Roof Covering Classes

The irc addresses roof covering requirements in several areas.

Roof covering classes.

It is an entirely different test from astm e 84 ul 723 and it includes weathering per the astm d 2898 standard rain test. The class a brand weighs 2 000 grams class b 500 grams and class c 9 1 4 grams. The operative word here is systems. Class a provides the best fire resistance and therefore the best protection for your home.

The list of approved laboratories is shown below. We recommend having a class a fire rated roof covering but you should understand its limitations particularly those related to edge of roof issues since standard roof tests do not evaluate potential vulnerabilities at these locations. A gas flame is cycled on and off. An example of an unrated covering is an untreated wood shake roof.

Participants earn 2 0 cma continuing education credits. The preeminence of ul is most likely due to their ansi ul 790 protocol. It is a pass fail test under which a product either passes the criteria as a class a b or c roof covering system or it doesn t. Commercial roofing 101 is a free 2 hour demonstrative class focusing on the principles of roofing and the relationship to property management.

Common stand alone class a roof coverings include clay tiles slate asphalt glass fiber composition shingles and concrete tiles. A class 4 roof covering receives the highest premium credit. Examples of a class a roof covering include concrete or clay roof tiles fiberglass asphalt composition shingles and metal roofs. Failure is defined as the point where the roof deck ignites.

The intermittent flame test. Roof systems are segregated into combustible and non combustible construction types. As you contact various contractors or suppliers you should ask about roofing materials that meet ul standard 2218. Contrary to what many think there are no class a roofing membranes.

Fire resistance is covered in section r902 and insulation is addressed in section r906 but the majority of the requirements are presented in section r903 and r904 which address weather protection and materials respectively. Under ul 790 roof systems are evaluated for external fire. The astm e 108 ul 790 roof coverings test does not produce a flame spread rating. Slate is considered to be the classiest type of roof cover.

Assembly rated class a roof coverings are those that meet class a standards when combined with other elements. We will discuss the different roofing systems advantages materials and demographic concerns of roofs and common problems associated with roof failures and how to identify them. Class a is the highest rating offering the highest resistance to fire and unrated is the worst. It is very high quality and very low maintenance with a life expectancy of hundreds of years.

The fire rating of roof coverings is determined for all materials used in code compliant housing and is classified as class a b c or unrated. It comes in various grades and colors.