PSU Taco85
Well-Known Member
Clean out the joint as best you can, then stuff a backer rod in so it'll save a ton of caulk: Sika 3/4 in. x 20 ft. Closed Cell Backer Rod, Expansion Joint Polyethylene Foam 108130 - The Home Depot
Then use this Sika self leveling caulk: Sika 10.1 fl. oz. Sikaflex Self-Leveling Horizontal Joint Elastic Polyurethane Sealant in Gray 7116070 - The Home Depot
There is no shortcut for this fix unfortunately. This is the longest lasting method but you'll have to redo in ~10 years again or sooner in high traffic areas.
this is what I’d do. And for bigger gaps I’ve seen people use pool noodles as well. I used this method to fill in a larger crack I had in one of my sidewalks.
