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Thanks for the reply LazyPup, I'm still a bit confused though. How is the size of the main vent established? Is the rule of thumb that it should be the same size as the main drain line? I know local codes vary but what does the IRC say about this? I assumed from the logic being these main vents basically serve dual purpose, for venting the structure and the municiple sewer, that the diameter needs to be equivalent in size to the main drain line.
You say that in freezing climates that all vents should be increased to 3" size one foot before going through the roof. Does this then assmue that the pipe diameter was less than 3". I don't understand this, I thought the drain piping needed to be at minimum 3", this would require a min. 3" vent stack then wouldn't it. I'm in Wisconsin and mainly interested in the cold climate rules.
Boy, this is so confusing, I'm basically just trying to understand a few rules of thumbs to go by. I really appreciate your input on all this.
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