[RE-wrenches] Roof flashings on L-feet in high snow load conditions

Ray Walters ray at solarray.com
Tue Nov 13 11:12:40 PST 2012


HI Todd;

That's very interesting.  What roof pitch does that happen?  I'm 
guessing that at a step enough tilt, the frame damage is alleviated?
Also on your tall pole mounts what pole design do you use?  I've tried 
telescoping type, and guy wires on tall poles.

Ray

On 11/13/2012 12:08 PM, toddcory at finestplanet.com wrote:
>
> I have never had good results with roof mounted pv in our heavy (mount 
> shasta) snow area. the snow tends to creep down the glass and peel the 
> bottom of the frame off the module... and then the glass breaks as it 
> has no support in that area.
>
> so, around here... i do pole mounts.... WAY up in the air.
>
> todd
>
> On Tuesday, November 13, 2012 8:04am, "Troy Harvey" 
> <taharvey at heliocentric.org> said:
>
> Hi all,
> We have been doing PV installs for years with L-feet and silicone 
> without problems ever. Even still, gravity flashings seem attractive 
> in shingle roofs, to provide a second level of security, and a more 
> professional install (at least in perception). But the cost of these 
> systems in significant in high snow load areas where we often have 
> L-feet every 2 feet on center, to evenly load the structure below. In 
> todays costs, the feet could cost as much as 33% of the panel value.
> I'm wondering what other people are doing in high snow load areas?
> Also. I have noticed that there is a flip side to the risks. We have 
> found that unless you have good quality shingles, on a preexisting 
> roof, that sometimes the adhesive sticking the shingles together is 
> stronger than the low quality shingles themselves - adding risk of 
> trying to shoe horn flashing in after the fact. Your experience?
>
> thanks,
>
> Troy Harvey
> ---------------------
> Principal Engineer
> Heliocentric
> 801-453-9434
> taharvey at heliocentric.org <mailto:taharvey at heliocentric.org>
>
>
>
>
>
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>
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