Caulk normally used would not work because it s too large a gap.
Large gap between tile and wall.
Big box stores have them.
Also check concrete supply centers as backer rod is used to fill gaps in poured concrete walls.
Large gap between tub and tile 1 2 how to caulk.
Any gap should never be greater than 1 8 inch.
The tile council of north america recommends at least a quarter inch gap between the tile floor and the walls.
Push the appropriate size backer rod into the gap below flush with the surface.
This small gap is created by the compressed thickness of the organic mastic or the cement thinset used to attach the tile to the backer board.
Fill larger gaps with foam backer rod sometimes called spline.
Instead fill it with an elastic material capable of sustaining the movement of the floor and the movement of the wall.
Darciegage2 has the best solution.
Backer rod and caulking masking tape off the wall and tub to pull a straight line.
If your gap is smaller than 1 8 inch in width use regular caulk.
Thread tools search this thread 1 01 27 16 09 51 am b.
Caulking is the best choice for this application.
A pencil tile trim would cover the gap.
The gap is easily filled with the tile wall grout.
Fill gaps larger than 1 8 inch.
Get photos of great finish details include photos with bid and contract.
Never fill this gap with grout because tile grout is not flexible.
This can be found at well stocked hardware stores but not always at large home improvement centers.