There are no fasteners installed at all 3 and 4.
Stone ballast roof.
It is not unusual to find a gravel top coat on commercial roofing systems.
Ballasted flat roofs are a popular choice especially for commercial buildings.
This again is loose so there are no fasteners or glues used to hold it down.
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.
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.
Ballast stone can crush the underlying insulation creating weak spots in the roof membrane.
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.
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 stone ballast on a ballasted roof system is the only thing holding the roof system in place.
In windy areas ballast stone can actually blow off the roof creating projectiles below.
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.
White ballast can range in size from 2 1 2 3 4 inches and can be made to meet various astm standards.
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.
Unwashed landscaping decorative drainage and roof ballast stone.
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.
Stone ballast is no longer allowed by many building codes.
Medium mixed color decorative rock.
Published by justin on september 19 2019 september 19 2019.
Our roofing ballast is commonly installed over membrane and single ply systems at 1000 1500 pounds per square.
Firestone epdm ballasted system application.
The purpose of stone or gravel ballast on a flat roof.
Though primarily confined to built up asphalt roofing systems it can be applied to single ply epdm rubber based membranes as well.
Stone ballast typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation.
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.
These small stones.
Needed at perimeters and at large penetrations.
Next the membrane is rolled over the insulation 2.
The insulation is loose laid onto the decking.
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.
