Sorry, Brian, there was no racking installation on that roof. I installed it in staggard 3 rows at a time and snapped lines every 6 courses. 30# felt underlayment and 4 nails per shingles.
Last year in December we had a windstorm with 75 mph gusts, and I lost 8 shingles. They broke at the nail line. I had it repaired, but next spring I am replacing the whole roof. After 27 years, it’s time. The shingles are so brittle that I could not even use the one’s I had in storage.
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Because
@tsayre3 Marcel might be approaching the vintage status 
today but he is still a pro. 
When I built my shed over the summer, I used 30# felt and 40 year hail/storm resistant shingles. My 17 year old boy couldn’t get any of it even part way up the ladder. He barely could handle carrying a bundle from the truck to the back yard. Granted, the bundles were quite a bit heavier than I remember, but still… 
If you weren’t so hard on them when you shoveled the snow off, they’d last another 27 years. LOL.
OK just kidding, but still, to be able to actually get pretty much the full life out of them is pretty darn good. Anymore shingles don’t last half as long as they are rated for it seems…
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That was not shoveled, I had used my roof rake which is plastic. No way my wife was going to let me on that roof. LOL
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i don’t think they’re actually as lined up as they appear to be. not to mention you’d have to have nails within an inch or so of them to see any leakage with the slope on the roof.
I’m confused. What do nails have to be within an inch of and what slope of the roof does it need to be to see leakage?
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I think it has to do with the new math Jeff…
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some nice straight lines up there Mr.Cyr…don’t see much of that anymore,
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All I know is that right now the replacement cost is going to be a hell of a lot more than the first time. But guaranteed to be the last one. LOL
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Replaced my roof about 4 years ago. I will sell the house before I replace the roof again…
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i’m talking about the placement of the nails having to do with whether it leaks or not. water tends to follow the path of least resistance, aka flows downhill. if the slope is not very steep, it tends to pool up and flow backwards under the shingle edge, aka laminar flow and wicking. that’s why we don’t use shingles on low slopes. if the shingles have gaps that line up and there are nails within an inch or so of them (the gaps) on a low slope, the water will seep through the nail hole into the sheathing, unless it falls within the area with a self-sealing underlayment.
now all of this is speculation mind you, but seeing what looks like a pretty straight line of gaps on a 27 year old roof with no leaks gets me to assume that unless it was a self-sealing underlayment, the nails were not close enough to them (the gaps) to allow a leak to develop. either that or the slope was great enough to not allow the water to wick under the shingle to the nails.
now to answer the part about what the slope needs to be, well, for that you would have to ask someone with a lot more experience on roofs than me. i just know you don’t line up the gaps and they work better. i don’t like roofs, way too hot for me.
Timothy , did You recently work in the fast food service department ???
yeah, that’s what i do now. how did you know? this inspection crap is just a ruse, a cover so to speak, for my actual career at arby’s. now that you figured it out, what are you gonna do with that information? rat me out? i dare you.
dumbasses anyway.