3mm very dusty 6mm most popular and 10mm too coarse easy to puncture roof covering when walking on them. Considering the different sizes of lime chippings available the depth is irrelevent you need to make sure the roof is completely covered most flat roofers work on 1 bag of chippings covering 3 square metre s the most common sizes are. To protect the underlying layer of roofing materials as is the case with built up roofs burs.
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