Workshop plan
Step-by-step instructions
1
Step 1
Measure the gap at several heights and check whether the wall is plumb or the vanity is out of level.
2
Step 2
Cut a filler wider than the largest gap and mark the wall contour with a compass or scribing tool.
3
Step 3
Trim to the line in several passes, then test-fit with the vanity doors and drawers open.
4
Step 4
Seal the filler edges, fasten it to the cabinet side rather than the wall, and leave a flexible bathroom seal at the wall joint.
5
Step 5
Inspect for movement and recaulk only after the surfaces are clean and dry.
Safety check
Do not use caulk to hide an active leak or a moving vanity. Repair plumbing and secure the cabinet before sealing the joint.
