E108 defines the following conditions.
Fire retardant roof covering class c.
Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram.
A common misconception about roofs fire ratings is that building codes require class a.
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.
Building codes establish fire resistance requirements for roofs based on the type of construction e g concrete steel wood for the building.
The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c.
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.
Class a b and c designations.
Flame spread 76 to 200 untreated lumber and plywood frtw must have a flame spread of 25 or less in the 10 minute astm e 84 ul 723 test.
Roofing with a class c rating is able to.
A and b brands consist of a three layer sandwich construction of 3 4 in.
Certain roof system types can be consid ered class a without testing based on their.
A standard fire test is used to determine the fire rating of a roof covering.
Experience maximum flame spread of 13 feet.
These tests may be conducted at ul inc fm global or any other certified testing laboratory.
An exception to this general rule is an aluminum covering.
Class c roofing provides only light fire protection.
Burning a brand on a roof deck.
Flame spread 26 to 75 other fr surface coatings class c or iii.
Installa tion instructions will include use of an additional material under the aluminum covering in order to receive the class a by assembly rating.
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.
Each requires a spread of flame test and a burning brand test.
Square sticks nailed together with sticks in the middle later running perpendicular to the outside layers.
The class c brand is about the size of an ice cube.
Class c fire retardant treatment a product that is effective against light fire exposures.
The flame spread categories are as follows per astm e 84 ul 723.
Flame spread 25 or less frtw some fr surface coatings class b or ii.
Astm e108 defines fire test methods for roof coverings.
Building code fire resistance requirements.
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.
A fire resistant rating e g a class a class b or class c fire resistant rating.
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.
And class c designates resistance to relatively light fire test exposure.
Wood shake plywood or particle board roof are the most common roofing types listed as class c.
Because of its low melting point it must be tested.
Class a designates resistance to relatively severe fire test exposure.
