Replies

1. 
   fredsmart48 | Jan 28, 2003 01:18am | #1

   How about taking 10" diameter piece of pvc centering the 3" pipe and fill the gap with foam in a can to insulate it.  Then going in side and insulate the pipe in the attic with the foam they use on cold water pipes to keep them from sweating.  I think you can get that in large size also. 

2. 
   JJ | Jan 28, 2003 04:22am | #2

   upc tells us that the vent pipe can be 6" min 12" max i've run across same problem and solved it by following code

1. 
   DRW | Jan 28, 2003 04:32am | #3

   I NEED TO UNDERSTAND 6" ABOVE ROOF DECK AND NO MORE THAN 12" IS THE CODE. I HAVE AT LEAST 18 TO 20" OF SNOW ON ROOF AT PRESENT.

1. 
   JJ | Jan 30, 2003 03:19am | #4

   i would say come spring measure from the roof deck and if you think vent is to small in diamiter you can always increase diamiter in attic if need and extend it out roof.

1. 
   DRW | Jan 30, 2003 07:39am | #5

   looks like my best option so far. thanks

1. 
   cmbb | Jan 31, 2003 03:47am | #6

   DRW; I had a similar problem. Found out I had about 7-8 ft. of horizontal run in the attic. It did not have enough pitch and was holding water. The water was condensing in the cold  stack that was above the roof. Only happened in real cold . I fixed it this summer and so far I have not had a problem. See if any of your vent pipes have standing water. Hope it helps.

2. 
   DRW | Jan 31, 2003 04:50am | #7

   thanks for your help. my problem is frost above the roof line between snow level and top of vent stack. to correct i have to re-open the vent with a screw driver, it's not frozen solid like ice cubes. i have checked for proper pitch on the horizonal run before.  

3. 
   cmbb | Jan 31, 2003 01:22pm | #8

   I had to use a 6' piece of 1/2" conduit to free mine. Somewhere you are getting excess moisture.

3. 
   rjw | Jan 31, 2003 03:11pm | #9

   Increase size/diameter.

   Snow above the vent should have much effect: when the snow piles over it, the warm moist aiur rising in the vent will melt the snow directlt above and the snow melt will just drain away.

   BTW, please turn off the ALL CAPS.  It is very hard to read messages in all caps, and using all caps on the internet is generally considered to be a form of shouting.  Thus some folks just skip messages in all caps and you limit the number opf responses you're likelt to get.

   _______________________

   "I may have said the same thing before... But my explanation, I am sure, will always be different."  Oscar Wilde

   
   

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   Edited 1/31/2003 7:13:58 AM ET by Bob Walker