roof details [RE-wrenches]

[William Miller]

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Jeff:

Some time ago I contacted Carlon and they claim that their PVC really is 
sunlight resistant.  They claim no physical degradation when exposed to UV 
and any discoloration is only microns deep.

The specification for this job was for a corrosion proof structure above 
the roof line, so EMT was out.  Nonetheless, we don't want discoloration, 
regardless of how thin, or any chance of brittleness, so after the photo 
was taken, the UV exposed PVC was painted with a UV resistant epoxy paint.

The rack system is the Direct Power aluminum Two Tier racks.  They are set 
on stainless strut so the racks can be adjusted to align precisely.  It's 
an expensive way to go but gives us good results.

The location is in Los Osos Californian.  That is Morro BAy in the 
background.  The beach nearby is exposed to the full fetch of the Pacific 
Ocean so salt spray is ever present.

Thanks for the feed back.


William Miller



At 10:32 AM 2/5/2006, you wrote:
>Hi William,
>
>Nice detail on the roof penetrations. And that looks like quite an 
>adjustable rack system - is that what I'm looking at?  Nice work. What 
>climate is this?  And yes posting web sites for comparison is great!
>
>One slight improvement suggestion would be to use EMT instead of PVC for 
>that section exposed to the sun that runs along the roof before going 
>down.  Especially if in a climate with hot sun and ice build-up in the 
>winter like we have in New England or in the mountains in the 
>Sierras.  The sun makes the PVC brittle over the years (and ugly) and the 
>ice damming pushes it around - I'd go with EMT there.
>
>Perhaps something you want to think about Peter.
>
>Best,
>
>Jeff

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