Fixing a Leak Under a Concrete Floor The Easy Way | Emergency Plumbing Guide

This emergency plumbing guide will show you how to fix a pipe leak under a concrete floor the easy way! If you've got a leak under a concrete floor, then this guide is for you! With easy step-by-step instructions, this guide will show you how to fix a leak under a floor in no time using slip couplers. You'll learn how to fix it and how to prevent future leaks.
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[@TheDIYGuy1]

Hope you guys enjoy watching me tackle this awkward little job! Oh and it wasn't me that dug the floor up otherwise I would have given myself a bit more room to work 🤪

[@warptoad5168]

Thanks for the video, I think I've got an underfloor leak myself. But you can obtain a pipe cutter that could possibly cut most if not all of the copper pipe, without using a junior hacksaw for all of the job. Air conditioning guys use them a lot in the smaller sizes available

[@davidhiggins4997]

@@warptoad5168 Have you got a multi cutter available? I had some joy using mine in tight spots, admittedly on wood but with a metal cutting blade I'd have got on the pipes in the video.

[@Darth_Chicken]

I have a vibrating cutter which is fantastic for jobs like this.

[@davidbridge3542]

Well done, good video. I've just retired from being a plumber and a college lecturer in plumbing and this was well delivered.

[@TheDIYGuy1]

Awesome, thank you!

[@bobbojones8157]

Very methodical and loads of care at each stage , I’m a retired plumber and appreciate how difficult that job is .

[@TheDIYGuy1]

Thanks very much. Hopefully it helps people.

[@geotj58]

YOUR A RETIRED PLUMBER !!!!!!!! YOU HAVING A LAUGH, JESUS WERE HAVE YOU BEEN HIDDING, RITIRED FROM WHAT?????? RETIRED PLUMB BOB

[@sevenodonata]

My Dad was a plumber for 50+ years and he always said the easiest way to fix a leak under a concrete floor is to call another plumber! 😂

[@TheDIYGuy1]

😂 brilliant

[@phoenix_268]

Even when he is a plumber himself ?

[@neiltitmus9744]

Yes hes not wrong there lol

[@neiltitmus9744]

Easiest way to fix any plumbing problem get someone else to do it,thats what my boss does

[@jamesdevlin1282]

🤣🤣🤣🤣

[@YeahNoTellTheTruth]

I guess half the people watching don't realize how tricky this repair is. Well done.

[@apb3251]

Great job. One comment, if you cut the pipe and resolder a new joint my recommendation would be to stagger the cuts (as there are two pipes) this means if the soldering needs to be done again it will be easier to access. Also means you do not risk reheating the first solder when doing the second pipe.

[@eggmanfryer]

And I would start with cutting that big dent out of the 1st pipe because that dent is going to be his next leak in a few months or years.

[@LabRat6619]

The lowest part of the house is definitely the wettest, it could take days to dry out enough to solder. Also do all your polishing before cutting, its easier to prep.

[@jackb1803]

Brilliant, of course!

[@bobbo9549]

Well explained video for the novice. A tip I was taught by an old plumber was after draining down drill a small hole in the section of the pipe you’ll be cutting out after undoing a large jubilee clip and refitting it on the pipe you’ve drilled. If you have drained the wrong pipe and it’s still full of water you can get a pencil rubber and clamp it over the hole with the jubilee clip to stop the water flooding the place until get to drain the right pipe. Sounds like a bodge but will save you flooding place.

[@tonygoshive785]

Amazing content as always, love the way you explain things and love your presentations. Such an underrated channel. Hope you reach 1m sub milestone soon! :)

[@TheDIYGuy1]

Thanks very much! I hope so too 😀

[@Idaho_Mas]

Great video mate would have been cool to see how you located the leak and drilled out access

[@pettofficial.]

I've got some adhesive tiles coming away from my concrete floor, and it's wet underneath, I think this is going to be my next job so glad I found this vid, great stuff! After having my gravity fed system replaced with a combi, I'm finding a few joints weeping, is this normal because the added pressure from combi or bad soldering in the first place? I think once I mend this, another one will make itself known, this could turn into an endless job! 😒

[@robwilton8001]

That dented section definitely needs replacing otherwise it will wear internally and create a pinhole.

[@TheDIYGuy1]

I would have loved to change that but unfortunately I was asked to replace the section that I replaced and no more due to the home owner wanting to save floor tiles.

[@tannerwest6823]

What about using a mini hacksaw

[@LabRat6619]

Could have used a copper "patch saddle." They come in 15mm and 22mm, both with integral solder. Brilliant invention.

[@doragizdench8433]

@@TheDIYGuy1 save floor tiles that's funny 🤣 so when it next leaks and needs digging up you will be coming out under warranty in 6mth saying you didn't fix it properly

[@gregm2557]

Could easily have been cut 2 inch further back without having to take any more tiles up

[@BayLuke96]

Cutting copper pipes in situations like that is far easier with a sonic/oscillating multi-tool and involves minimal stress to the surrounding pipework. Didn't know about those slip couplings - very handy.

[@Hambini]

You make that look easy! I wish I'd seen the digging to get to the pipe! Good job

[@TheDIYGuy1]

Thanks a lot. I didn't do the digging, I just got the job of repairing the leaks 🙂

[@brrymcgolly]

Since signing up to your videos I've learnt so much my plumber actually said last week who's been changing all the valves on the radiator. It's just having bit of confidence. Thanks for your videos

[@TheDIYGuy1]

That's great to hear. Thanks 👍

[@geotj58]

EVER TRYIED GETTING A PROPER COURSE RATHER THAN BELIEVING THIS SHIT

[@oldskoolclassic]

Nice to see someone still soldering, instead of press sh#t ,,, hope inhibitor was added to protect boiler and rads

[@TheDIYGuy1]

Yep thanks

[@plumberparts]

Flippin hate this job. Good effort mate!

[@TheDIYGuy1]

Most people do, including me 😂. Thanks mate!

[@TheMark1840]

you should be proud of yourself - you explain things well without a load of waffle and ego.

[@TheDIYGuy1]

Thank's very much. I'm glad you like the videos

[@richardlewis5316]

Tight joints are are nightmare I agree! To cut pipes in this situation I use a multi tool which cuts copper easily. I'm also a wire wool user but I notice that you didn't clean the fittings. If they have been in the box for some time they do need a clean. Also with Yorkshire I put a dab of solder on the joint as belt and braces!!

[@darrenmackenzie1892]

Great video & workmanship!

[@TheDIYGuy1]

Thanks 👍

[@RezNewby]

Fancy leaving a length of pipe under the floor with a great crease in it - weakened & susceptible - other than that a great example of fixing - good & informative.

[@TheDIYGuy1]

That wasn't up to me I'm afraid. I can only do what the homeowner wants done.

[@richard_in_rayleigh]

Missed this video 10 months ago, just watched. The crease was so close to your cut, could you not have just cut back a bit further to include the crease? x

[@pauleastham2177]

Wish I'd seen this a few years ago. Had to do this in a kitchen extension on the mains supply. Perfect storm: Just after the merchants had shut, couldn't find stop cock in the house, had to use the one in the street, home made end feed slip joints by hammer expanding 15mm pipe, could not get water out of the pipe and 1 part refused to solder. Maybe I should have tried the bread trick. Near breakdown after 6 hours at 3am, I gave in and used a Hep2O, which I really didn't want to use under concrete. I guess it will fail in about 30 years, so I moved house.

[@TheDIYGuy1]

Thanks for sharing

[@alexp893]

Good video. Nice to see a real-world awkward location being worked on.

[@TheDIYGuy1]

Glad you enjoyed it! Thanks

[@Harley-ir4er]

Enjoyed the guidance but as these pipes were under concrete I would be interested to know how you found the leak under the concrete. Often a leak can show up many meters away from the location of the burst pipe.

[@plummetplum]

I'm not a pro plumber but done some DIY and that's one of those nasty jobs for sure. I knew about Yorshire fittings but the slip coupler was a great tip, nice job 👍

[@TheDIYGuy1]

👍

[@LearnPlumbing]

Multi-Tool with Metal Cutting Blade is what I would cut that copper pipe with. Thank You for the great video

[@TheDIYGuy1]

Yep, I would do in most circumstances too. Only reason I didn’t in this video was because I wasn’t sure if many people would have a multi tool whereas most have a hacksaw

[@tigeros241]

good job i just wonder why you didnt replace more of 1 pipe you can see damage i would do that but is only my point of view :)

[@helinghaus]

briliant guide and descriptive tutorial, the OCD in me though thinks you should have cut and extra couple of inches down to fix that kink in the pipe too.

[@TheDIYGuy1]

Me too, unfortunately the person who's house that was didn't want to knock back any more concrete

[@tomalex4806]

I had a massive problem yesterday as i was drilling pilot holes in the floor for a carpet trim didn't even go that deep and hit a water pipe. The water and gas pipe are right next to eachother and i found out the hard way that they are so close to the surface of the floor and not buried deeper. Builders cutting corners... Emergency plumber came out and he drilled through the gas pipe 😮

[@markellwood4132]

These skills should be taught at school. Give the children a fighting chance earning an honest living. Good on you passing on skills people need.

[@TheDIYGuy1]

Absolutely right 👍

[@rodgerq]

Nice video! A nightmare of a job no doubt. A multitool with a very narrow metal blade can be handy for getting in to cut awkward spaces, just takes a bit more deburring.

[@TheDIYGuy1]

Thanks. Absolutely, typically I left mine at home and arrived at the job and had to tackle it is he hard way 😀

[@rodgerq]

@@TheDIYGuy1 good character building doing it the old fashioned way 😬

[@peterwickett9088]

Done a good job 👏

[@TheDIYGuy1]

Thanks

[@diddywright6165]

Good content as per mate, would have loved to see the hovis come out though! Nothing worse than water in the pipes when you’re soldering😭

[@TheDIYGuy1]

Absolutely! Thanks very much

[@ilricettario]

Just saying you can use a Dremel with an extension cable works perfectly and very accurate.

[@TheDIYGuy1]

👍

[@etch667]

Worth mentioning is to cover the pipes with some protection before the floor is put back, easy to forget.

[@TheDIYGuy1]

Absolutely, denso is best

[@hansjansen317]

Not being a pro, I would manage to fix such a leak. But I would like to find out why the leakage ever occurred. Is the copper corroded by concrete? Is wet conditions on the exterior of the piping the source of the problem? Not cleaning properly after soldering? Cavitation because the pipes were not deburred? And most important, how do I prevent problems in the future??

[@pcno2832]

If you search for "corro", you'll find a bunch of explanations. It seems that they do make coatings and membranes to protect the copper.

[@zerajera]

You could use a vibrating multi-tool to cut the copper pipes. Thanks for sharing.

[@TheDIYGuy1]

Yep could do 👍 , I didn't include that as a lot of DIYers won't have one.

[@zerajera426]

@@TheDIYGuy1 Fully understand that. Cheers

[@k20aa]

Cant believe you didn't cut that other section with the dent in

[@TheDIYGuy1]

The home owners job was to dig out around the pipe and unfortunately they hit the pipe. On arrival I unfortunately had to work with what I had in limited time.

[@JP_TaVeryMuch]

@@TheDIYGuy1 It's a golden rule that it's always better to do the whole job yourself. Shouldn't be, but somehow is. Many's the time when a helpful client has inadvertently made the job more difficult, twice as long and therefore more expensive. Any tips from your experience on how to tell them just to "LEAVE IT!" because I still haven't found the perfect wording‽

[@craigwatson7692]

@JPTaVeryMuch simple, just say you do all of it or you do none if it.

[@twiztwiz9717]

What kind of tradesman should I be looking for would to fill in the trench after copper pipe repairs?

[@michaelp998]

The reaction between copper pipe and concrete is asking for trouble. The high alkaline environment, + the movement of copper when heated against a non movable surround is also asking for trouble. Great fix there bud!

[@TheDIYGuy1]

Absolutely! Thanks a lot

[@davidjones5575]

Great video, find it very helpful 👍

[@TheDIYGuy1]

Glad it was helpful!

[@d.w.390EzraHawkwind]

I'm going to have to get my plumber back to sort this very issue. I had a new boiler installed just under a year ago and had some new piping put under the concrete floor in the toilet. A few days ago, I noticed water coming up through the concrete. He's away on holiday until Sunday, so I'm having to keep turning off the water, unless essential, as the water keeps coming back. Would this be a sign of bad workmanship, or the copper pipes reacting to the concrete? If he just used copper pipes, is there anything I could ask him to do to ensure this doesn't happen again? Is there any protection he could put around them? Never have I so looked forward to someone returning from their holidays! Many thanks.

[@Benzknees]

Pipe previously in damp area below DPC level, presumably surrounded by moisture holding insulation? Seems like a recipe for yet more leaks in future.

[@markerobinson]

Thanks great video, do you have any tips for protecting the pipework when making good the floor , ie packing underneath the pipes where the old concrete has been removed under the pipes and covering the pipes from wet cement. I was thinking about packing with sand and covering the pipes will lagging material

[@completepreservation]

Brilliant video and explanation bud👍 it looks like the copper pipe has a dent in it 🤷

[@TheDIYGuy1]

Your welcome. Yep, unfortunately they hit it when they dug the floor up

[@violatindle4793]

Good Video. But is there a way to have a removable floor so you dont have to continue to break up the concrete in different spots to find the leak? I would like it to be say 12 inches wide and run the entire length of the floor where the pipes are. Thank you. this could save us a lot of money.

[@adrianmircea9590]

awesome job mate

[@TheDIYGuy1]

Thanks 👍

[@simoncasey7062]

What would the concrete mix be to back fill the hole? Also, should it be sharp sand or builders sand

[@peterwickett9088]

Top video 👍

[@TheDIYGuy1]

Thanks 👍

[@bdblazer6400]

an anglegrinder may be a better chioce to cut in tight spaces. just make sure to pull the pipe apart while cutting and fire prot

[@TheDIYGuy1]

For the more experienced it's certainly an option. I don't recommend it for the DIYer

[@richarddavis1599]

Nice video 👍 i would have cut the section of pipe with the little dent in also.

[@TheDIYGuy1]

Thanks. I wanted to but the homeowner wanted to save on more floor being dug up due to the tiles.

[@theshuff]

if the weak and leak point was "only" the solder joins ant not a hole in copper pipes, in this case, the "easy way" shouldn't be to only reflow them with new tin ?

[@RedSevenLinux]

It's my understanding that it's against plumbing code to have solder joints underneath a concrete slab. Is that not the case here for some reason?

[@sad-tb9nt]

cool stuff out there! Keep it up!!

[@TheDIYGuy1]

😊 will do

[@Pitifulexcuse]

Great vid! Thanks for posting it. Is there any reason not to use an angle grinder to cut the pipes?

[@TheDIYGuy1]

Thanks a lot 😁

[@GeoffreyPapin]

How did you noticed the leak ?

[@randycny]

Looks good. But aren't you a bit concerned with the dent in the pipe on the right at 11:51?

[@TheDIYGuy1]

I wanted to replace it but the home owner didn't want to dig up anymore floor so he asked that I leave it. Unfortunately I can only do what someone wants me to.

[@77costa77]

using bread in a closed loop radiant system could be catastrophic.. you would only really use bread as a last resort in an open loop system- such as a home domestic water system- this way the bread could exit the system through a faucet.

[@tommyknightly1659]

Great detailed videos

[@TheDIYGuy1]

Glad you like them!

[@Bob-ed3qi]

Great channel bud,do you know the internal diameter of hep20 15mm plastic pipe,I know 15mm copper is approximately 13mm

[@diyjohn9584]

I heard there is a tool called multi-tool or oscillating tool to make the cuts easier

[@TheDIYGuy1]

Yep you can use one of those too. Wasn’t included in this video as not all DIYers will own one

[@mkdavo]

I'd try fernox f4 before digging up floor.

[@Mr_Ashley]

“Should have a drain valve”, yeah, it is a nice surprise when you find one, to then always almost find it has a stuck washer inside……..plumbing 👍👍

[@TheDIYGuy1]

Haha it happens for sure

[@stuartjones2242]

great video 👍👍

[@TheDIYGuy1]

Thank you 👍

[@grayhalf1854]

What's the deal with digging out a section of concrete floor... do you ever need to worry about affecting its structural integrity? Also, how is that hole in the floor going to be filled? Sand and cement? Good job anyhow 👍

[@TheDIYGuy1]

Cement, after the pipe has denso tape applied

[@darrellholland1523]

Whats wrong with using a dremel twice as fast?

[@TheDIYGuy1]

There's nothing wrong with using a Dremel but this is a guide for DIYers and many more people will own a hacksaw than a Dremel

[@noinfoyoublabbermouth3768]

Why not try to bypass the old copper and move to above ground and use pex

[@geotj58]

OK NOT BAD, BUT YOU DRAINED THE SYSTEM ABOVE THE LEAK! SO HOW DID YOU REMOVE THE REMAING WATER BELOW THE DRAIN OFF, THATS A GOOD 6 INCHES OF HEAD WATER...WAITING FOR AN ANSWER!

[@TheDIYGuy1]

In the video there is a section where I explain the use of a wet vac to remove the water and I show this process being done

[@marksmeaton1564]

I would have cut the second pipe past the dent on the right hand side.

[@TheDIYGuy1]

They didn’t want me to do that unfortunately

[@ricko6514]

Hey there. Here from the midwest USA. I had a cold weather event where the cold copper pipe bursted after a thaw. The length of the swollen 1/2 pipe was beyond reach so no fix coupling to repair the pipe would work. Is there a way to repair swollen pipes at the broken point without replacing then entire length of it? sharkbite repair couplings were either too small or too big.

[@TheDIYGuy1]

Thanks for sharing

[@sodhi1697]

Hi you’re genius… I wanted to ask you my boiler keeps loosing pressure looks like there is a leakage underfloor could you please tell me how to find out where will be the leak? I can’t see the leaking water anywhere

[@Lucasimo]

You can do a hydraulic pressure test on the heating pipework at 6 bar (make absolutely sure you isolate the boiler from the test as 6 bar will cause the safety valve to dump the water). A hydraulic pressure test will show where the leak is. My slow leak was a tiny pinhole in a radiator. Would not have found it were it not for a hydraulic pressure test. You will need to know how to do this test so read up on it first. Make sure to get all the air out of the pipework and the radiators prior to the test.

[@Kyle_da_athlete]

Check your boiler first if there's no signs of leakage. Mines was losing pressure. The issue was that the expansion vessel was holding water and needed to be repressurised. A job that I did myself. And it holds pressure now. So try those solutions before digging up or looking for leaks underfloor

[@hazmat5749]

You can get leak sealer additives to put in the system to deal with slow drips. Might be worth a try before you take up your floors.

[@mortenmerstrand5473]

How did you find the leak?

[@TheDIYGuy1]

A thermal imaging camera was used to identify the cause of a boiler pressure drop

[@TheKeithshiels]

Could you use plastic hep pipe and fittings instead of copper

[@TheDIYGuy1]

No there’s too much tension for that

[@TheKeithshiels]

@@TheDIYGuy1 reason asking is moving radiator from current location to 3 feet further down wall. Was hoping if dug up concrete floor and cut into existing pipes could use quick fittings if dug deep to get them on. Is it viable? Followed few other videos around plumbing and put into practice today taking radiator off same wall without draining system. Had added issue with dodgy valve so luckily from following your channel had brass stop ends so wasnt too bad. Thank you so much your channel is fantastic

[@stuartjones2242]

could you just de-solder and clean and flux and re solder back up ?

[@TheDIYGuy1]

No you wouldn't be able to, due to tension on the pipe.

[@MisterStuzy]

Could you have used a multitool saw?

[@TheDIYGuy1]

Could have but I chose not to because a lot of DIY’ers may not have one

[@MisterStuzy]

@@TheDIYGuy1 ah gotcha. Makes sense. cheers.

[@TheDIYGuy1]

👍

[@A2Z1Two3]

Use a braided flexible hose , end of , job done , no soldering , no mess , no problem .

[@pcno2832]

I wonder if contact with the concrete was what caused the original pipes to leak. I've seen leaks in free-standing cold and hot water supply pipes, but never in a free-standing heating pipe. But I grew up near a neighborhood of 1950s houses with radiant hot-water heating in the slabs and nearly every one of them has leaked (they usually replace everything with radiators in those houses). Maybe it's a corrosive reaction between the concrete and the copper; I doubt that cracks alone would cause that many leaks. In a case like this one, I wonder if it would be worthwhile putting some sealer or membrane on the pipes before patching the concrete so the concrete won't touch them this time around.

[@godbluffvdgg]

As a plumber for 35 years...Beautiful work...Looked like a nightmare...I'd pass on that job...There's easier money to be made -:) ...Good health and easier work for you and yours going forward...Cheers!

[@TheDIYGuy1]

Thanks a lot 😄

[@jamiebarnes3539]

why did you leave the dent in the pipe why not cut it out ?

[@sacj80]

I wonder how a carbide multi tool would work.

[@TheDIYGuy1]

It would work

[@gillescollin54]

Why leave that dented section?

[@TheDIYGuy1]

I was asked not to replace it by the homeowner. They didn't want to dig anymore floor up

[@Asian_Connection]

how does concrete burn, I would protect the wall instead!

[@TheDIYGuy1]

Denso tape

[@jessebrown1497]

WHAT ABOUT THE DENTED SECTION? That may leak in coming years

[@daviddempsey2531]

If there’s to much water use compression fittings .

[@TheDIYGuy1]

Thanks however you will likely struggle with pipes under such tension.

[@gregm2557]

Compressions should never be used where the joint isn’t going to be accessible

[@gasogb1783]

How did you find the exact location of the leak under the concrete ?

[@TheDIYGuy1]

Found using a thermal imaging camera

[@gasogb1783]

@@TheDIYGuy1 Thanks, better if you could have shown that as well. May be a future video. :)

[@naratipmath]

wait how to close the hole on the floor? That is not DIY?

[@benregler9872]

Great video 😁 A multi tool would be my weapon of choice to cut those pipes but then not every Diyer may own one.

[@TheDIYGuy1]

Absolutely, that's why I didn't mention that method. There is also more room for error with a multitool

[@blissy1]

Why are the pipes not lagged in the floor, lot less chance of a leak if not in contact with concrete plus less heat loss

[@TheDIYGuy1]

Absolutely, someone bodged it back in the 90s

[@MyKharli]

Uncoated pipes in concrete will corrode fast .

[@TheDIYGuy1]

Absolutely will. This install was done in the late 90s and I'm surprised it's lasted so long without issues

[@brezzz0077]

A plumbers favorite tool is a grinder

[@TheDIYGuy1]

😄

[@jeremyrichards8327]

The 3 rules of successful soldering are: cleanliness, cleanliness and cleanliness!

[@TheDIYGuy1]

🙂

[@Fester_]

Banging the coupling, no.

[@seanmcgrath9167]

id have probs taken that repair piece right up past that dented tube.....OCD lol

[@TheDIYGuy1]

Me too. But the home owner didn't want that done

[@bullbutter9699]

Fixing is EZ finding is a Challenge

[@TheDIYGuy1]

Would you like a video on that? 😉 You are correct it can be a challenge.

[@bullbutter9699]

@@TheDIYGuy1 sure that would be Awesome😀

[@優さん-n7m]

why are pipes put under I mean, inside concrete floor to begin with?

[@parisiadrian]

Why didn't you just retouch the solder on the old pipes?

[@TheDIYGuy1]

Not a good idea.

[@BasementEngineer]

Anybody that runs any plumbing or piping directly under a concrete floor in a residence is an idiot! Many years ago I was acquainted with an electrical engineer who owned an avant-garde house on a slab just outside of town. It was a beautiful place indeed. His water well was in front of the house just by the front entrance. The utility room was at grade towards the back of the house, perhaps 25 feet away from the front. Two copper pipes connected the well pump to the utility room where the washer/dryer/water heater were located. During one visit the house's concrete floor was jack-hammered to expose the well piping to find a leak, which was easily repaired. I recall advising said engineer: "Frank, put in a pipe chase consisting of 6" drain pipe, and push the well piping through that. It will make future servicing so much more simple". Replied Frank: "Naw, i'll never leak again.....!" I was just a dumb mechanical engineer. Within 1 year Frank had to do all that jackhammering again...

[@telosfd]

Where is solder at 10:47?

[@TheDIYGuy1]

The fittings used are Yorkshire/solder ring. The solder is inside them

[@paul1962uk]

Much easier with an oscillating multi tool

[@TheDIYGuy1]

Absolutely. However it's best for me to show DIY'ers this way as not so many people will own an oscillating tool. Plus mine wasn't on the van on this day 😂

[@andyedwards6124]

That big ding in the pipe is stressing me out, don't think I could have left that there

[@TheDIYGuy1]

It wasn't my choice unfortunately. Home owner didn't want to dig anymore of the floor up to fix it.