Vertical venting garage heater?

[ride92]

Does anyone know what the requirements and clearances for running the B-vent thru the roof if it come out next to the vertical wall of the second story? I have hardie board cement siding and I’d like to run the vent almost straight up from the heater I’ll mount to the garage ceiling. I don’t really see anything that states clearance to vertical walls? I saw something in the national gas code about single wall vent piping but nothing for the double wall b-vent. I’ve included a picture of where I’d like to vent.
Also what’s the best practice for a leak free flashing install? I’m familiar with roofing but wondering if there is any tips or tricks when doing the b-vent thru the roof?

 

[Gizzi]

Most B vent manufacturers usually state 1 inch clearance to combustibles. Regarding your vent location through the roof, it may not be a good spot. Looking at IFGC 503.6.4, you need at least 8 feet from a vertical wall or similar obstruction. Also need to pay attention for air intakes or windows. Your state may also have other stipulations regarding venting location. Perhaps the opposite side of the roof pitch may be a viable location?

 

[ride92]

Most B vent manufacturers usually state 1 inch clearance to combustibles. Regarding your vent location through the roof, it may not be a good spot. Looking at IFGC 503.6.4, you need at least 8 feet from a vertical wall or similar obstruction. Also need to pay attention for air intakes or windows. Your state may also have other stipulations regarding venting location. Perhaps the opposite side of the roof pitch may be a viable location?

The other side of the roof pitch faces the street so that is a no go. I was looking at the reznor and modine install instructions and they both said 6 feet from a vertical surface

 

[Gizzi]

The other side of the roof pitch faces the street so that is a no go. I was looking at the reznor and modine install instructions and they both said 6 feet from a vertical surface

If your state allows it, then you can use the manufacturer instructions for the clearances. State of Wisconsin where I am allows manufacturer ratings to take precedent.

 

[ride92]

I’m in Wisconsin as well! Hello neighbor. I’m going to just follow the diagram in the manual then that says 6’ from vertical wall I guess

 

[charliev]

If those vents are intake, you need minimum of 10 feet from them.

 

[PoorUB]

The other side of the roof pitch faces the street so that is a no go. I was looking at the reznor and modine install instructions and they both said 6 feet from a vertical surface

What ever mechanical code your city follows will probably have the most control over what you do. Most times the manufacturer will give recommendations, and state something on the lines of, "or the code in your area, which ever is more restrictive." Reznor and Modine can say 6 feet, but the inspector might want more.

Vents if intake for something like an air exchanger are and issue, as is the window if it can open.

 

[ride92]

The vents are bathroom exhaust vents and the window does not open

 

[zc15]

Ask your local building dept. They are often times helpful

 

[D45]

I would think 7 feet distance is acceptable, but just a guess

The manual for my Duravent 3" B-vent kit (0370) does not mention termination locations, other than roof pitches and termination heights:

https://www.northerntool.com/images/downloads/manuals/28794.pdf

The HD manual might be helpful, as it looks to be only 4' min

https://m.media-amazon.com/images/I/A16q2y+DKrS.pdf

 

[D45]

I guess it depends what brand you are installing, Modine, Reznor, Mr. Heater, etc