How to fix a leaking water pipe in a tight space
Repairing a pipe leak in a confined area like beneath attic ductwork requires choosing an appropriate temporary or semi-permanent fix to avoid high plumbing costs. However, recurring pinholes in older copper lines often lead to a frustrating cycle of repeated patches that eventually force a full-house replumbing.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1calling a plumber immediately
- 2calling a professional plumber
- 3Using spray flex seal and flex tape as a temporary or unconventional fix
- 4Installing push-to-connect fittings like SharkBites
- 5Replacing the entire water line with PEX tubing
- 6Using copper patches with pre-applied solder or compression joints
- 7filming a video of the leak before shutting off the water
- 8asking for help online while property is being damaged
- 9waiting for the ice to melt
- 10shutting off the main water supply to the location
- 11cutting the outdoor spigot pipe and capping it
- 12Using a Fernco coupling after cutting out the lead pipe
- 13Tying directly into the existing cast iron pipe
- 14added a second attachment to the hose bib that has its own shutoff valve
- 15replace the whole spigot
- 16unscrew the packing nut to replace the washers inside
- 17Cutting the pipe and rejoining the U-shape with two new couplers at the same time.
- 18Checking for the missing stiffener or ferrule ring
- 19Ensuring the pipe goes all the way over the shoulder of the fitting
- 20calling the contractor back to fix it again
- 21checking for proper slope and venting
- 22tightening connections or replacing faulty washers
- 23Turning off the main shut-off valve to stop the water flow temporarily
- 24Re-hang the pipe using steel strapping material (plumber's tape) nailed to a floor joist to relieve stress on the threaded connection, and retighten the nut.
- 25Replacing the metal-to-plastic setup with all PVC components using a PVC coupler and union
- 26Using a plastic nipple with a sharkbite female or a PEX female fitting
- 27Putting all the pieces back together
- 28Trying to patch or seal the leak using epoxy
- 29Searching for a used replacement part or faucet
- 30burying the pipe back over and ignoring the issue
- 31getting quotes from contractors
- 32Temporarily cleaning or blowing out the clogged line
- 33Doing nothing and waiting for the next backup
- 34Paying out of pocket after insurance denies coverage
- 35Removing improperly applied Teflon tape from the threads to allow the rubber gasket to make the seal.
- 36Replacing a rubber gasket that may have been ruined by overtightening.
- 37Using teflon tape
- 38Applying pipe thread compound
- 39Using WaterWeld epoxy around the edges
- 40Calling the water company to locate the shutoff switch
- 41Asking the landlord for the shutoff location and permission
- 42Replacing the flanged drain pipe temporarily with a longer one
- 43Adjusting the p-trap angle and adding a high loop to the dishwasher hose
- 44Using a poly compression coupler
- 45Installing a better quality barbed fitting with extra pipe to gain slack
- 46Applying multiple layers of teflon tape
- 47Using thread sealants like RectorSeal T Plus 2
- 48Retrying the entire setup multiple times
- 49Hiring a professional plumber
- 50Tearing out the drywall to access the fitting
- 51Attempting to seal the leak from the outside with thread sealant or adhesives
- 52Testing household fixtures like the faucet, shower, and toilet to see if the leak increases.
- 53reapplying thread tape
- 54using joint compound on metal-to-metal surfaces
- 55using pipe dope
- 56tightening connections further with wrenches
- 57Using a shielded Fernco clamp on a cleaned surface after cutting out the cracked section
- 58Applying plumbers putty and wrapping with duct tape or Gorilla tape as a temporary band-aid
- 59Saving money for a future DWV repipe or partial replacement
- 60Cover it back up and leave it
- 61Clean the pipe and solder over the damaged spot for extra support
- 62Cut out the damaged section and install couplings and new pipe
- 63Reheating the joint to reflow solder and add more flux, or testing the system with air pressure.
- 64Turning off the water supply valve to stop the leak temporarily
- 65Replacing the old supply line with a braided stainless steel one
- 66Watching YouTube tutorial videos to learn how to replace the toilet supply line
- 67Using Flex Seal Power Putty
- 68Getting a sharkbite fitting
- 69Using a repair clamp
- 70Adding pipe dope alongside thread seal tape
- 71Tightening the fittings further using additional leverage or larger wrenches
- 72leaving the nicked pipe alone if it has not leaked
- 73buying tools and materials online to fix it yourself following a video tutorial
- 74Checking if the pressure increases when the boiler runs
- 75Replacing the expansion tank
- 76Replacing the pressure relief valve
- 77Using JB WaterWeld or epoxy putty as a temporary patch
- 78Cutting out and replacing the leaking solder joint
- 79Waiting to see if it resolves itself as it acclimates to water pressure
- 80digging around it a bit more to see where it goes before doing anything else
- 81calling the call before you dig number in the area to mark out buried lines
- 82Screwing the spigot in tighter
- 83Unthreading the faucet, applying Teflon tape and pipe sealant to the threads, and reinstalling
- 84Resoldering the connection if the leak is at the solder joint
- 85Putting a bowl under the leak and waiting
- 86removing the deck board to clear out old foam and caulking
- 87Applying tar and kick-out flashing to divert water
- 88Planning to have a plumber replace and relocate or repipe the vent
- 89Wrap the crack in a few layers of rubber tape and secure with a hose clamp
- 90Cut off the raised section of the elbow and connect pieces with a rubber slip coupler
- 91Using a hub saver tool with carbide cutters to drill out the old pipe from the fitting and installing a new piece of PVC pipe
- 92Cutting back to 3/4-inch and sweating on new brass female adapters
- 93Replacing the entire water heater tank
- 94Backing off the threads on the compression nuts to tighten the fitting going into the tank
- 95Cut the pipe before the bend or elbow and cap it there.
- 96Dig out around the pipe to create working room, cut it with a small hand saw or nylon string, and use PVC primer and glue with a new cap.
- 97Repairing the busted pipes individually after they fail.
- 98Pre-fabricating a copper 90 fitting and fishing it up through the floorboards
- 99Accessing the underside of the pipe from the basement room
- 100trying to put a ton of teflon tape on the tailpiece
- 101asking if theyd rather it put together properly and just do an under sink repipe
- 102loosening both nuts, sliding the grey pipe down and removing it
- 103adding some packing string or a thick rubber gasket
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“The internal shut-off valve (quarter-turn shut-off handle) to the outdoor spigots was closed all winter but clearly there was still a leak.”source ↗
“Is this something that I need to call right away for or should I wait for the ice to melt?”source ↗
“Water line in the attic has a leak. What’s the best way to fix it? It’s right under the ductwork. Kinda in an uncomfortable stop to work in.”source ↗
“The house I grew up in started getting pinholes in the copper lines a few years ago. A new one would pop up every couple of months, then every month, then every few weeks.”source ↗
“We turned off the water WHILE wife was taking the video. Y’all can stop laughing now.”source ↗
“Hi, I cracked into a white PVC pipe about an inch in diameter. It didn’t immediately spew anything out like water or anything.”source ↗
“Edit: it’s our irrigation pipe for the yard. How do I go about fixing this? Is there any possible effect on any of the other water lines in our home?”source ↗
“I had the same situation in my house. After the 4th or 5th time, we just had the whole house replumbed.”source ↗
“Twice now the line connected to the cold water pipe has popped off when turning on the regular faucet.”source ↗
“I truly don't know what I did incorrectly.”source ↗
“my issue is sewer flies in the backyard and house insurance says bellies are normal and wont cover it. it clogs maybe every 2 years or so. repair the belly 20 ft or so? replace the whole line? do nothing?”source ↗
“I have cutting out chip board to replace and I have slightly damaged the pipe, and want to ask for advice if this lasts or need to be redone ?”source ↗
“Getting leaks at the threads after 4 wraps and very tight I don't wanna strip anythig.”source ↗
“Roof replaced 3 years ago. 1 month after replacement this circled area started leaking”source ↗
“Now, 3 years later, same leak, same place.”source ↗
“They have a labor warranty and said they'll come take a look at it but said there's not much they can do except re-tar and "it's just one of those things youre going to have to maintain every few years".”source ↗
“Never had any issues with the boiler but I just noticed the leaking a couple days ago. PSI is normal. All the valves are in the right positions. What could be causing this? Please help!”source ↗
“The vanity plumbing is leaking where the black PVC meets the white PVC. He has already come once to “fix it.” It’s still leaking.”source ↗
“I was pulling weeds in my front yard yesterday when I notice this leak out of the water pipe that is where our water comes in from the city.”source ↗
“Is this something fixable on my own? Or will I need to call a plumber?”source ↗
“Now, years later, the caulking breaks, and water seeps down and stays in the foam between the flashing and the deck board.”source ↗
“They just shoved a PVC pipe into a lead pipe with a rubber liner and caulked around it the caulking failed and now it's leaking again looking for ideas on how to fix it”source ↗
“Tenant left the home and said there was a small leak. Not sure if this is something I can fix myself or call handyman/plumber. What is the thing inserted inside the faucet?”source ↗
“Our sprinker system broke at this connection. It was just a coupler between the main pipe and the valve.”source ↗
“I can't get enough space between the valve and the main pipe to screw in a coupler as well as fitting the coupler over the pipe.”source ↗
“Here’s the kicker: it’s tucked away in a spot where I physically can’t get a standard wrench or tool onto it without tearing out the wall.”source ↗
“It's soo tight right now, not gorilla, but tighter than expected.”source ↗
“Hello new homeowner and looking for advice. I have a leaky solder joint on a copper drain pipe (not pressurized) and was wondering if jb water weld would be able to stop the leak or what the best options is. Is it worth getting a plumber out to fix it or can I try jb water weld first?”source ↗
“The tub faucets leaks. And if I pull up the diverter(which is attached to the top of faucet) so that the water goes to the shower head, then the showerhead starts leaking.”source ↗
“I live in an apartment, and I already asked the landlord to let me know where the shutoff switch is, and I can fix it.”source ↗
“He doesn’t even know and expects me to call the water company in order to figure out where the shut off switch is.”source ↗
“Just wondering if the problem is an old and used diverter that is worn out.”source ↗
“I know I can fix it myself, just want to make sure it’s ok to take off the tub faucet as long as I don’t try to take off what’s behind the wall.”source ↗
“My yard sprinkler system developed a leak. I dug it up to find what looks like a really poor prior repair.”source ↗
“I'm trying to decide what the best repair would be.”source ↗
“Sump pump pvc that shoots water to the outside has cracked. Right now my city is being bombarded with non stop rain so don't feel confident pulling out pvc from the house and making things worse.”source ↗
“What would be a temporary solution to get me through the coming days?”source ↗
“Ideally Id like to replace the elbow but it leads directly to the house with not much play room underneath, how should I tackle this once the stroms stop?”source ↗
“I broke an underground line. I dont need it. Im going to cap it. But its now broken. And the piece is to small to hold the cap on.”source ↗
“I foolishly removed the wire to get a better look at the situation, and now the pipe is leaking when I check the tap.”source ↗
“The white transition fitting has been replaced 3 times, already. It will be will be good for a month or two and then have a small crack with a leak.”source ↗
“I took the p trap out to see where the leak was but I don’t know how to stop water coming out from the black pipe”source ↗
“I took the p trap out to see where the water was coming from”source ↗
“I know the general consensus is to replace this, but I'm kinda pissed off because it's a year old Kohler Triton kitchen faucet (model 7825-K-CP) and I already can't find a replacement spout. Any idea what would be the best way to patch this? Some kind of epoxy?”source ↗
“Update - they said the part is discontinued, and they won't replace it because the seller I purchased it from wasn't an authorized seller even though it was new in box at the time.”source ↗
“Now I'm just wondering if if should be a spot repair. Or if I should shove the dirt back on top and call it a day.”source ↗
“Not sure what the heck this metal pipe is.”source ↗
“Got a new faucet and water install as soon as I turn in the line it leaks from ours bolt. Does this mean the connection is not fixable?”source ↗
“Took off teflon and still leaking”source ↗
“I just can seem to get a good seal on the threads, I keep having leaks, it’s a male pvc to female metal threads, I’ve used teflon tape, I’ve put compound on it as well, and finally I’ve tried waterweld as a my last resort around the edges and it didn’t work.”source ↗
“Not a plumber but the top piece is not connected and was being held up by the garbage disposal.”source ↗
“I was planning on at least replacing the flanged drain pipe with a longer one temporarily as we're getting ready for a kitchen remodel anyway”source ↗
“This was my FOURTH try at doing this myself.”source ↗
“All of the joints I have installed are holding up fine, only leaks I'm having are at the threads of the valve body.”source ↗
“I'm just about out of ideas on what to do next.”source ↗
“Found a small leak on my main line out to septic. Looks like the top section was already repaired in the past. All other sections I can see look fine.”source ↗
“We recently purchased the house and already spent on repairs. Not sure what I am going to do.”source ↗
“That is the one area that my husband is having trouble with. It is leaking slightly and he needs to fix it before proceeding.”source ↗
“When I turn off the water, of course nothing leaks but after I turned the water on and flush it it starts leaking. Is this a simple fix or something a professional will have to do?”source ↗
“I don't know much about a toilet and also my Nan's sink is low on the cold water but that's a separate issue lol. Can you link me to the parts I need and is it an easy job a non-plumber can do?”source ↗
“Can I use Flex Seal: Power Puddy as temporary fix till i replace this old Poly-B pipe?”source ↗
“Uuhhg, was trying avoid a trip to the store today lol. Oh well”source ↗
“I believe this is a water line to the outside faucet. It has been 6 hours and has not leaked. Thoughts on what to do?”source ↗
“There doesn’t seem to be any movement. I also don’t have any tools so I would need to call a plumber”source ↗
“The hole is only an inch and a half so it would need to be opened up more. I would need to call a plumber either way as I don’t have the tools or experience.”source ↗
“Now that it’s back on we’re seeing water is leaking slowly from a section or two in the water valve outside of my house.”source ↗
“I recently discovered that it is leaking by the threads of the spigot.”source ↗
“The spigot did not seem screwed in all the way, so I screwed it in a little tighter which has helped with the the leaking it appears but now my spigot is sitting crooked outside.”source ↗
“So the red pipe bottom row second from the end (has the yellow/blue thing around it) is dripping very slowly. Maybe 1 drop a minute.”source ↗
“No idea what’s going on here, I used to think I understood plumbing. What is this and how would someone go about fixing it?”source ↗
“This entire setup is an unknown to me so I don’t want to just go turning stuff.”source ↗
“Or would it be better to just put a bowl under it and wait?”source ↗
“How do I fix this without having to mess with the main line?”source ↗
“Just discovered that my water heater is leaking from this fitting... how do I approach fixing this?”source ↗
“Just looking to avoid having to sweat on a new fitting in if I can, hoping I can just tighten something up”source ↗
“Hot water heater got replaced by plumber today as soon as the water supply to the house got turned back on a pipe in the wall busted.”source ↗
“When the water supply got turned on again for the second time another pipe in the wall busted.”source ↗
“I am so worried it’s going to happen again at a time we aren’t here to quickly react to it.”source ↗
“Is this leak possible to fix without cutting open the exterior wall of the house”source ↗
“There is a pinhole leak right underneath the floorboards in the pipe for this radiator.”source ↗
“A plumber told me to fix this we would need to cut open a hole in an exterior wall so he could have access to the pipe. Is this true?”source ↗
“Directly under this sink is some gray plastic pipe that is joined to the rest of the black pipes with this plastic screw on nut(?) This is where it leaks.”source ↗
“The nut (?) unscrews easily but I can't lift it up the gray pipe. It feels like it skips on the last thread.”source ↗
“*** the leak is front the top of the nut (?) Not coming from the threads.”source ↗
“I'm still getting a leak from every joint essentially”source ↗