Ul Class A B Or C Roof Coverings

Class b roof assemblies and roof coverings shall be listed and identified as class b by an approved testing agency.

Ul class a b or c roof coverings. To meet class a the test specimen must resist 15 cycles class b eight cycles and class c three cycles. Any ul class a b or c roofing system tgfu or prepared roof covering tfwz layer 2 roof sheathing. Class a designates resistance to relatively severe fire test exposure. Class c roof assem blies are those that are effective against light fire test exposure.

In addition ul classifies materials according to their resistance to wind uplift. Grade c d or sheathing. The astm e 108 ul 790 roof coverings test does not produce a flame spread rating. Class c roof assemblies and roof coverings shall be listed and identified as class c by an approved testing agency.

These are the spread of flame test intermittent flame test and burning brand test. The class a brand weighs 2 000 grams class b 500 grams and class c 9 1 4 grams. Nonclassified roofing is approved material that is not listed as a class a b or. For fire tests of roof coverings and ul 790 standard test methods for fire tests of roof coverings the tests provide the basis for the class a b and c designations.

Ul standard ul 790 edition 8 standard for standard test methods for fire tests of roof coverings edition date. The tendency is to assume that class a roof systems have a class a flame spread and so on but there is no correlation. Materials in this category are rated as class 30 class 60 or class 90 materials. A gas flame is cycled on and off.

1505 4 class c roof assemblies. Section 1505 3 class b roof assemblies class b roof assemblies are those that are effective against moderate fire test exposure. Roof covering materials are also classified into class a class b or class c. Assembly rated class a roof coverings are those that meet class a standards when combined with other elements.

Class b designates resistance to relatively moderate fire test. 15 32 thick wood structural panels min. For example shake roofing with a fire retardant treatment rates class b on its own but achieves a class a rating when combined with specified underlying materials such as type 72 roll roofing material. The standard test methods for fire tests of roof coverings ul 790 astm e 108 includes three key tests to provide fire classification of roof covering materials and systems.

Class a b c roof coverings class a b or c roofing systems are sometimes confused with class a b c i ii iii flame spread categories above. Critical role in achieving class a b or c fire classification of roof assemblies. Code interpretation this code implies that all roof materials that pass the testing provided in the astm e 108 fire testing under the moderate category.