Roof Covering Classes

It comes in various grades and colors.

Roof covering classes.

The intermittent flame test. Common stand alone class a roof coverings include clay tiles slate asphalt glass fiber composition shingles and concrete tiles. Class a is the highest rating offering the highest resistance to fire and unrated is the worst. Slate is considered to be the classiest type of roof cover.

The list of approved laboratories is shown below. Participants earn 2 0 cma continuing education credits. Examples of a class a roof covering include concrete or clay roof tiles fiberglass asphalt composition shingles and metal roofs. Roof coverings that have passed the ul standard 2218 test are classified as either class 1 2 3 or 4.

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. It is an entirely different test from astm e 84 ul 723 and it includes weathering per the astm d 2898 standard rain test. 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. 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.

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. Contrary to what many think there are no class a roofing membranes. The class a brand weighs 2 000 grams class b 500 grams and class c 9 1 4 grams. Roof systems are segregated into combustible and non combustible construction types.

Commercial roofing 101 is a free 2 hour demonstrative class focusing on the principles of roofing and the relationship to property management. The operative word here is systems. The irc addresses roof covering requirements in several areas. The preeminence of ul is most likely due to their ansi ul 790 protocol.

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. Slate roofing is the perfect topping to an elegant home providing amazing textures and style. Under ul 790 roof systems are evaluated for external fire. A class 4 roof covering receives the highest premium credit.

Failure is defined as the point where the roof deck ignites. An example of an unrated covering is an untreated wood shake roof. To meet class a the test specimen must resist 15 cycles class b eight cycles and class c three cycles. It is very high quality and very low maintenance with a life expectancy of hundreds of years.

A gas flame is cycled on and off. Assembly rated class a roof coverings are those that meet class a standards when combined with other elements.