The recommended depth for attic insulation is usually 10 14 inches.
Insulation for water pipes in attic.
Otherwise a cold water line run a long distance through a hot attic can take several.
For some homes the pipes will run underneath a subfloor or at the bottom of the attic.
For other homes the pipes might be located in the walls or the roof rafters.
Process for weatherizing pipes in exposed areas of the home such as the garage basement and exterior walls.
The drywall ceiling was insulated and the pipe was separately insulated even further as i say 360 degrees.
Shop pipe insulation here.
It is important to insulate pex pipe in an attic particularly in cold weather areas.
While pex does not ordinarily burst in the cold the water in the pipes can still freeze.
Ref insulate cold water pipes thoughtfully the frozen pipe was in the attic of the garage.
Find out where the pipes are located to see if a ladder is needed to reach them or if you will have to work on your knees installing the insulation.