Not this time man. You asked why people said you were wrong. I told you why. This is why. And you are still wrong. This needs water to drain from it, not be stopped from getting in. Edit: Sorry, I’m not telling you why, which would likely help put it in perspective. This is gonna move, no matter what you do to it. That means if the joints are filled with mortar, that mortar is going to crack. Once it cracks, you have your water ingress. But where the joints didn’t crack you have a dam. That’s where the real issues are going to come from. Water trapped inside with nowhere to go.