Stone Ballast Roof

Medium mixed color decorative rock.

Stone ballast roof. Ballast stone can crush the underlying insulation creating weak spots in the roof membrane. These small stones. Large mixed color decorative rock. The weight on a ballasted roof can be from 10 to 25 pounds per square foot meaning the substructure must be designed specifically to carry more weight than other roofing systems.

Our roofing ballast is commonly installed over membrane and single ply systems at 1000 1500 pounds per square. The insulation is loose laid onto the decking. The purpose of stone or gravel ballast on a flat roof. 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.

Next the membrane is rolled over the insulation 2. 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. Firestone epdm ballasted system application. The stone ballast on a ballasted roof system is the only thing holding the roof system in place.

Unwashed landscaping decorative drainage and roof ballast stone. Ballast is required with 20 lbs s f. Stone ballast is no longer allowed by many building codes. 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.

Though primarily confined to built up asphalt roofing systems it can be applied to single ply epdm rubber based membranes as well. Ballast is assumed to be round 38 mm 1 5 in or 64 mm 2 4 in smooth stone consisting of ballast gradation sizes 2 and 4 as specified in american society for testing and materials astm d448. Stone ballast typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation. 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.

Needed at perimeters and at large penetrations. It can also be a bit challenging to find a leak with a ballasted roof system and because the stones tend to collect a lot of dirt patching it can be a bit difficult. 2 1 2 8 unwashed rock. It is not unusual to find a gravel top coat on commercial roofing systems.

There are no fasteners installed at all 3 and 4. White ballast 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. Over time the stones move around creating bald spots where the system isn t held down at all.

Additional benefits of ballast on a flat roof. White ballast can range in size from 2 1 2 3 4 inches and can be made to meet various astm standards. This again is loose so there are no fasteners or glues used to hold it down.