Titanic Submarine Disappearance - a good analysis
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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.