Symptoms
- Water sprays or drips from the joint behind the head
- Leak worsens when water pressure is higher
- Head itself sprays normally
- Wet wall or ceiling below an upstairs shower
Likely causes
- CommonWorn or missing plumber's tape on the threadsTape degrades over time or may never have been applied properly during installation.
- CommonCross-threaded or loosely attached headIf the head wasn't screwed on straight, it won't seal evenly around the threads.
- PossibleCracked shower arm or head housingOld metal or plastic components can develop hairline cracks that leak under pressure.
- Less commonCorroded threads on the shower armIn older homes, mineral corrosion can prevent a tight seal even with new tape.
What to do
- Turn off the water or at least confirm you can control it before disassembling anything overhead.
- Unscrew the shower head from the arm using a wrench wrapped in cloth to protect the finish.
- Remove all old tape and debris from both the arm threads and inside the head.
- Wrap new plumber's tape clockwise around the arm threads, 3–4 wraps.
- Hand-thread the head back on straight, then snug it with the wrench, being careful not to overtighten.
- Turn water on and check the joint closely for drips at low and full flow.
- If it still leaks, remove and inspect the arm and head for cracks, replacing whichever part is damaged.
Tools and parts
- Adjustable wrench
- Cloth or rag
- Plumber's tape
Shower arm or shower headSearch: “shower arm replacement”
When to call a pro
Call a plumber if the shower arm itself is cracked or corroded into the wall pipe.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.