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Do you need to vent a horizontal offset in a vertical stack for a single family residence?
Wiki User
∙ 16y ago
The 2006 IRC does not address this application. The IPC however, states the following and is commonly referred to for clarification if the IRC is unclear or does not address any particular subject: SECTION 915 VENTS FOR STACK OFFSETS 915.1 Vent for horizontal offset of drainage stack. Horizontal offsets of drainage stacks shall be vented where five or more branch intervals are located above the offset. The offset shall be vented by venting the upper section of the drainage stack and the lower section of the drainage stack. 915.2 Upper section. The upper section of the drainage stack shall be vented as a separate stack with a vent stack connection installed in accordance with Section 903.4. The offset shall be considered the base of the stack. 915.3 Lower section. The lower section of the drainage stack shall be vented by a yoke vent connecting between the offset and the next lower horizontal branch. The yoke vent connection shall be permitted to be a vertical extension of the drainage stack. The size of the yoke vent and connection shall be a minimum of the size required for the vent stack of the drainage stack. As an inspector there is also language in the code that applies residential single family dwellings as 3 floors or less and I would not apply the IPC venting requirements unless there where more than 3 floors or a substantial reason for concern, such as large volume (five or more branch intervals) on the stack before the offset. This is however my opinion and I am not the Authority Having Jurisdiction. Their opinion RULES! Hope this helps! Terry SAFETY FIRST and ALWAYS!
Wiki User
∙ 16y ago
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