[ltkaknm]

I am in the process of adding a toilet to a former porch/pantry in an older home and was wondering if the toilet vent height needs to be at the highest point of the roof, or can I vent it through the roof of the porch/pantry. There are a number of windows on the second floor and I do not want to vent it incorrectly.

Thanks for your help,

Tim King

[ballengerb1]

You can't vent from the lower roof line. Check you local building inspector to see if they allow an AAV instead of a vent. Your other option is to try to connect to the existing vent stack if you don't have to tear down the house to get to it.

[speedball1]

Bob's correct. Sections 1404.4 and .5 Of the Standard Plumbing Code, (Extensions Through Wall) allows you to extend vent terminals through a wall providing that,
1- No vent terminal shall be located directly beneath any door, window or other ventilating opening of the building.
2- No vent shall be located within 10 feet horizontally of such a opening unless it's at least 2 feet above the top of such opening.
In short, you may connect to a existing vent out the roof but you ncan n ot vent from the porch. Regards, Tom