this example was used in many video not sure who is original. the most common roof in US is 4:12, and the assumption of three force seems just an assumption. I expect a wise person can use real example say 22' span normal load (30 pound) as a realistic example/
this example was used in many video not sure who is original. the most common roof in US is 4:12, and the assumption of three force seems just an assumption. I expect a wise person can use real example say 22' span normal load (30 pound) as a realistic example/