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" <tahar...@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 [mailto:tahar...@heliocentric.org] tahar...@heliocentric.org Sent from Finest Planet WebMail.
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