As a practical matter, while Code doesn't require nail (or screw) penetration, if you use the appropriate materials, you will have penetration. Its because the point of the nail or the screw has no holding power, so they want to ensure that the nail or screw is long enough to develop the full holding power thru the material (meaning thickest part of the shaft, all the way thru). Now, typically, depending on engineering, 1 1/4" to 1 1/2" of penetration is considered "adequate" - less with polycarbonates, because polycarbonates can't take the same loads - there about 3/4" is considered fine). Asphault shingls are usually affixed to decking - which is thinner, so they use a lot more nails. So if the material is thicker, you can avoid penetration. 1" thick decking, for instance, instead of 1/2" or 2x4 purlins instead of 1x4s.
Those things increase weight, add nothing to (fastener holding) strength, and drive up costs.
My birds don't hit the screws penetrating from my roofing in my raised coop, and the roof is quite low at the edges. You might be overthinking it.
I've personally done a lot of wiring for someone who is NOT an electrician. Enough to pass several building inspections, and I'm doing my own wiring for my house I'm building. Never failed an inspection. SO much can go wrong, there are so many things to account for in the existing wiring that I would never offer how-to advice on the internet. Except to say that a long-term plan involving an extension cord needs to be reconsidered.
Sorry. I'm sure that's not what you wanted to hear.
Those things increase weight, add nothing to (fastener holding) strength, and drive up costs.
My birds don't hit the screws penetrating from my roofing in my raised coop, and the roof is quite low at the edges. You might be overthinking it.
I've personally done a lot of wiring for someone who is NOT an electrician. Enough to pass several building inspections, and I'm doing my own wiring for my house I'm building. Never failed an inspection. SO much can go wrong, there are so many things to account for in the existing wiring that I would never offer how-to advice on the internet. Except to say that a long-term plan involving an extension cord needs to be reconsidered.
Sorry. I'm sure that's not what you wanted to hear.