Replying to Avatar The Fertile Crescent

What type of mounts are you using? Are you planning on hitting every rafter? Is there an equation you’re using that makes you think it can’t handle it?
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Stacking Functions 2y ago

I’m using 2 rails of the thinner unistrut with 5 inch lag screws going into every rafter.

I don’t have any equations but think the reinforcements should be sufficient. Generally I tend to overdo it so I never have to mess with it again

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The Fertile Crescent 2y ago

I install residential rooftop solar and we use some equation of wind uplift to determine the number of connection points. I do not know the equation but the majority of our installs are with connection points at 64 or 72 inch spacing. And we use 3.5 inch lags with an L foot bracket providing around 3-4 inches of stand-off space from the roof surface

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Stacking Functions 2y ago

Nice! Yea it’s a balancing act of wanting some air gap to dissipate heat from the roof and creating a sail for the wind to catch lol