Roofing Pitch Standards

Standard guide for establishing a recycle program for roof coverings roofing membrane and shingle materials.

Roofing pitch standards.

Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. For example when the roof is denoted by six and twelve that means a roof that rises six inches each twelve level inches. 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. Conventional roofs are the easiest to construct and you can walk on them safely.

Standard guide for design of sustainable low slope roofing systems. You could also opt for a pvc flat roofing membrane. 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. Some of the most common roof pitch types are conventional slope type roofs designed with pitch ranging from 4 12 to 9 12.

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. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. Roof pitches exceeding the level of 9 12 or approximately 37 degrees are termed steep slope roofs. You can also calculate roof pitch even without using a roof slope calculator.

Astm d450 standard specification for coal tar pitch used in roofing dampproofing and waterproofing provides a classification for two types of coal tar bitumen. E2396 e2396m 19. These are utilized in residential applications. When it is called four and twelve roofs that mean a roof that rises four inches each twelve level inches.

Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled. 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. Type ii coal tar pitch is intended for below grade waterproofing applications. Type i coal tar pitch is intended for use in built up roof membrane construction.

Standard guide for selection of membranes used in vegetative roofing systems. Pitches above 9 12 are very highly angled and are designated steep slope roofs. The new cool roof requirements affect new construction significant repairs of existing roofs re roofing plus additions and alterations of existing buildings and homes. They have a pitch ranging from 4 12 to 9 12.