Vacuuming Rooftop Ballast Rock

So why do roofing contractors put rock on a flat roof?

There are several reasons. The ballast (rock or gravel ) protects the waterproof membrane underneath from the blistering and cracking damage from the sun. The ballast helps weigh down the membrane to keep it in place. And, it makes the roof more energy-efficient.

Some of these industrial roofs have lasted 50 years. If and when the roof needs replacing, of course the ballast has to come off first. How do you get the ballast off the roof and what do you do with it?

We use our vacuum trucks to remove the ballast off the roof, and working with the management at the industrial site, we save it somewhere onsite. When the roof is repaired, the ballast is put back on the roof.


Blackwell’s, Inc.

Specialized Industrial Cleaning, Concrete Coatings, and Concrete Repair LaGrange, GA 706-883-6239


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