg m 10 to 13 psf in conventionally loose laid gravel stone ballasted single ply assemblies. Unwashed landscaping decorative drainage and roof ballast stone. Medium mixed color decorative rock.

Stone ballast is no longer allowed by many building codes. Over time the stones move around creating bald spots where the system isn t held down at all. Though primarily confined to built up asphalt roofing systems it can be applied to single ply epdm rubber based membranes as well. The firestone epdm ballasted system is an economical epdm roofing system suitable for a wide variety of buildings.

Next the membrane is rolled over the insulation 2. Ballast stone can crush the underlying insulation creating weak spots in the roof membrane. Large mixed color decorative rock. 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.

In the field of the roof a minimum of 10 lbs s f.