Bathroom · fix it
Moldy shower caulk? Here's what to do first
Peeling caulk lets water into the wall. The step almost everyone skips is removing every last trace of the old bead before the new one goes on.
Safe to DIY
Most homeowners can handle this with basic tools by following the steps below.
Beginner About 90 min
Video: Robert Murphy, The Flood Nerd (YouTube)
What to do, in order
- Step 1: Cut and scrape out all the old caulk with a caulk removal tool or a plastic razor.
- Step 2: Wipe the joint with rubbing alcohol or acetone so no silicone film remains.
- Step 3: Let the joint dry completely — a full day if the shower has been in use.
- Step 4: Run one steady bead of 100% silicone kitchen-and-bath caulk into the corner.
- Step 5: Tool it smooth with a wet finger and keep the shower dry for the cure time on the tube.
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