Basic tutorials on how to designing a roof structure with rule of thumb.

 

How do you calculate roofing structure? 

To determine the configuration of a roof structure, initially measure the vertical dimension from the apex of the roof to the point at which the roof and the wall intersect, known as the rise. Subsequently, quantify the horizontal distance that extends from the roof's peak to the wall, referred to as the run. Subsequent calculations can be executed either manually or with the aid of a calculator, involving the division of the rise by the run. 

What is the rule of thumb for roof pitch?

The International Building Code suggests a minimum roof pitch ratio of 1/4:12. This ratio indicates that for every 12 inches of the roof's horizontal distance (known as the run), the roof's vertical elevation should increase by a minimum of 1/4 inch. 

What is the rule of thumb for roof trusses?

A common guideline for the spacing of roof trusses is to adhere to a ratio of 1/5 to 1/3 of their overall span. The depth of a truss significantly influences its inherent strength, rigidity, initial cost, and the transportation and erection costs at the job site.