grout gap above worktops

[DERBER]

Always leave a gap, 2mm spacer pegs, so easy. for an average sized splashback probably adds a few minutes to ya time. why take chances.
also round windows, architraves. leave a gap, then Silicon.............

 

[worktops]

we advise using Silicon as it allows some flex in the worktop and/or walls as the building expands and contracts as the seasons change. the sealant will give this movement and provide a watertight barrier.