Screws In Flue Pipe

 
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Old 06-25-2008, 12:45 AM   #1
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Screws In Flue Pipe


I had a new furnace installed in attic and condensor outside.
I went upstairs after they left and had to silver tape and duct seal the bottom myself. Then I noticed there are 1/4" screws in the flue pipe system.
I thought it was against code to put screws in flue. Am I wrong?
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Old 06-25-2008, 09:02 AM   #2
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Re: Screws In Flue Pipe


I'd wait for the HVAC guys, but I think you're wrong, it's no screws in dryer vents, because of the lint, I'm not sure if that's a code or just common knowledge.

What else could you use that would stand up to the heat.



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Old 06-25-2008, 06:12 PM   #3
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Re: Screws In Flue Pipe


Quote:
Originally Posted by MattCoops View Post
I had a new furnace installed in attic and condensor outside.
I went upstairs after they left and had to silver tape and duct seal the bottom myself. Then I noticed there are 1/4" screws in the flue pipe system.
I thought it was against code to put screws in flue. Am I wrong?
Every code I know of REQUIRES screws in single wall vent.

Is this B vent or just single wall pipe?

OR PVC or CPVC?
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Old 06-25-2008, 07:38 PM   #4
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Re: Screws In Flue Pipe


I always thought you had to install at least 1 so as to keep the pipe from coming apart
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Old 06-25-2008, 11:16 PM   #5
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Re: Screws In Flue Pipe


Quote:
Originally Posted by mickeyco View Post
I'd wait for the HVAC guys, but I think you're wrong, it's no screws in dryer vents, because of the lint, I'm not sure if that's a code or just common knowledge.

What else could you use that would stand up to the heat.



.
Is this code or in the UBC? Kind of makes sense in a way, but how else would you secure single wall in a mechanical way other than tape?
Our hvac guys use 3 screws per connection in single wall.
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Old 06-27-2008, 12:41 AM   #6
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Re: Screws In Flue Pipe


3 evenly spaced screws for b-vent. Obviously can't be done with dryer vent/
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Old 06-27-2008, 11:41 AM   #7
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Re: Screws In Flue Pipe


B-Vent requires screws as well. They are a special screw though, shorter, so as not to pierce the inner liner. Try to always place AT LEAST two screws opposite each other. One is really insuffiecient to prevent a pipe from coming apart. Best practice is minimum of 3 up to about six inch.
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Old 06-27-2008, 11:45 AM   #8
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Re: Screws In Flue Pipe


Quote:
Originally Posted by MattCoops View Post
I had a new furnace installed in attic and condensor outside.
...Then I noticed there are 1/4" screws in the flue pipe system.
I thought it was against code to put screws in flue. Am I wrong?
The 1/4" hole could have been from combustion analysis. Not sure of the code in your state, but it may be required when commissioning new equipment. They may have forgotten to place the Foil/aluminum tape over the holes once completed.
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Old 06-27-2008, 05:25 PM   #9
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Re: Screws In Flue Pipe


Last I knew screws were NOT allowed for B vent in any shape or form. Can anyone cite the code where they are required?
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Old 06-27-2008, 05:42 PM   #10
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Re: Screws In Flue Pipe


Screws are not required in DC.

In fact there are brands that tell you not to insert screws in them.

I think the biggest mfg fear is you will probably puncture the liner. There are atleast two companies that sell a snap together system.

If a screw has to be inserted I use a 3/8 screw and tape it.
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Old 06-29-2008, 12:42 PM   #11
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Re: Screws In Flue Pipe


Quote:
Originally Posted by 22rifle View Post
Last I knew screws were NOT allowed for B vent in any shape or form. Can anyone cite the code where they are required?
Typically Here in Canada, "The Authority having jurisdiction" set standards. However, if the manufacturer requires screws or something not normally used, you would default to manufacturer specs. So long as the item in question has been ULC tested.
I still haven't reached the "Critical 15 post minimum" so I'll be unable to paste links. It's out there if you look. Even in the states it appears as though manufacturers tested item(s) IS the code above authority having jurisdiction.,
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Old 07-09-2008, 06:37 PM   #12
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Re: Screws In Flue Pipe


we aways use screws in single wall paipe, just to keep it from slipping apart. Even the best tape loosens after awhile (UL 181 tape). If anything puts pressure on it tape alone isnt enough.

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