Roof Covering Classes

The irc addresses roof covering requirements in several areas.

Roof covering classes.

The list of approved laboratories is shown below. Assembly rated class a roof coverings are those that meet class a standards when combined with other elements. Common stand alone class a roof coverings include clay tiles slate asphalt glass fiber composition shingles and concrete tiles. As you contact various contractors or suppliers you should ask about roofing materials that meet ul standard 2218.

The operative word here is systems. Commercial roofing 101 is a free 2 hour demonstrative class focusing on the principles of roofing and the relationship to property management. A class 4 roof covering receives the highest premium credit. 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.

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. Roof coverings that have passed the ul standard 2218 test are classified as either class 1 2 3 or 4. It comes in various grades and colors. The class a brand weighs 2 000 grams class b 500 grams and class c 9 1 4 grams.

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. Failure is defined as the point where the roof deck ignites. A gas flame is cycled on and off. Slate is considered to be the classiest type of roof cover.

To meet class a the test specimen must resist 15 cycles class b eight cycles and class c three cycles. 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. 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. An example of an unrated covering is an untreated wood shake roof.

Under ul 790 roof systems are evaluated for external fire. It is very high quality and very low maintenance with a life expectancy of hundreds of years. Class a provides the best fire resistance and therefore the best protection for your home. Slate roofing is the perfect topping to an elegant home providing amazing textures and style.

Contrary to what many think there are no class a roofing membranes. It is an entirely different test from astm e 84 ul 723 and it includes weathering per the astm d 2898 standard rain test. Participants earn 2 0 cma continuing education credits. The intermittent flame test.

The astm e 108 ul 790 roof coverings test does not produce a flame spread rating. Examples of a class a roof covering include concrete or clay roof tiles fiberglass asphalt composition shingles and metal roofs.