Under my sink there is a leak somewhere which is causing the concrete floor under the sink to be soaked and it's seeping under the slate floor too. I can't seem to work out where it's coming from. I know it's hard to know without physically looking, but wondered if anyone had any ideas or pointers.
All of the pipes seem dry and seems to only happen when either the washing machine has been on or after washing up a lot. I opened up the waste to ensure the pipe is clear and it is. I'm wondering if it's the mains water in but below the surface. Below is a picture of under the sink.
Any help would be greatly appreciated!
Blue – in/out to dishwasher (not in use)
Green – water to washing machine
Orange – washing machine waste
Yellow – mains water into house
Red – waste pipe going into the floor for sink, washing machine and dishwasher
Best Answer
Check the seal around the faucet, around the sink, and between sink and backsplash by having someone pour water there while you look below.
Failing that, wrap toilet paper around all the pipes. Wait. Check for a wet spot on the toilet paper. Here's your leak. This works better with colored toilet paper (pink, blue, whatever) as it becomes darker when wet.