Extending vent pipes above photovoltaic modules

[earshavewalls]

We are having a discussion on how high above the module surface that a plumbing vent must be extended to provide proper venting. We are in California, so we are on the CPC (revamped version of UPC). Section 906.0 of the 2010 CPC requires vents to extend to a minimum of 6" above the roof surface. Some feel that this number should remain at 6" above ANY surface (on a sloped roof) to match the required height above the roof, but others feel that a minimal distance (2" has been proposed) above the modules.

I just wanted to hear more input on this. I am leaning toward the 6" side, but I also see the desire for 2" above the modules (someone brought up shading......come on....really? a 2" vent?).

What do you do in your area?

Thanks,

Wayne

 

[Span]

I'll accept 2" above flashing, because it is for public sewer to breath.

I also ask a lot of GC & plumber one question. " If a new house with one bathroom, kitchen & laundry, what will be the vent pipe size & how many?

 

[Gregg Harris]

We are having a discussion on how high above the module surface that a plumbing vent must be extended to provide proper venting. We are in California, so we are on the CPC (revamped version of UPC). Section 906.0 of the 2010 CPC requires vents to extend to a minimum of 6" above the roof surface. Some feel that this number should remain at 6" above ANY surface (on a sloped roof) to match the required height above the roof, but others feel that a minimal distance (2" has been proposed) above the modules.I just wanted to hear more input on this. I am leaning toward the 6" side, but I also see the desire for 2" above the modules (someone brought up shading......come on....really? a 2" vent?).

What do you do in your area?

Thanks,

Wayne

Probably a large portion of the state will never see snow fall or freezing temperatures that would effect the performance of the vent if it where shorter. The other factor to consider if it where 2 inches above the flashing on a sloped roof could be leaves etc. building up and blocking the vent. My vote would be to stay with 6"

 

[Keystone]

On the opposite side of the states but I'll throw in my 2cents. I would agree with Gregg, leaves etc. building up. Shading of the PV panel, hummm that wouldn't be my first priority. Raise it 6" above.

 

[ICE]

(someone brought up shading......come on....really? a 2" vent?).

You would be surprised.....that's why we use glass pipe for that.

 

[pyrguy]

You would be surprised.....that's why we use glass pipe for that.

Pics or it didn't happen!!!

We have that issue here. They like to cut off the vent right at the top of the boot instead of adjusting the panel spacing.

 

[ICE]

We see at least one installation of solar panels per week and sometimes two.

I don't get it.

Do people not understand that the next re-roof will be much more expensive.

I am pretty sure that the solar companies aren't telling their customers about that because I've seen the panels on a roof that needed to be replaced now.

This almost makes better sense.

As unattractive as it may be, it's not as ugly as panels and it takes the place of roofing material.

This is in a neighboring AHJ so I don't know anything about it.

Spot the tool.

 

[pyrguy]

But just think what they are saving (?) on power bills.