Expansion grout gap

[GlasgowMan]

The flexibility of the grout is more for deformation than lateral. If your happy to Silicon first then do that. I was just saying it wasn’t a necessity or as you say put something temporary in

I think I’ll leave the Silicon, line thin bits of wood down the side. Grout right upto the wood and wait for grout to harden then take out wood. Just hope it doesn’t break up the grout at the edges.