1. Watch for new moisture
Look for a growing stain, dripping or water collecting near the route of the previously frozen line. Do not open a ceiling that looks unstable.
2. Listen for unexpected water movement
A sound of running water while fixtures are closed is useful information for the provider. It does not identify the exact break by itself.
3. Keep the shutoff accessible
Know where the property shutoff is before changing the flow through the line. If it cannot be reached safely, ask the utility or building manager for assistance.
4. Avoid open flames
The American Red Cross advises against blowtorches and other open-flame devices for thawing pipes. Damaged or inaccessible lines need professional assessment rather than improvised heating.
5. Address exposure as well as the split
Ask about the route through unheated areas and exterior walls. Repairing the failed section and reducing future exposure are related decisions, but the appropriate method depends on the property.
Safety reference: American Red Cross frozen-pipe guidance