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Hello,
Im after some advice. I have put in a small retaining wall to act as a step down off a concrete slab to get a better slope for turf.
I used Versalock blocks, Originally I planned for a small gap but as the slab was already down, I was governed by Versalock block sizes which meant the gaps on both sides are different. One gap is 120mm the other is 70mm. My question is what should I fill this gap with Concrete or Mortar? To me it feels like a case of too small for concrete but too big for mortar which could crack. Im leaning towards Concrete. But again I would be thinking Expansion join foam one Versalock block side , possibly the other? Thoughts?
