Troy:
I do not know what a gravity flashing is. Can you elucidate?
If you have adequate upload mounting strength and need more download
support, you can consider using additional L-fee that simply rest on the
shingles without penetrating the roof. We do that sometimes to take the
sag out of some DPW racking products if the span is long. This should be
an easy way to provide more snow load support. The caveat is that, on
pitched roofs, the resting feet do not provide any support down pitch.
William Miller
At 08:04 AM 11/13/2012, you wrote:
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
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