We were given the go-ahead from a home builder whom we are doing lots of work 
for, to cover attic vents on their roofs, if necessary. These are typically 
about 4" off the roof. 
I suspect covering plumbing vents may be ok as well but I'd be doubtful about 
combustion vents. 
Did you mean 1.5" or 1.5' (as you typed)? 

I'm actually just waiting to hear back from the home builder's plumbing 
department to find out what, if any, the minimum height for the plumbing/sewer 
vent is.  I'd like to cut them shorter in some cases where they will cause some 
shading on the array. It would be great if we could cut them right down to the 
4" mark so we could go right over top of them. 

benn

> On Sep 23, 2014, at 4:48 PM, Bruce Leininger <br...@gridalternatives.org> 
> wrote:
> 
> Hi all.  We're designing a system on a roof that is literally infested with 
> plumbing, exhaust and combustion vents.  The combustion vents are PVC and 
> none of the vents are more than 1.5' above the roof.
> 
> A racking company says that we can cover them with modules, since the modules 
> will be at least 4' above the roof.  They have not yet provided any building 
> code references to say that this is ok.  Do any of you know if the building 
> code allows this?
> 
> Thanks.
> 
> Bruce
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