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Brass Craft is a common stop in wide usage. We've used them for years with no failures. If there's a leak then your plumber need to fix them. Same with the floor. There should be no cold spots. While it's not an easy fix it's up to your plumber to make it right. I'm a GC too and I wouldn't accept sub standard work from my subs. BTW I'm also a Master plumber and we've installed a fair number of staple up radiant systems. They can be a pain sometimes working around obstacles but there's no excuse for cold (or hot) spots.It could be a matter of inadequate coverage or possibly a loop that's too long.