Un-insulated pipes exposed to freezing temperatures are likely to become blocked with ice.
This commonly occurs in cold un-insulated attic spaces. Garden taps are also prone to freezing.
You may not be aware of the problem until the water refuses to flow when you turn on a tap.
Trace the location of the blockage by following the run of the frozen pipework.
Warm the pipe gradually, working back from the affected tap or valve.
Treat old lead pipe in the same way, but warm the whole pipe evenly.
If you cannot use a hairdryer, wrap the frozen pipe in hot towels. ·
Insulate vulnerable plumbing to prevent it freezing again.
You can buy lagging bandage to wrap round the pipework, but the job is much easier using foamed plastic tubes split lengthwise to fit over standard size pipes.