Roof pitch formula

About 30 years ago, we did a big apartment job and it was 12/12 three and four stories and all cut up. That is when we pulled the trigger and bought a LOT of pipe scaffold. Best investment we ever made. It doesn't wear out and it makes it safer and faster to do the cut up steep jobs. When you get used to it, it doesn't take all that long to set up and you don't need all the ropes and harnesses either. the debris doesn't hit the ground, you have a place for the tools and materials and the ground stays clean too. OSHA will leave you alone too. I highly recommend it.

For years, I measured plans with the 3-sided ruler technique. Then, after one I underbid, I started using a quick pitch factor measurement to verify my measurements.

I recently had to explain to my grandson what the engineers scale in my desk drawer was for and realized I hadn't used it in his lifetime (he's 10). All plans I have gotten on the computer, I have used the pitch factor method.