Lead is used as a waterproof barrier, Gav. It doesn't "breathe". There's always a certain amount of movement with lead from the weather, particularly the wind. Also from thermal expansion/contraction. These are some of the reasons why lead is never laid in lengths of more than 1.5 metres. Clean lead should properly be treated with "Patination Oil" to keep...
Rather silly reason for asking. Mother was told that it is to let it breath. My brother who has a DIY business thought that it was rubbish and through a strop!
Well Gavmacp, I can honestly sa, I have come across a lot of lead pipes over the years that have been painted, underneath that paint the lead has been bright silver and as clean as the day it was made into a pipe!
Lead is used as a waterproof barrier, Gav. It doesn't "breathe".
There's always a certain amount of movement with lead from the weather, particularly the wind. Also from thermal expansion/contraction.
These are some of the reasons why lead is never laid in lengths of more than 1.5 metres.
Clean lead should properly be treated with "Patination Oil" to keep its appearance, and resist discolouration.
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