Stone Ballast Roof

Stone ballast is no longer allowed by many building codes.

Stone ballast roof. There are no fasteners installed at all 3 and 4. Single ply roofing materials aren t self adhered nor are they sealed together in any way. Stones or concrete pavers protect the waterproofing layer from uv rays hail and foot traffic. The roof tends to flex a little better under the expansion and contraction of heat and cold making it a bit more durable.

Though primarily confined to built up asphalt roofing systems it can be applied to single ply epdm rubber based membranes as well. Ballasted roofs are durable and long lasting. 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. Unwashed landscaping decorative drainage and roof ballast stone.

Ballast is required with 20 lbs s f. Over time the stones move around creating bald spots where the system isn t held down at all. In windy areas ballast stone can actually blow off the roof creating projectiles below. 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.

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. Next the membrane is rolled over the insulation 2. In the field of the roof a minimum of 10 lbs s f. 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.

Roof areas subjected to different wind action require varying amounts of ballast. Needed at perimeters and at large penetrations. Ballast stone can crush the underlying insulation creating weak spots in the roof membrane. 2 1 2 8 unwashed rock.

The stone ballast on a ballasted roof system is the only thing holding the roof system in place. The insulation is loose laid onto the decking. 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. Contact hydrotech for specific installation guidelines.

Large mixed color decorative rock.