Roofing Pitch Standards

You can also calculate roof pitch even without using a roof slope calculator.

Roofing pitch standards.

The amount of vertical climb has for every twelve inches of lateral dimension by which roof pitches are represented. Some of the most common roof pitch types are conventional slope type roofs designed with pitch ranging from 4 12 to 9 12. Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled. Type i coal tar pitch is intended for use in built up roof membrane construction.

California roofing codes establish a list of rules that all builders and contractors must adhere to in order to ensure safe building practices within the state. There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12. E2396 e2396m 19. Astm d450 standard specification for coal tar pitch used in roofing dampproofing and waterproofing provides a classification for two types of coal tar bitumen.

The most commonly used roof pitches fall in a range between 4 12 and 9 12. So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. The new cool roof requirements affect new construction significant repairs of existing roofs re roofing plus additions and alterations of existing buildings and homes.

Conventional roofs are the easiest to construct and you can walk on them safely. Roof pitches exceeding the level of 9 12 or approximately 37 degrees are termed steep slope roofs. Standard guide for design of sustainable low slope roofing systems. As of january 1 2010 the california energy commission s updated title 24 building energy efficiency standards for residential and non residential roofing are now in force otherwise know as cool roof.

California roofing laws cover everything from licensure of the roofing company to the types of shingles that must be used to the slope of the roof. You could also opt for a pvc flat roofing membrane. When it is called four and twelve roofs that mean a roof that rises four inches each twelve level inches. Pitches above 9 12 are very highly angled and are designated steep slope roofs.

Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. Standard guide for establishing a recycle program for roof coverings roofing membrane and shingle materials. Type ii coal tar pitch is intended for below grade waterproofing applications. For example when the roof is denoted by six and twelve that means a roof that rises six inches each twelve level inches.