roof details [RE-wrenches]

[William Miller]

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Peter:

If you'd rather not penetrate a roof with conduit, then you will be forced 
to run conduit greater distances over roofs.  I can not see myself running 
conduit to and over an eave and I can't see myself penetrating a roof and 
an eave to come down an exterior wall.  We connect our EMT to either the 
rack foot where it is lagged onto comp shingles or, in the case of any type 
of tile, to the strut that we use to mount our racks.  No conduit clamps 
are glued to roofing.

To illustrate this, I put up two pictures on my Web site:

-The first photos 
is: 
<http://www.mpandc.com/case_studies/Metal_to_PVC_Conduit_on_faux_slate.jpg>Metal_to_PVC_Conduit_on_faux_slate 
.  That is EMT coming through the roof and then we convert to PVC for 
corrosion resistance.  The posts are the DPW Power Posts, the strut is 
stainless (splices on back order).  The roofing is the faux slate (it is 
light, rugged and skid resistant).

-The second photo is: 
<http://www.mpandc.com/case_studies/Then_the%20racks_and_modules.jpg>Then_the 
racks_and modules  This shows the racks tilted up, some loaded and two 
tilted back down.  No quick connects were used in the making of this PV system.

I have never used the system that uses threaded rod through tile.  Sounds a 
little weak to me.

I hope the photos help explain the concepts.  I'm new to this web authoring 
thing.  I'd appreciate any feed back on it's effectiveness as a medium of 
exchange between colleagues.

William Miller









At 07:05 PM 2/3/2006, you wrote:

>William,
>I'd love to see your wrap on how to handle jb's on tile roofs and conduiting
>of multiple DC strings over slab or s-tile, IF there's a different or best
>way to approach each.  I'd also like to know more about what adhesives are
>being used out there, IF used, or recommended practice for rooftop jb's with
>conduiting on flat cement slab tile type rooftops, where I would think it
>possible for a good strong adhesion that can survive blazing surface heat.
>Even with someone tripping over or just a stressed conduit entry into a hot
>rooftop jb, is there an adhesive out there that works for 25 years in
>advanced life tests and will keep the jb in place, cold and hot, cold and
>hot for years?

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