So today I completely did the water all upstairs, down to the water heater, and then under the house to the source. I used all PEX except for where the upstairs sink and toilet are. I only had leaks where the toilet and sink valves connected, the treaded part. All the PEX didn't leak at all. I had to remove the water heater to do the pipes behind there and to the washing machine. I'm to tired to go into more detail so if you have any questions let me know!