Re: [RE-wrenches] White Paper on on the affects of a "snow, melt, refreeze process" (no pun intended)

2010-08-06 Thread Richard L Ratico
Lee, In Maryland? Dick Ratico Solarwind Electric Bradford, VT --- You wrote: Wrenches, Has anybody come across an analysis of the potential damage to a flat roof from snow on solar modules melting to form an ice layer on the roof and then forming subsequent layers as more snow melts or slid

Re: [RE-wrenches] White Paper on on the affects of a "snow, melt, refreeze process" (no pun intended)

2010-08-05 Thread Bill Hoffer
Lee I worked on a job on Washington pass in Washington state about 12 years ago, near the border of Canada in the North Cascades wilderness area. Design snow load was specified 200 #/sq ft as I recall (far greater than the forces on a module at 120 mph wind load) and the Cascades are known for w

Re: [RE-wrenches] White Paper on on the affects of a "snow, melt, refreeze process" (no pun intended)

2010-08-05 Thread Lee Bristol
Thanks Ray, my response compared the parapets to the snow dam under the modules too. On Thu, Aug 5, 2010 at 5:06 PM, R Ray Walters wrote: > I'd say that at this point, with all the old solar systems, flat roofs, and > snow we get in New Mexico and Colorado, that if it hasn't been a problem, it

Re: [RE-wrenches] White Paper on on the affects of a "snow, melt, refreeze process" (no pun intended)

2010-08-05 Thread R Ray Walters
I'd say that at this point, with all the old solar systems, flat roofs, and snow we get in New Mexico and Colorado, that if it hasn't been a problem, it won't be a problem. It definitely is not going to lift the panels; worst case is that it could build up and get past flashings, which is a prob

[RE-wrenches] White Paper on on the affects of a "snow, melt, refreeze process" (no pun intended)

2010-08-05 Thread Lee Bristol
Wrenches, Has anybody come across an analysis of the potential damage to a flat roof from snow on solar modules melting to form an ice layer on the roof and then forming subsequent layers as more snow melts or slides down the modules? If the sheet gets thick enough then the next bit of water coul