Coping-Caulk Issue

pd417

Member
Jan 24, 2012
17
Our inground pool is about 8 years old and have had no problems with it.
Recently I noticed that the coping/caulk used between our stamped cement patio
and the flagstone edge of the pool is cracking. I'd like to repair and/or replace this, but I don't
know what type of product it is. When our contractor was building the pool, if I recall, the
product came in a standard size caulking tube, they then sprinkled fine sand on while it was still
wet. I'm assuming this is so if there is any movement in the patio, it won't crack the pool edge.

See attached photo.

Does any know what this product is?
 

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ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
22,094
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
I suspect it is your pool expansion joint but I can't tell from such a close picture. For a pool expansion joing you need to use a flexible mastic.

Use a foam backing rod in the joint and then...


or


 

pd417

Member
Jan 24, 2012
17
Allen,
Thanks for the quick reply.

Can I repair the expansion joint with Sikaflex or do I need to remove the old material first?
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
22,094
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
For a lasting fix that looks good you need to clean out the joint of the old materials. It is tedious work bent over on your knees.
 

Dirk

Gold Supporter
TFP Guide
Nov 12, 2017
8,346
Central California
Pool Size
12300
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
I'm hoping my new Dewalt Multi-tool is going to make that task either for me (the removing) this next time around. I'm due. I last used a Lowe's generic "Sikaflex" and regret that. It didn't last very long at all, and it didn't float (self-level) like it was supposed to. I digress.

The product Allen suggests might very well be the right stuff, but I would call Sikaflex directly and ask. They have many products. Tell them it is for a pool expansion joint, horizontal, and subject to splashing and some salt, and see if they recommend their "1A" or something better. (Or maybe Allen already did that?) Maybe they have a new product? Play it safe, they would know best.

Believe me, the longer it lasts, the less you have to replace it, the happier you'll be!
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
22,094
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
I prefer deck-o-seal then sikaflex for the reasons @Dirk described. But deck-o-seal is more expensive.
 

Dirk

Gold Supporter
TFP Guide
Nov 12, 2017
8,346
Central California
Pool Size
12300
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
That's the name I couldn't remember! I'm going to try Deck-o-Seal next time. It's gotten "good press" here on TFP.