Tuesday 15 December 2020

Frozen Pipe Prevention and Repair

Posted by at 6:47 AM

When winter weather blows into town, frozen plumbing poses a serious risk to your home.  The pressure exerted by frozen water in a pipe is enough to rupture the pipe, creating a water damage time bomb.  Because the water inside the pipe is frozen, you won’t know about the rupture until it unfreezes and begins spewing water all over your home.  Knowing how to prevent frozen pipes, recognize them if they happen, and take care of them when they do could be the difference between a standard winter in your home or tens of thousands of dollars of water damage. 


Pipes in certain areas of the home are more susceptible to freezing than others.  When trying to prevent frozen pipes, pay special attention to:

  • Plumbing in exterior walls
  • Cabinets under sinks, particular if they’re also on an exterior wall
  • Unheated and unfinished crawl spaces and basements
  • Outdoor faucets

Truly, the best way to avoid damage from frozen pipes is preventing them from freezing in the first place.  There are several easy steps that can be taken to help with this.

  1. Leave faucets dripping very slightly during the coldest time of the day and at night, particularly if you’re going to be outside of the home and your heat will be turned lower than normal.  This will keep water flowing steadily through the pipes which helps prevent freezing.  Yes, it will increase your water bill slightly, but a minimal increase in your bill is better than the thousands of dollars in damage that can result from a frozen pipe. 
  2. For pipes that are located under the kitchen sink or in a bathroom vanity, crack open the cabinet doors so the warm household air can flow from the room into the cabinet and keep the pipe warm.  This is particularly important for those pipes that are on exterior walls.
  3. If you know that you have a susceptible pipe like those located in garages or crawlspaces there are a couple things you can do.  First, wrap the pipe with electrical heat tape and run it when the weather is particularly cold.  Second, you can insulate pipes with foam insulation.  It’s important to note that insulating the pipe will not actually prevent the pipe from freezing if the air around it gets cold enough, it will just slow the process down. 
  4. If you have an area of the home that is unfinished and unheated, look into a permanent heater for the area that will keep the temperature above freezing.  DO NOT RUN A PORTABLE HEATER UNSUPERVISED.  Invest in a heater that is intended to be permanent. 
  5. Before the weather turns, remove all garden hoses that are attached to outdoor spigots and turn off the water to the faucet if it is not a frost-proof faucet.  This will drain the exterior section of the pipe so there’s no water left to freeze. 


Beyond a burst pipe indicating that it’s too late, it can be difficult to locate a frozen pipe.  The tell-tale signs of a frozen or freezing pipe are extremely cold water coming from the faucet that doesn’t warm up or little to no water coming from the faucet when you open the tap.  These are indications that there is an ice blockage somewhere along the line.  You’ll want to immediately shut off the water to that line either at the source or at the home’s main shutoff valve, then open the tap.  Follow the pipe backwards from the faucet until you find the area of the blockage which will be indicated by the pipe running through an exceptionally cold area, a frosted or iced over pipe, or a pipe that has a bulge or fissure. 


If you’ve discovered a frozen pipe that has not yet ruptured, it needs to be thawed immediately.  How you thaw the pipe will largely depend on where it’s located.

Hidden Pipes

There are a few options for thawing a frozen pipe that is hidden inside of a wall or in the ceiling.  Because of the location of the pipe it can be difficult to diagnose that it’s frozen and to access it to unfreeze it. 

  1. The first and least invasive solution is to turn up the heat in the house, wait, and pray.  If you’re lucky, the increased heat will be enough to thaw the pipe and get the water flowing again.  If you believe the frozen pipe is inside the wall behind the bathroom or kitchen sink, make sure to open the cabinet doors so heat can flow through to the wall. 
  2. If you’re fairly certain of the location of the freeze within the wall, use an infrared heat lamp to heat that section of the wall.  The infrared heat will pass through the wall without causing the materials within the wall to overheat and become damaged. 
  3. The most invasive way to thaw a frozen pipe that’s hidden within the wall is to unhide it.  Remove the section of the wall or ceiling where the pipe is located and then thaw it the same way you would thaw an exposed pipe. 

Exposed Pipes

Exposed pipes are more susceptible to freezing because they’re often in unfinished areas of a home, but they’re also easier to thaw than hidden pipes.  There are multiple way the pipe can be thawed, but regardless of which one you use, you’ll want to heat the pipe moving from the faucet towards the frozen area to allow water to flow out of the faucet as it melts. 

  1. Hair Dryer

Hair dryers are both the safest and easiest way to thaw a pipe.Simply blow the hair dryer along the frozen area of the pipe until water is flowing freely out of the tap.A trick to making this quicker and more effective if the pipe is very close to the wall is to put a cookie sheet behind the pipe will you heat it.This will radiate heat off the cookie sheet and back onto the backside of the pipe.

  1. Heat Lamp

Infrared or incandescent heat lamps work well for this.Again, slowly heat the pipe until water starts flowing freely from the faucet.The cookie sheet trick can be used for this as well!

  1. Portable Heater

Portable heaters are great solutions for warming pipes that are underneath a kitchen sink or vanity cabinet.  Direct the heater at the frozen section of pipe.  It will warm the entire cabinet area and very quickly remove the ice blockage.  It’s been said already, but it bears repeating: DO NOT LEAVE A PORTABLE HEATER UNATTENDED!