As an engineer I tend to design structures from the top down. First the roof loads, which determine rafters, or trusses, or whatever roof framing members. Then the beams/headers/girders supporting the rafters, then the columns or walls supporting the headers, …
Okay, now let’s do a (free, online) check of the concentrated load situation. Note that I am looking at the concentrated load separately from the uniform 20 psf live load … yeah!, the two loads are not taken to act …
Now let’s check our roof rafter design. Recall that we (I) came up with 2×6 rough sawn (actual dims) stressed to 900 psi, which is probably doable in SP lumber, and likewise doable with 2×6 dimension lumber, but because the …
Designing a roof rafter … (bending stress) … Linda wants a barn-shelter for her goats. Okay – I’ll do it. `Twelve by twenty-four.’ `Let’s go walk the site. It’s got some slope. I’ll make a stepped-barn, each section will be …