Snow melt dripping  off  the deck and through the cement under the tiles is creating soda straw stalactites. Past stalactites have reached up to 3-4 inches before breaking off and shattering on the sidewalk. Below, flowstone builds up on the sidewalk. The question is how many years of rain and snow can the deck withstand?

Do it yourself stalactites
Soda straws form as snow melt percolates through the deck.
How flow stone starts
How flowstone starts -- on the sidewalk.
snow melt drops
Snow melt drops fall from the deck.

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