Last week, hundreds of Toronto residents were left without water because the water lines had frozen. So how’d this happen? You may not think about it, but pipes in your home need protection from the cold winter weather too. As water freezes it expands, putting tremendous pressure on whatever is containing it (including plastic or metal pipes). By taking preventative measures before the cold weather hits, you can prevent water lines from freezing and the costly damage that comes with them.
Frozen Water Lines
Frozen external water lines are caused by frost getting deep into the ground. Unfortunately, there isn’t really anything we can do to prevent that from happening (except maybe move to a warmer climate… Bahamas anyone?) The good news when it comes to external pipes freezing, if there is good news, is that there is no damage to your home… You just have no water. Frozen water lines can also cause damage inside your home, when the water lines inside the house freeze and then burst open.
Chances are, if your basement is unfinished you will see water lines running against an outside wall. Although the wall may be cold to the touch, the water lines are exposed to the warmth of the home. When the heat is on in the house, there is enough heat to keep the water lines from freezing.
Insulation & Water Lines 101
When water lines are exposed to an outside wall they have to be treated differently than those exposed to an inside wall – the trick is where you place water lines inside an exterior wall with the insulation
The proper way to insulate exterior walls with water lines is to remove the water lines, frame the wall, insulate, and then put up a vapour barrier. After, add the water lines, and on every stud put a 2” x 2” strapping, then drywall. If you insulate the water lines this way, then the water lines are on the warm side of the vapour barrier.
Don’t trap the water lines behind the vapour barrier on the insulation side. If the water lines are sealed on the cold side of the vapour barrier they will freeze.
How to Thaw Frozen Pipes
If your water lines weren’t installed with the best practices in mind, and you have frozen pipes in your home, here are some tips to thaw them out safely: