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The image below shows the slabbed area I can see from my work window

Outside my window

Whenever it rains some of the slabs stay dry however, it is never consistent which ones. Can anyone explain why this happens to satisfy my curiosity?

Kingsley-James
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1 Answers1

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If the OP had not mentioned that it is not consistently the same tiles that stay dry, I would have tended to agree with @anna v's conjecture about tiles being tilted. However, in view of this OP's remark, let me speculate that those tiles stay dry which have deeper seams around them, so water runs off from them more efficiently. The depth of the seams can change from time to times because pedestrians might transfer dirt with their feet from one place to another.

EDIT (08/26/2019): One more reason in favor of my speculation: in several places, there are narrow dry strips along seams.

akhmeteli
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