News & Advice

News & Advice

What Are The White Stones On Flat Roofs?

What Are The White Stones On Flat Roofs

They are often referred to as “gravel ballast.”

These stones serve several purposes…

  1. Protection – Gravel ballast protects roofing material and extends its lifespan.
  2. Weight distribution – Gravel on flat roofs prevents wind uplift.
  3. Heat reflection – White stones reflect sunlight, reducing roof heat absorption. This lowers cooling costs and minimizes heat transfer into interior spaces.
  4. Fire protection – Gravel ballast can provide some level of fire protection for the roof by acting as a barrier between the roofing material and any potential ignition sources.

Overall, gravel ballast is a common feature of flat roofs and serves multiple functional purposes in protecting and maintaining the integrity of the roofing system.


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