Concrete patio coming away from pool lip

[SeeSharped]

Hi there, hope this post finds you well.

I have an old gunite pool, the previous owners put a stamped concrete deck in all around. On the far side, the concrete has settled and a gap has shown. I just want to confirm this is purely cosmetic and doesn't put the pool's structure in any danger. Only other thing to note is that there is a foam like material that appears to line the pool if i stick my hand in the crack. Not sure what that is for, just want to make its ok that it is "exposed" to the elements.

Appreciate any help you can provide!

 

[ajw22]

That is your pool expansion joint. The pool and deck ae designed to move independently as separate structures. It is more likely the deck sunk as you can see the cracks in the deck.

Expansion Joints and Coping - Further Reading

www.troublefreepool.com

The pool expansion joint should be filled with foam backing rod and a flexible mastic sealer like Deck-O-Seal.

DECK-O-SEAL - Polysulfide-Based Joint Sealant

Seal all cracks and joints with DECK-O-SEAL two-part, elastomeric, polysulfide-based joint sealant. DECK-O-SEAL is used for caulking and sealing joints subject to concrete movement to provide a firm, flexible, weather-tight seal. It is ideal for sealing joints around swimming pools, and for...

www.deckoseal.com