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#4457558 - 07/12/17 06:54 PM Need to talk plumbing...
double vanos Offline


Registered: 08/05/04
Posts: 1885
Loc: 5600 feet elevation, Arizona
Ok, I'm working on a 100 year old cottage. I'm using both brass fittings and steel piping and PEX. I used teflon tape for all the screw together joints. Tightened them up pretty good too. Seems I have leaking (weeping) at all the teflon tape joints. The PEX stuff looks ok. The old plumbing that came out had some kind of joint putty on them and zero leaks for a long time. Any body care to chime in on my problem?

Would like a recommendation for a good plumbers joint putty. The internet is loaded naturally, but I need info from someone here who knows what works. Got a lot of work held up by this problem....
As always, thanks in advance guys....
DV
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#4457565 - 07/12/17 07:06 PM Re: Need to talk plumbing... [Re: double vanos]
sleddriver Offline


Registered: 02/06/10
Posts: 4603
Loc: Central Texas
"Regular" white Teflon tape is very, very thin. As such, it requires many wraps sometimes to seal. Yellow gas tape is thicker. You may also have to use pipe dope + tape.
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#4457580 - 07/12/17 07:21 PM Re: Need to talk plumbing... [Re: double vanos]
fdcg27 Offline


Registered: 09/25/09
Posts: 15699
Loc: OH
IME, pipe dope works well on threaded pipe.
Just say no to Teflon tape.
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#4457586 - 07/12/17 07:26 PM Re: Need to talk plumbing... [Re: double vanos]
NStuart Offline


Registered: 12/28/16
Posts: 278
Loc: Sav ga
Parker sells the food grade paste, I put that [censored] on everything 😀
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#4457590 - 07/12/17 07:29 PM Re: Need to talk plumbing... [Re: double vanos]
Donald Offline


Registered: 03/21/04
Posts: 20457
Loc: Upstate NY
Teflon pipe dope and Teflon tape work well.
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#4457602 - 07/12/17 07:47 PM Re: Need to talk plumbing... [Re: double vanos]
double vanos Offline


Registered: 08/05/04
Posts: 1885
Loc: 5600 feet elevation, Arizona
Seems Rectorseal is liked a lot. Which to use - Rectorseal T plus 2 or Rectorseal No 5? Any ideas or favorites between the two?
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#4457622 - 07/12/17 08:00 PM Re: Need to talk plumbing... [Re: double vanos]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
Go to a real plumbing supply in your neighborhood. The place with all the contractor white vans outside that have HVAC on the side, and ladders and copper tubing on top of the roof.

Go to the counter, be friendly, describe what you are trying to accomplish and listen to the counterpersons advice because he knows as much as the plumbers milling around. Snap some photos and bring an iPad with you to show the images...phone screens are too small for the guys who have been doing this long enough to really know their stuff smile

It sounds like you are attempting to further cobble 100 years of cobbled together attempts at plumbing by previous owners.
It is a recipe for failure.
Not because of your ability or inability...but because it is the nature of old houses with old plumbing.

Home Depot and Lowes cannot help you....
Fellow Do-It-Yourselfers cannot help you...
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#4457632 - 07/12/17 08:11 PM Re: Need to talk plumbing... [Re: double vanos]
Danno Offline


Registered: 10/07/12
Posts: 1991
Loc: Northern Ontario, Canada
As per a similar problem, advice from my plumber BIL - pipe dope...is the dope.
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#4457638 - 07/12/17 08:15 PM Re: Need to talk plumbing... [Re: double vanos]
walterjay Offline


Registered: 04/12/09
Posts: 236
Loc: Maryland
Wrap it with teflon tape and than coat it with pipe dope. Problem solved. Rectorseal, Gasoila of Laco paste are good. I have found Gasoila to be best.

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#4457645 - 07/12/17 08:22 PM Re: Need to talk plumbing... [Re: double vanos]
gomes512 Offline


Registered: 07/02/07
Posts: 684
Loc: Chicago, IL
Good tips already posted, your likely using thin tape. With the thin stuff I wrap heavy and slap dope on top of that, as others have already mentioned... Also make sure your wrapping in the correct direction. Gasoila dope works well but I've been using the dope made by Wolverine Brass a lot lately and it hasn't given me any leaks either.

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#4457660 - 07/12/17 08:32 PM Re: Need to talk plumbing... [Re: double vanos]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
All these well intentioned responses are missing the big picture.

They are not seeing what your project actually is or if you have followed proper installation methods. The fact all of your teflon tape connections are leaking suggests inexperience.

When you say "steel pipe" do you mean galvanized pipe for potable water or black iron pipes more typical of gas lines?

Either way, In a 100-year old home that was plumbed with steel you should be gutting it all and replacing. All of it because it is plugged up like an old fat guys arteries wink


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#4457661 - 07/12/17 08:32 PM Re: Need to talk plumbing... [Re: double vanos]
Oldtom Offline


Registered: 07/05/14
Posts: 329
Loc: Cecil County Maryland
The best pipe sealer I have ever used is Loctite PST 567. A small tube costs 25 dollars and it is worth every penny. In this county gas piping is tested at 60 PSI, even though normal operating pressure is less than 1 PSI. The piping must hold pressure for 24 hours with no leak down. Loctite fixed a leaky gas piping system that would not hold pressure. I use Loctite 567 on every threaded pipe joint EXCEPT plastic. The instructions are very clear about not using this product on plastic pipe. Available at Grainger and Fastenal ( check stock by phone )

Good Luck :-)

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#4457698 - 07/12/17 09:09 PM Re: Need to talk plumbing... [Re: double vanos]
Papa Bear Offline


Registered: 08/11/05
Posts: 7050
Loc: Leamington, ON, Canada ..... r...
I was a pipefitter at Chrysler Corp Canada for nearly 10 yrs.
We used Master's metallic dope http://www.gfthompson.ca/pipes.html
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#4457720 - 07/12/17 09:27 PM Re: Need to talk plumbing... [Re: double vanos]
pkunk Offline


Registered: 03/19/11
Posts: 257
Loc: NM, USA
Teflon tape is used just to lubricate/seal plastic pipe threads. Nothing more-nothing less
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#4457737 - 07/12/17 09:49 PM Re: Need to talk plumbing... [Re: double vanos]
Stelth Offline


Registered: 02/24/11
Posts: 2030
Loc: California
I am a plumbing foreman for a mid-sized mechanical company. I make money by making leak-free joints the first time. If you're using teflon tape, you need to start by winding it in the right direction. If you point the threaded end of the pipe at your face, you would wind the tape clockwise. Otherwise, the act of tightening the pipe tends to push the tape out. If you are working on potable water lines, and you want to use dope, use a non-toxic thread sealant like the various Teflon pastes that are available. I personally like to brush a thin coat of dope into the root of the thread, and then apply teflon tape. Other people use different methods with success, but that's mine. If you're using Rectorseal, T+2 is good for potable water.

As others have pointed out, cheap import teflon is not as good. It's not useless, but you'll probably have an easier time with Blue Monster, or the pink or yellow tapes that are available.
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