News & Advice

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.