You should be able to see if the main shutoff in the house goes back into the slab. If it doesn’t then the remainder of your plumbing is in the walls. And if it isn’t then you can always route stuff through the attic to bypass anything in the slab past the main shutoff valve.
Do you have outside faucets that come up through the slab and into a wall?
The spigot in the garage looks like it comes off the slab waterline. The outside one, as far as I can tell from the pipe configuration at the shutoff valve just above the slab, goes through the wall along with the washer and bathroom lines.
If I find a leak under the slab, I think I’d do just what you suggested. That would be the least invasive way to go, anyway. But I’m pretty sure I don’t have a leak under the slab…my repair guy is coming in a few days to install a new faucet so I’ll double check with him.
If you have to run pipes in the attic box them in and vent through the ceiling so the house heat keeps them warm.
I had a leak that was consuming about 2,000 gallons a month. The plumber checked the water pressure and identified a faulty pressure valve where the water enters the house. It was supposed to hold the water back when no water was being consumed, but was not working. I have no idea where the water then went, but replacing that valve fixed the problem.
I went in to pay the $114 bill today. Having tentatively decided this was a billing-cycle issue rather than a water leak, I asked the woman to check the read date on that bill. Sure enough it was for Aug 8-Sept 8, the height of the most recent dry spell when I was water my gardens. She looked at my most recent reading and it was only 3600 gal, which is less than the usual 4000 even.
So…I don’t have a water leak, AND now I know several ways to troubleshoot for one! Thanks so much to everyone who took time to advise me.
Well, that’s a relief!
having paid the bill then ‘that’s water over the dam’.
Reported.