We at Urban Piping Ltd. have extensive experience with poly b in not only Calgary but Edmonton and all of Alberta and BC, we have typically found that poly b has developed leaks that come in waves, the first wave was around 1991 based on how the polybutylene was handled during production, transportation and installation.
Polybutylene was/is a very temperamental product, the reason for it springing leaks is because the molecular bonds break apart over time, it has been shown that contact with UV light can significantly speed up the deterioration of the bonds , so if after manufacturing or transportation the poly b was left out in the sun you could be at risk. That being said it is also typical for larger plumbing company’s who built multiple houses on a street to have a flat bed truck drop off all of the materials needed on the driveways, then have plumbers designated to that area work on the houses as they got to them.
We have found that smaller plumbing company’s and home builders took better care of the product probably due to cost concerns and would not purchase the poly b piping until it was needed for a specific house, thus limiting the amount of sunlight the poly b saw.
We have also found significant evidence to support that chlorine in the water system increases deterioration of the poly b, and found city’s like Calgary with high chlorine levels in the water have been affected.
We at Urban Piping Ltd. have recorded and documented enough cases to adequately state that once you get a leak you are generally affected with leaks that come every 3-6 months.