Thanks for your considered reply.
As I mentioned, I am only in the planning stages.
My roof is extremely strong. It is made of 6 X 12 solid wood beams. I work with structural engineers regularly in my work so I don't have much concern for the actual strength of my roof. I have discussed my with some of them and will continue to do so.
You are right about the system moving around if there is an earthquake. I have lived in this part of the country for over 60 years... I know what goes on. There is a level of protection that is necessary but beyond that, the entire building would fall down and then, who cares. Lateral movement during seismic activity is indeed a problem. I was planning on a stainless steel cable system to keep the system in place. Also, there will be rubber pads between the weights and the roofing material. These will minimize any sliding around during minor temblers.
Codes in this area allow for heavy air conditioners to be placed on rubber isolation pads on flat roofs. My plan is similar. However, codes are not my baseline. Many homes here fell down during past quakes that were homes "made to code".
As I do with my work, my system will be severely over engineered.
Where I live, one cannot get away with un-inspected home improvements. I have lived places where nobody cares what you do to your house, but this area is not that way.
I mentioned before that we have many flat roofs in my area. Most commercial installers lean towards ballasted installations in those cases.
I always like to point out that the term "flat roof" will mean different things to different people. We have roofs in this part of the country that are really flat. I mean zero pitch. Basically, if it rains, which it rarely does, the water just falls off wherever it can. That is the case with my roof. The roof is basically designed to "pond" with up to 1/2 inch of water and then it overflows. The final water evaporates. For this reason, I avoid any roof penetration whenever possible. This is why I am beginning with a plan where that will not penetrate my roof at all.
As for my Unistrut frame, my prototype section is only a beginning. I have designed many structures with Unistrut and it is extremely strong. My final frame will be even lower to the surface of the roof than shown. Bruce made a good observation and I responded gratefully.
My original question posted was about clamping solar panels from the "ends" rather than from the "sides". Most all the installations I have seen have used two clamps on each of the long sides. I was wondering if anyone had experience clamping with two clamps on each of the short ends when panels are in portrait mode.
Greg
As I mentioned, I am only in the planning stages.
My roof is extremely strong. It is made of 6 X 12 solid wood beams. I work with structural engineers regularly in my work so I don't have much concern for the actual strength of my roof. I have discussed my with some of them and will continue to do so.
You are right about the system moving around if there is an earthquake. I have lived in this part of the country for over 60 years... I know what goes on. There is a level of protection that is necessary but beyond that, the entire building would fall down and then, who cares. Lateral movement during seismic activity is indeed a problem. I was planning on a stainless steel cable system to keep the system in place. Also, there will be rubber pads between the weights and the roofing material. These will minimize any sliding around during minor temblers.
Codes in this area allow for heavy air conditioners to be placed on rubber isolation pads on flat roofs. My plan is similar. However, codes are not my baseline. Many homes here fell down during past quakes that were homes "made to code".
As I do with my work, my system will be severely over engineered.
Where I live, one cannot get away with un-inspected home improvements. I have lived places where nobody cares what you do to your house, but this area is not that way.
I mentioned before that we have many flat roofs in my area. Most commercial installers lean towards ballasted installations in those cases.
I always like to point out that the term "flat roof" will mean different things to different people. We have roofs in this part of the country that are really flat. I mean zero pitch. Basically, if it rains, which it rarely does, the water just falls off wherever it can. That is the case with my roof. The roof is basically designed to "pond" with up to 1/2 inch of water and then it overflows. The final water evaporates. For this reason, I avoid any roof penetration whenever possible. This is why I am beginning with a plan where that will not penetrate my roof at all.
As for my Unistrut frame, my prototype section is only a beginning. I have designed many structures with Unistrut and it is extremely strong. My final frame will be even lower to the surface of the roof than shown. Bruce made a good observation and I responded gratefully.
My original question posted was about clamping solar panels from the "ends" rather than from the "sides". Most all the installations I have seen have used two clamps on each of the long sides. I was wondering if anyone had experience clamping with two clamps on each of the short ends when panels are in portrait mode.
Greg
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