Filling in the Gaps Between Bathroom Tiles

This page is the CodyCross answer for the clue below from Treasure Island, Group 1024, Puzzle 5 (Captain Smollett).

Question is: Filling in the Gaps Between Bathroom Tiles

and the answer is: GROUTING

Word Meaning:

GROUTING — present participle and gerund of grout

Definitions from Wiktionary.