PaulJ-R

I think a small aluminium channel would be a better solution. We had a similar request from an architect for a Rail Station a few years back If: 1. Insulation/heat loss is of no concern 2. You are OK with having to smash the glass in case of future removal 3. The masonry is existing - already built Then consider cutting a channel into the wall and fixing a small aluminium channel into the wall both sides, install your glass - 6mm toughened as a minimum, 10mm might be better. The channel will need to have enough depth to all the glass to go into one and then pass into the opposite. You will have to use silicone sealant on one of the faces to fix the glass location. To source your materials look at wetroom glass shower partitions I