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Home Inspector Blog

Michael Burfitt

​Internachi certified professional inspector
Halifax, nova scotia

Residential Plumbing (Part 1)

5/25/2021

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Did you know that your home has, at minimum, not one but two plumbing systems that need to be kept completely separate? They are:​
  • Water Supply System (Public or Private)
  • Drain, Waste & Vent (DWV) System (Public or Septic)

Most homes in the Halifax core are connected to Halifax Water and one of its 2 large (Pockwock & Lake Major) supply plants. It is supplied to homes in various pipes with the biggest concern being lead pipes. If your home was built before 1960 and is located on the Halifax peninsula or Dartmouth inside Highway 111 there is a chance you have lead pipes and should have them inspected. Other concerns for the home inspector are homes that use the following types of supply pipe:

Galvanized Steel
The main issue with this type of supply pipe is its age. As it has not been widely manufactured for over 60 years, the 40-to-50-year life expectancy has long since passed. The other main problem with this type of plumbing is that they will rust from the inside out, leading to low pressure, rusty water, and ruptured pipes. These pipes should be replaced as soon as possible.

Polybutylene (PB) and/or Kitec (PEX-AL-PEX)
There have been large class action lawsuits field against the manufacturers of both products alleging that they have an unacceptably high failure rate. While the internet is full of horror stories in my experience there have been very few problems with both types of pipe here in Canada and are usually the result of poor fittings. The main concerns are that if these pipes fail, they tend to catastrophically burst rather than leak and that some insurance companies refuse to insure homes with these types of pipes without some form of mitigation, up to complete replacement. I touched upon Kitec in a previous article and this type of piping is usually used in heating systems with PB a popular choice for water supply in the 1990s.  

With all that out of the way, what is a good type of pipe to use? Generally, two main types are used today: Copper (usually Type L) and Plastic (usually PEX or Cross-Linked Polyethylene). There are pros and cons to all these types of piping and a qualified contractor can advise on the best option for your home. It is very important that supply piping be kept separate from DWV piping as this can lead to serious, even fatal cross contamination. The biggest issue I see is homeowners leaving garden hoses connected when not in use: this can lead to outside water being drawn into the potable water supply and they should be disconnected when not in use.
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