I just found one of my t joints appears to have a small leak. I first noticed the leak when I walked down to my unfinished basment and noticed a wet spot on the cement floor. Upon looking up, I noticed a really small moisture build up which would eventually turn to a drip down to the ground. The plumbers who installed all of the pex piping just one year ago should be coming out in the coming week, but I am wondering more on the quality of either the t-joint or connections of pex piping as I plan on finishing my basement in the next year or so which would include drywalling the ceiling instead of doing a drop ceiling.