Can anyone give me a rule of thumb for roof rafter and purlin spacing? i want to build a couple real simple structures with steel roofing: an extension roof off my. Http://www.calculated.com/cmp see how to use the construction master pro calculator by calculated industries to easily do dimensional unit conversions. Use our roofing calculator to measure correctly and determine how much roofing material you need for your project. enter your measurements, rounded to the nearest foot..
Roof rafter lengths how to calculate the length of common rafters. this page explains how to calculate, set-out and cut common rafter lengths used in a gable roof.. Instructions on how to design your own hip roof or gable roof plans by vance hester designs. One of the most commonly used terms in roofing. so what does it mean? roof pitch (or slope) tells you how many inches the roof rises for every 12 inches in depth..