Yes wind chill will be the thing. If its sheltered water does not always
freeze all the way through the pipe.
Brian

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"The Natural Philosopher" wrote in message
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On 20/01/2021 15:02, R D S wrote:
We've a 15mm plastic mains water pipe on an outside wall.

I haven't got around to lagging it yet so as a precaution i've been
turning it's supply off in the evening and had been expecting to open it
up and find it frozen.

Having had no bother and it being zero and under recently around these
parts i'm wondering at what sort of temperature you'd actually get
freezing?

I realise that rather than debating this, a better use of my time would
be to go and get some lagging!

below zero with no flow and wind.

I had a radiator freeze INSIDE a cottage once


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