Leaking compression joint(cold)

That's the beauty of plastic, you can cable it through joists, just need to keep your holes nicely inline.
Never worried where the fittings are, fitted properly they don't leak.
Nowadays the emphasis is on fire safety and dumbing it down. No need for expensive plumbers.
 
I tighten them up tight never had a leak yet,
 
PTFE bone of contention on here :giggle:
I have using something for 50+ years, paste+hemp and then tape when it came out, changed to ptfe cord about 10-15 years ago.
If you think it's a bodge that's fine, it's worked for me both domestic and commercial and I didn't get call backs.
It's what works for you, not what people tell you should or shouldn't do.
Too many people think theirs is the only way something should be done, they forget, theirs more than one-way to skin a cat.
Here here i ve been reading the posts and there a lot crap
Over a 40yr period of plumbing i have seen plumbers fit olives dry on compression joints often after time i have seen them weep and corrosion appear around the joint. Not all the joints of course.
I have seen ptfe used under and over an olive. seen them tighten and undo put ptfe around then do up again
I personally make sure the pipe is cleaned wiped and coated in a teflon paste and tighten well. I change the brass olive for copper
and tighten well. i dont get leaks. But it doesnt make brass olives crap or ptfe crap its choice
Horses for courses. If your joints leak you have done something wrong
 
If the fitting has a brass olive you may not have tightened it enough, a small amount of plumbers mate smeared on the jointing surface can help.
Is the 'plumbers mate smeared on the jointing surface ' a type of silicone grease. And is it suitable for potable water supply use ?

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Your better off using Boss Green.
 
Talking to my BIL a few weeks ago he was saying the local building inspector will only allow continuous runs under the floor.
Oh dear, I plumbed my conservatory & utility room underfloor in plastic, at least it's not part of the main house as such & suspended floors.


If you run underfloor heating in a room it’s always continuous pipe and termination is above the floor.

I’ve no idea how different chemicals would affect the plastic pipe work.

I can only presume the manufacturer has tested their pipe work to cope with anything it may come into contact with.
 

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