OK there might be some confusion here on what's meant by "roofer." Roofers as I have always seen the term used means the crew that puts the shingles on.
The roof structure is built by carpenters or framers. Or more likely just delivered as pre-built trusses which are placed on top of the walls.
For a roof built on-site, a speed-square or framing square will include markings for common roofing cuts, hip/valley cuts, etc. You have to know how to use them but you don't really need to understand the underlying trigonometry.
The roof structure is built by carpenters or framers. Or more likely just delivered as pre-built trusses which are placed on top of the walls.
For a roof built on-site, a speed-square or framing square will include markings for common roofing cuts, hip/valley cuts, etc. You have to know how to use them but you don't really need to understand the underlying trigonometry.