I was asked to remove a section of external fibre cement sheeting to allow the plumber to find a suspected slow gas leak. They weren't able to find it there and pressure tested other areas without luck. In the end, they decided to run a new gas line back to the meter.
The next day, before refitting the section of board I was asked to remove a now disconnected copper gas pipe section that protruded out in the corner. Once cut I couldn't get the small 20mm piece of pipe out through the stud hole, which had me suspecting I had found the origin of the gas leak.
A thin 16Ga brad fixing the external sheet had pierced through 12mm of fibre cement, then about 15mm of hardwood stud and through the copper gas pipe. I wouldn't have thought that gauge brad could do it but it did.
So, a reminder always consider what might be behind a wall your drilling, screw driving or shooting nails into
