Identifying a water leak - insulation

[mo7]

tried the coat hanger trick by drilling a slightly larger hole and either felt a joist or clear air - so no obvious hitting of a pipe.

 

[Radioman]

tried the coat hanger trick by drilling a slightly larger hole and either felt a joist or clear air - so no obvious hitting of a pipe.

Unless you went straight through the pipe and out the other side, or just nicked it.