Chippings can be used provide a ballast layer to help hold down the roof surface in exposed locations.
Garage roof chippings.
To protect the underlying layer of roofing materials as is the case with built up roofs burs.
Gravel is used on flat roofs for two reasons.
If the garage roof is already constructed of roofing felt gather some loose mineral chippings.
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However the chippings can move around or conceal defects in the roof and should not be walked on as they may puncture the membrane.
Chippings should only be used on roofs at less than 10 as complete adhesion at steeper pitched is not possible.
Have you ever wondered why contractors install gravel on flat roofs.
The chips act as a barrier between non solar reflective felt and the sun basically help prolong its life span of the felt if its green mineral on your new roof you will not have to chip it as the minerals are solar reflective.
The purpose of gravel on a flat roof.