Leak from shower/tub?

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GYK

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We have a bathroom on the second floor and there was a old leakage happened years ago. It has been fixed and there are old water stain on the ceiling right beneath the shower/tub.

When I does random moisture check recently (General Tools Moisture Meter, pinless), the relatively humditiy on the ceiling under the tub (a different spot) is +60% after shower, other areas are 0%-6%.

There is no new water stain, no leakage, no water dripping found in past 4 years. I am wondeirng if it means a hidden water leakage?We had a plumber coming in Sept last year for other issue, he did visual check for that area and told us everything is ok. Should we worry too much for this? We don't want to dig a hole on the ceiling if it's not necessary.

Thanks for your suggestion and advice.
 
You can very well have a small leak in the ceiling that is causing dampness
but is not big enough to saturate the sheet rock.
cut the sheet rock out below the shower, in the area your detector is detecting dampness.
then run the shower while inspecting for a small leak.

it could be
drain
over spray on the floor
leaking tile joint
or leak around the valve

good luck, post back when you find it
 
Hi Frodo, thank you very much.

I checked the same spots again after about 10 hours and the humidity changed back to 0%. Does it mean the leak dry automatically?
We also found the tub sprout doesn't work well recently, is it another possible cause?

Thanks.
 
Hi Frodo, thank you very much.

I checked the same spots again after about 10 hours and the humidity changed back to 0%. Does it mean the leak dry automatically?
We also found the tub sprout doesn't work well recently, is it another possible cause?

Thanks.


you have a little leak that drys up between showers
keep an eye on it, it will only get worse with time


intermission

 

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