poly caulk recommendation for above tile and below coping

[Jordada]

Hello all. I had my pool renovated nearly two years ago. New surface, new tiles and all new equipment. My pool contractor is here cutting out the grout that is above the tile and below the coping for the 3rd time as it has continuously cracked and fallen out. I have a cantilevered deck so I know this joint between the tile and coping moves. To make matters more complicated, the previous tile was a custom size. This wasn't realized until well after the tilework had begun. Long story short, I have a larger than normal gap between the top of the tile to the coping. Maybe this is why the grout keeps breaking and falling out? I'm not sure. Either way, I have convinced the pool contractor to try poly caulk this time around. He asked if I had read about any recommendations as far as brands/types. Apparently he has never used them for this purpose previously. Surprising considering he has been in business 20+ years. Anyway, I've been searching the forums and can't quite track down what I need. So, does anyone who has used poly caulk for this joint have a recommendation?

Thanks,
Debbie

 

[ajw22]

You can't use grout in an expansion joint. it will just crack from the movement.

You need to use flexible mastic like...

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

 

[Jordada]

An example of what I'm talking about...

 

[Jordada]

You can't use grout in an expansion joint. it will just crack from the movement.

You need to use flexible mastic like...

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

Can deckofseal be used on a vertical surface?

 

[ajw22]

Can deckofseal be used on a vertical surface?

Yes, you get the non-self leveling one.

 

[Jordada]

Yes, you get the non-self leveling one.

Thank you!

 

[cowboycasey]

He has been doing it wrong for 20 years

that is an expansion / perimeter joint and should not have used grout...

Both these will work perfect for what you need

Sikaflex®-1A

Sikaflex-1a is a premium-grade, high-performance, moisture-cured, 1-component, polyurethane-based, non-sag elastomeric sealant. Sikaflex-1a can be used in green and damp concrete applications.

usa.sika.com

DECK-O-SEAL ONE STEP - Polymer-Based Sealing Compound

#788 PDF Print Version SDS – Various Colors CSI 13 11 00 Request Sample Color […]

www.deckoseal.com

 

[ajw22]

He has been doing it wrong for 20 years

that is an expansion / perimeter joint and should not have used grout...
View attachment 363964

That diagram does not show a proper cantilevered deck expansion joint. The coping/deck cannot make contact with any part of the "concrete tank" or tiling.

The deck must be isolated from the entire pool structure as shown below,,,

Expansion Joints and Coping - Further Reading

www.troublefreepool.com

 

[cowboycasey]

I SO missed that it is a cantilevered pour.. Thank you for saving this..

 

[Jordada]

thank you both for your help.