Broken sprinkler pipes can be a very serious problem. On a most recent project, cold weather caused over $1 million in damages from a single 6 inch pipe in the attic of a 4 story building. It caused major floor and ceiling damage to 3 residences and caused the ceiling in the lobby to collapse. The break was due to poorly insulated plastic sprinkler pipes in the attic. Two recent breaks had similar installation defects even though both were previously “fixed” (or so believed).
The repairs in both cases involved removing some insulation from the attic between the pipe and warm building interior. To keep the pipes from freezing, it is critical to allow heat from the interior to reach the pipe. Removing insulation between pipes and interior space will allow the area to be warmed. Be sure to ADD insulation between the pipes and the cold attic space.
It’s a good idea to check the attic to make sure your pipes are insulated properly, but be aware…adding more insulation may NOT get the job done.