Fire Retardant Roof Covering Class C

A and b brands consist of a three layer sandwich construction of 3 4 in.

Fire retardant roof covering class c.

Burning a brand on a roof deck. Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram. E108 defines the following conditions. Class c fire resistant roofing material obviously since wildfires and the fire season has become increasingly worse it is important to note the roofing materials that are the lowest rated.

Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating. A standard fire test is used to determine the fire rating of a roof covering. Each requires a spread of flame test and a burning brand test. An exception to this general rule is an aluminum covering.

A fire resistant rating e g a class a class b or class c fire resistant rating. Over non combustible roof decks such as steel poured gypsum or concrete only the spread of flame on the top surface of the roof system is evaluated. Class c roofing provides only light fire protection. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c.

Square sticks nailed together with sticks in the middle later running perpendicular to the outside layers. Wood shake plywood or particle board roof are the most common roofing types listed as class c. These tests may be conducted at ul inc fm global or any other certified testing laboratory. Under such exposures roof coverings of this class are not readily flammable afford a measurable degree of fire protection to the roof deck do not slip from position and pose no flying brand hazard.

If wood shakes and shingles are impregnated with fire retardant chemicals they meet the requirements for a class b fire rating and can meet a class a rating if additional materials are included in the roof assemblies. Class a or i. Certain roof system types can be consid ered class a without testing based on their. Experience maximum flame spread of 13 feet.

Class a designates resistance to relatively severe fire test exposure. Astm e108 defines fire test methods for roof coverings. And class c designates resistance to relatively light fire test exposure. Building codes establish fire resistance requirements for roofs based on the type of construction e g concrete steel wood for the building.

Because of its low melting point it must be tested. Building code fire resistance requirements. Tested roof systems are fire classified class a b or c where the most fire resistant roof assemblies are class a and class c is least resistant. Roofing with a class c rating is able to.

The class c brand is about the size of an ice cube. The flame spread categories are as follows per astm e 84 ul 723. A common misconception about roofs fire ratings is that building codes require class a. Flame spread 25 or less frtw some fr surface coatings class b or ii.

Class b designates resistance to relatively moderate fire test exposure. Class c fire retardant treatment a product that is effective against light fire exposures. Class a b and c designations. Flame through to the underside of a roof deck.