Steps to de-winterize a building:
This article explains how to de-winterize a building, including turning the water supply back on and getting heat, plumbing fixtures and other systems working.
We also discuss what problems to look for when de-winterizing a building. The articles at this website will answer most questions about freeze protection for piping and other building plumbing and heating system components: how to winterize a building to avoid frozen pipes, and how to thaw frozen water supply & drain piping, wells, & water tanks.
InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.
- Daniel Friedman, Publisher/Editor/Author - See WHO ARE WE?
"Frozen pipes" does not mean that the entire length of plumbing or heating lines has become frozen. More often pipes freeze at one or more "cold spots" such as those we've discussed above.
Our photo shows building piping running through a poorly insulated area behind a shower. The combination of lack of building insulation, lack of pipe insulation, and the inability of building heat to enter this chase-way resulted in a frozen water pipe where we're shining our flashlight.
[Click to enarge any image]
The steps below discuss how to find just where piping has frozen and how then to thaw it out safely.
We've used simple touch, by hand, feeling pipes for changed in the pipe temperature, or infra-red scanners to scan along piping to look for a drop in pipe temperature that may mark a frozen pipe location. If the heating pipes are frozen, often a section of the heating baseboard will be hot (hot water rising into the piping by convection if not forced by the circulator pump).
Some methods we've seen used to thaw frozen pipes, in our preferred order include:
Although we may have been careful to follow all of the best practices in winterizing a building, it is still possible that a pipe has frozen and burst during cold weather.
If a hot water heating pipe has frozen or a steam condensate heating pipe has frozen you won't see the leak until the building warms up but you may have trouble getting heat in some areas.
If a water supply pipe has frozen you will see the leak as soon as the building warms up and the frozen pipe thaws, unless water has been turned off.
If a drain pipe has frozen you'll notice it as the drain will be blocked. Worse will be the discovery of unsanitary water leaking when the piping thaws. Here are some tips for making repairs when these problems occur. A frozen fixture trap will be a smaller local leak that you should discover quickly by inspecting each fixture.
The exception which occurs commonly is a frozen bath shower trap in a bathroom over an unheated garage. Such traps or other plumbing leaks may drain into the garage ceiling where they cause more damage and take a bit longer to discover.
Find & repair the any frozen, leaky pipe breaks, cut out and replace that section of piping as described
Although we may have been careful to follow all of the best practices in winterizing a building, it is still possible that a pipe has frozen and burst during cold weather.
So the procedure of turning heat and water supply back on in a building needs to include some careful and frequent checks for leaks or unsafe (heating system) conditions.
Never ever simply turn on water, heat, or even electricity in a building that has been shut-down without remaining to monitor for unsafe conditions, fire, smoke, improper heating system operation, or the presence of leaks.
We prefer to get heat working again in the building if it has been shut down, before starting other plumbing work.
But look at the heating equipment before even thinking of turning it back on. If your furnace has been flooded as this one, it is possible that the system is unsafe and should not be turned back on.
Watch out: Before turning a heating system back on we need to:
If the heating system was a steam or hot water boiler, check the boiler carefully for leaks when it is restored to service.
Particularly some models of cast iron heating boilers may include boiler sections which loosen when the boiler spends months in a "cold" state, leading to boiler section leaks when the heater is filled and returned to service.
Remember to replace any plumbing traps that were removed from sinks, tubs, showers, etc. before trying out a fixture by turning on its faucets.
Then when you are ready to turn on the water supply, remember to run enough water into each fixture to fill the trap, then check the trap for leaks.
If your traps corroded, or if the trap arrangement is improper like this crazy collection of double-S-traps under a sink (photo at left), this is a good time to toss the old parts and have a plumber install a new trap that drains properly.
After you have turned on water supply, try each fixture by running a gallon or less of water into it. Then turn off the water and check the fixture trap for leaks.
When you're confident that you've restored the fixture trap without leaks, run water longer to test the building drain piping for blockage or leaks.
Stop, look, and listen for leaks.Before leaving the building that has been de-winterized, turn on one or more fixtures at a time, leave water running for a few minutes while you walk through the building looking and listening for evidence of a drain leak.
Watch out: Check for drain leaks both indoors and outside before leaving the building. Of course if you detect a leak in the drain system turn the water supply off immediately and remove any spills before starting the leak repair.
Here we recommend that you follow a staged step by step approach to turning on water in a building where the water supply has been shut down over a winter or during a period of absence.
The staged approach lets us check each building area and fixture one by one, minimizing the chances of extensive water damage even if a leak has occurred while the building was unattended.
Even for buildings located in areas not subject to freezing and burst pipes, a staged water turn-on approach is useful. A pipe may have been damaged or cut by building activities, a trap may have corroded through, or other plumbing damage may be present even if no freezing conditions occurred.
Step by Step Details of the staged water-on procedure can be read
at TURNING ON WATER when you are "de-winterizing" a building or returning it to service.
...
Below you will find questions and answers previously posted on this page at its page bottom reader comment box.
On 2017-05-05 - by (mod) -
Katy
Often I see this red water after it's sat for months in galvanized iron pipes - where rust is in the water; typically it'll flush out in minutes of running. But if rusty water entered your water heater tank too then you might need to turn off, drain, then re-fill the heater after you've also flushed the pipes.
Certain bacterial contamination can also cause red stains in water, as can iron in the well water supply source. So if your pipes are all copper, I'd start with a water test.
On 2017-05-05 by Katy
After the water has been turned on after the winter, the water runs brownish red. How long do I run the water? Any advice please.
Katy
On 2016-12-15 by diane
Also, The city could not turn water off at the street due to a stone in the shutoff location. Given water main is off at house should I insist on the city turning the water off at the main too? Will it not being turned off at the street increase the liklihood of the line between the house and the street freezing?
On 2016-12-15 by diane
My thermostat battery died on a vacant home resulting in losing heat in the home during several cold days/ several radiators burst and are frozen. I have turned off the water main to the building, opened all faucets within the house and opened the drain to the boiler and have allowed the system to drain.
I have installed several space heaters to the home to restore some heat....keeping it approximately at 45.
Do I need to thaw the radiators that have frozen to protect any other damage to ones that have not been damaged?
Also what steps do I need to do to the plumbing for bathrooms etc if I elect to simply winterize the building completely and do plumbing and hvac repairs in Spring?
On 2016-12-01 by Kim
Hi; first- time homeowner here. We have restored water service from our winterized house; the water runs properly with no leaks but it doesn't get hot.
Above each w/h, there is a loose wire--I'm thinking that's the grounding wire? If so, do I need to connect it--and what do I connect it to? Thanks in advance!
On 2016-06-04 - by (mod) -
A shutoff valve or multiple valves may still be off.
On 2016-06-04 by Dell
No water flow in house after water service turned on. Bought house and house was winterized. Water flow only in hit water tank not in faucets. What is wrong?
1/27/2014 Bill Schultz said:
Have had extreme cold weather here.
Last week we woke up one morning and had no water pressure.
Have submersible pump in 4" well casing.
After some heat application I noted a small increase in tank pressure - approx 10 lb.
Would not increase past that. I have been using panel switch to turn pump off and on
and I get a flow of close to pencil width. About 10 minutes to fill small pail.
Submersible has been in well for 30 years or so.
Can I check anything to get pressure or should I consider replacing pump?
Water line to house is close to surface and has a heat cable attached. It certainly
is a pain in this cold weather.
Leave some faucets open in hope that you will relieve increasing water pressure in water supply piping that may be freezing. There is a chance that that will reduce the chance of burst pipes. Of course if water begins to flow at normal rate you'll shut it off.
Often if water supply piping anywhere in the system is PARTLY blocked by freezing but you can get water flowing, by leaving water running you'll thaw out the frozen line. So I'd try that too.
But I would NOT leave a well pump running if no water is being delivered as I'm worried about damaging the pump.
Check that your heating cable is live and working.
Beyond that, you can try using a normal hair dryer to blow warm air on the coldest pipe sections indoors. More suggestions for thawing out frozen water pipes while trying to avoid setting the house afire are
at THAW OUT FROZEN PIPES.
Search InspectApedia for the article PIPE FREEZE-UP POINTS for a series of articles on finding where pipes are most-likely to be freezing and how to deal with the problem.
This topic has been moved to and expanded at LEAKY PIPE REPAIRS where we describe methods for shutting off building water when the water main shutoff valvce is inoperative or missing.
...
Continue reading at AIRBOUND HEAT SYSTEM REPAIR by WATER FEED VALVE or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.
Or see these
DE-WINTERIZE a BUILDING at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.
Or see this
Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia
Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.
Search the InspectApedia website
Note: appearance of your Comment below may be delayed: if your comment contains an image, photograph, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. Apologies for the delay.
Only one image can be added per comment but you can post as many comments, and therefore images, as you like.
You will not receive a notification when a response to your question has been posted.
Please bookmark this page to make it easy for you to check back for our response.
Our Comment Box is provided by Countable Web Productions countable.ca
In addition to any citations in the article above, a full list is available on request.