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screws in flue pipe

13K views 11 replies 9 participants last post by  Verbal 
#1 ·
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?
 
#2 ·
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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#7 ·
C-Vent & B-Vent

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.
 
#8 ·
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.
 
#11 ·
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.,
 
#12 ·
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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