Painting it black let’s the soil know that that neighborhood belongs to a different gang, so the soil is less likely to wanna move in
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It’s a bonding agent known as primer (bitumen coat) for the application of waterproofing membrane. Polybit is the bitumen coat we use in our site.
It’s called damp proofing. They might be also putting dimple board over it when they are done.
Water proofing barrier to prevent moisture buildup.