Additional benefits of ballast on a flat roof.
Stone ballast roof.
In the field of the roof a minimum of 10 lbs s f.
Published by justin on september 19 2019 september 19 2019.
Ballast stone can crush the underlying insulation creating weak spots in the roof membrane.
Our roofing ballast is commonly installed over membrane and single ply systems at 1000 1500 pounds per square.
The purpose of stone or gravel ballast on a flat roof.
This again is loose so there are no fasteners or glues used to hold it down.
These small stones.
Though primarily confined to built up asphalt roofing systems it can be applied to single ply epdm rubber based membranes as well.
White ballast a1 grit ballast is a natural smooth water worn and screened large gravel used for many applications.
Needed at perimeters and at large penetrations.
Over time the stones move around creating bald spots where the system isn t held down at all.
White ballast can range in size from 2 1 2 3 4 inches and can be made to meet various astm standards.
Firestone epdm ballasted system application.
Medium 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.
Stone ballast is no longer allowed by many building codes.
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.
It is not unusual to find a gravel top coat on commercial roofing systems.
In windy areas ballast stone can actually blow off the roof creating projectiles below.
Unwashed landscaping decorative drainage and roof ballast stone.
2 1 2 8 unwashed rock.
Large mixed color decorative rock.
The insulation is loose laid onto the decking.
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.
The stone ballast on a ballasted roof system is the only thing holding the roof system in place.
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.
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.
There are no fasteners installed at all 3 and 4.
Ballast is required with 20 lbs s f.
Stone ballast typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation.
Next the membrane is rolled over the insulation 2.
