Robert Sorensen's posts

Posted by Robert Sorensen on Nov 10, 2015 10:10 pm

#1 -  Renewable Energy > Technical Discussion: Solar Electric System - Photovoltaic > Mounting panels to the roof
I have purchased an IronRidge solar panel mounting system to mount 33 280 watt panels to a metal roof. The plan is to use Iron Ridge slotted L foot to go between the rails and the roof and use  lag screws to fasten the L foot to the roof. With all of this in mind I have three questions:

1. What is the optimal spacing between the panel and the roof. Currently with the height of the L-Foot and the height of the rail the bottom of the panel frame will be approximately 4 inches off of the surface.

2. How long and what size should the Lag screws be? They will be driven into 2" X 6" purlins.

3. Should I use stainless steel lag screws?

Thanks in advance for any feedback you can give.


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