The minimum allowed by code is 10 psf.
Epdm ballasted roofing system.
Depending upon the object and the membrane thickness epdm can puncture.
Although a ballasted epdm fully adhered roof comes really close.
Drawbacks of a ballasted roof system.
Epdm ballasted roofing system.
Extremely difficult to find a leak in this system since the membrane is well hidden.
No roofing system is 100 resistant to everything.
This is when the roof membrane is held in place by aggregate.
Adds a lot of weight to the roof system typically 10 15 pounds per square feet.
Ballast stone fractures and gets sharper over time which can puncture the.
Firestone epdm ballasted system application.
It is most commonly used on large open roofs without many penetrations such as a warehouse.
Ballast stone traps a lot of dirt making patching difficult.
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.
In fact the weight for a ballasted roof can range from about 15 pounds per sf psf to about 25 psf.