Silicone sealant should be applied vertically on the inside and outside where the shower enclosure fixes to the tiled walls and importantly on the outside only.
Should a shower door frame be sealed with silicone underneath.
There is no other reason for adding it.
If you find frameless shower door leaks at both the sides of the glass then you will have to seal the gap between the door and the adjacent glass wall.
I always try to talk people out of using silicone on frameless enclosures of this type.
Invest in a shower door side seal to solve the leakage issue from the sides.
Grout isn t suitable for sealing around your bathtub or shower tray as it s not flexible and will crack as soon as any weight is placed on the tub or tray.
Caulk made of pure silicone or siliconized latex acrylic i e latex or acrylic caulk with added silicone adheres well to common shower and tub materials including porcelain ceramic stone.
Solutions for fixing the leaks on either side of the frameless shower door.
Silicone sealant is added to the joints between the glass and tile the perimeter to prevent leaking.
For a shower door or enclosure to work correctly it must be installed in accordance with the manufacturer s instructions.
Broadly speaking the shower tray should be level and fully sealed to the tiles before the enclosure is installed the sides of shower enclosure should be vertically plumb and fixed securely to tiled walls.
And only the outside edge on the tub or shower b.
Either way it is the inside edges on the verticles.
If i understand your question correctly we assume you are talking about a glass shower set like a neo angle shower or a glass door set on a tub.
Make sure you have silicone sealant and not normal grout.