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A leak is a way (usually an opening) for fluid to escape a container or fluid-containing system, such as a tank or a ship's hull, through which the contents of the container can escape or outside matter can enter the container. Leaks are usually unintended and therefore undesired. The word leak usually refers to a gradual loss; a sudden loss is usually called a spill.
The matter leaking in or out can be gas, liquid, a highly viscous paste, or even a solid such as a powdered or granular solid or other solid particles.
Sometimes the word "leak" is used in a figurative sense. For example, in a news leak secret information becomes public.
According to ASTM D7053-17, water leakage is the passage of (liquid) water through a material or system designed to prevent passage of water.

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  1. S

    Slow leak on my pressured central heating system

    Hi, new to this forum. I hope someone experienced out there can help me find the fix. We recently finished a building project and had a major re-design/move of all of our hot water (megaflo), boiler and central heating system. I am not a plumber nor do I know much about plumbing but I know...
  2. P

    Strange intermittent leak from kitchen ceiling

    Hi, I have a bit of a strange problem. A handful of times I've had a leak from the kitchen ceiling. This has always occurred when there has been a potential 'water pressure event'. The first two times happened exactly when there was a major leak down the road from us, the second couple of...
  3. D

    Leak ceiling ?what to do

    Hi. We have a leak somewhere as shown on the pfoto This is on the kitchen room. Directly above the space is our main bathroom, took the bath panel off don’t see any thing there. And nothing on site on toilet or sink Can anyone suggest the course of action to sort this before it gets worse and...
  4. D

    bathtub drain leak at elbow/shoe

    i have a leak at the elbow of the drain. i think its the limescale/calcium bluish greenish buildup thats causing the problem but im not sure. i cleaned up it up the best i can. its hard to reach,i would have to cut some drywall in the basement to fully access it. the tub is upstairs. i made the...
  5. C

    Leak hard to find - possible pressure issue?

    Hi all Totally new to this forum and hoping for some guidance. Two weeks ago we noticed a brown stain on our kitchen ceiling. Above it is the bathroom and airing cupboard where our hot water tank is. We have a closed system. The pressure had dropped on our boiler and so we topped it up (have...
  6. P

    Do i have a leak from by bathroom?

    There is a small area of discolouration on the kitchen ceiling beneath where the bath is located. I first noticed this a few weeks ago. Can anying help?
  7. K

    URGENT Constant Leak outside my house

    Hi Guys, I have discovered leak from some safety outside my house and have no idea what it causes it. Any ideas please?
  8. michcosg

    Possible to push a push-fit fitting back on a pipe at 3 bar?

    Hi Folks I am considering a job in council block flat which involves amending 15mm copper pipework under 3 bar of pressure. The problem is the local council seem to a bit hard to get a hold of to turn off the water! Thus my plan was to freeze the pipe with an electrical freezing kit and do...
  9. P

    Help me fix this leak

    Hi Would someone know how I fix this leak, the arrow shows where the water is coming from. My concern is that part b might be welded/soldered to part the copper pipe labeled c,. I’ve tried Shelley’s aqua putty, to just cover all the threads/join but other than making way more work for me, I’m...
  10. B

    Advice sealing leaking shower ?

    Hi all I have a leaking showing base. It’s a solid base not plastic and the walls/screen are 300mm wide plastic cladding. It looks like the cladding comes down onto the base not behind it which I think is correct. The leak is between them both going around the shower. What is the best...
  11. goblindog

    Where is the water going? (Leak)

    Bit of a long video here, but I'm really hoping someone can help. We clearly need to get someone in to fix the leak, but meanwhile I'm concerned where all the water is going to. There is no water damage in the surrounding area. Walls and floor seem perfectly fine. I can't work out where the...
  12. G

    Advice please on a leak that appears to come from the SOIL pipe

    Hy all, So i noticed the corner in the living room was getting damp. investigation showed that the corner skirting board that goes around the boxing in of the SOIL pipe was rotten with mould and the carpet was saturated. Obviously been going on for a long time. I dried the area out. I then...
  13. E

    Baxi solo 18he water leak

    Hi After some advice if poss, my boiler is dripping water and it seems to be coming from behind the heat exchange, is there anything behind that could be the cause or is it the heat exchanger ? If it is the HE should I get it repaired or would I be better getting a new boiler ? And if I get a...
  14. G

    Condensation or leak

    Hi wondering if anyone could tell me if this is a normal pool of water from condensation coming from pipes. Or does it look more like a leak? Am I best cleaning it all up then trying to identify any small leaks? Thanks
  15. O

    Where's my leak? They say not the boiler, but I am not so sure.

    Hello, Can anybody please advise. For months now our old Ideal Mini HE C24 (combi boiler) has had pressure problems. It won't stay above 1 bar. Occasionally I top it up, to above one bar, twice in a day, other times if I am happy to leave it about a 1/3 of a bar it won't complain for a week...
  16. N

    URGENT Temporary leak into tundish when boilers fires up

    Hi. I've just had my unvented hot water cylinder replaced. Works fine, apart from a slight trickle into the tundish when the boiler comes on after a period of inactivity for about 10 mins, which then slows to a drip and stops. He replaced the expansion vessel, all valves etc with new parts...
  17. E

    Wet Room Leak - new bathroom

    Hello, looking for some advice with regards to our new wet room shower, we have noticed a leak in the ceiling directly below the shower. We have run some tests and forced water down the waste using a hose and it seems to be fine, we’ve placed the hose in different areas around the shower and...
  18. S

    Oil boiler cutoff valve leak, fuel has got into insulation lagging

    Worcester Danesmoor 20/25, about 18 years old. B11 burner. We came home a few days ago to find our boiler in lockout, and not wanting to restart, instead simply doing a pitiful whine. We called an engineer out yesterday who, after a quick diagnosis, worked out that the capacitor had gone. We...
  19. R

    Leak - water getting into shower control unit

    Hi We have a Ideal Standard Connect Easybox Slim Built-in Shower - When using the shower, water is getting through the control faceplate and causing a leak. We were advised by one company that there was probably a problem with seals inside, and advised that they needed to buy a new unit as they...
  20. StevePJ81

    Towel Rail Stopped Heating Up After Leak

    Hi everyone, About a year ago we moved into a new property which has a towel heater as part of the Central Heating System. There are no thermostats as part of the valves, so after a quick look on google I believe it is a manual heater. In the summer a leak developed on the left hand side...