Just spotted some greern flakey residue on the stubby copper pipes that come out of the floor into a first floor radiator. i.e. just under the valve. I've got it on two rads. I can't feel any water but could it be the start of a leak or is it something else?
Painters10
It's most likely a very slow leak, ie water is slowly leaking but evaporating before you can detect it, leaving residue. The green stuff is the effect of corrosion on copper.
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