Titanic Submarine Disappearance - a good analysis
(www.youtube.com)
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Ive been in commercial roofing for over 30 years. the biggest thing that popped out to me was when I saw that titanium ring being bonded to the hull.
first thought?
2 different material types, which expand and contract at different rates.
something we have to pay attention to in commercial roofing, especially when we design systems to withstand 100 degrees outside and rainstorm comes through and drops temp by 30 degrees quickly.
we call it thermal shock.
thus you are relying on that adhesive.
crazy
thanks for the post, OP. even better than the video, imo
The 1986 Challenger explosion was due to the unexpectedly cold weather causing the fuel tank o-rings to contract differently than the material they were fitted onto, causing fuel fumes to leak out near the o-rings. The leaking fumes formed a downward stream that got too close to the booster fire at the bottom of the rocket. The fumes ignited and burned back up to the o-rings and into the fuel tanks and then KaBoom.
Wow, forgot about that, but you are 100% correct.
That thermal issue is something us stupid roofers think a lot about, but NASA missed it in that case.
Ive thought about that O ring issue in past and to be honest?
Material science engineers are friggin amazingly smart, but to be in the field and see shiat fail is a whole different ballgame.
Thankfully, i have never installed a roof that failed and killed people, but it does occur.
For those that do not know?
Your shingle roof is never a danger. It is what we call a water shedder.
A flat roof?
Whole different animal. It is what we refer to as a water diverter.
And you better damn well make sure it is properly diverted.
I did some work with a roofing company as a young buck so I appreciate where you’re coming from. Installation on a pitch over 4/12 is tricky but the finished product sheds really well. Under 2/12 and the snow loading becomes a more serious issue.
For sure, so we call anything 3:12 and above high slope, although at 3:12, certain measures need to be taken.
Anything below 3:12 is what we call low slope and that is where water diversion needs to be thought of.
Water weighs a lot. It is super heavy.
So, imagine, a massive rain storm comes through and you now have tons of water not shedding fast enough?
Can the structure support that weight?
That is what we think of when we design low slope roofs.
We want to make sure the building does not collapse on people inside.