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I can't quite tell from the photo but is the render around the meter box rather than the meter box on top? If it is I'd have thought taking it off, fresh render and a new box fixed to the surface would help.
With the silicon thing don't put any at the bottom so the water that gets in has somewhere to drain and perhaps chip off a bit
of render at the bottom so the meter box has a big gap to encourage drips?
jellybaby
apc
So, think I've found the culprit of our damp patch indoors..
The patch lines up perfectly with the position of the gas meter outside, after it rains it gets worse inside
I reckon the gas meter is trapping water behind it at the bottom, saturating the rendering and coming through inside.
Whats the solution here? Silicone the gap between the gas meter and the wall? I might bodge a water proof cover to stop rain going down the back of the gas meter to test, but I have a feeling water will naturally condense behind it too..