توضیحات :
NFPA 256 – Standard Methods of Fire Tests of Roof Coverings
۲۰۰۳ Edition
Chapter 1 Administration
۱-۱* Scope.
These test methods shall measure the relative fire characteristics of roof coverings under a simulated fire originating outside a building.
۱-۲ Purpose.
The tests shall be done to demonstrate the relative performance of materials under the test exposure involved.
۱-۳ Application.
The test methods shall be applicable to roof coverings intended for installation on either combustible or noncombustible decks, when applied as intended for use.
۱-۳-۱ Classes of Tests. Three classes of fire test exposure shall be described.
(A) Class A. Class A tests shall be applicable to roof coverings that are effective against severe test exposure, that afford a high degree of fire protection to the roof deck, that do not slip from position, and that do not present a flying brand hazard.
(B) Class B. Class B tests shall be applicable to roof coverings that are effective against moderate test exposure, that afford a moderate degree of fire protection to the roof deck, that do not slip from position, and that do not present a flying brand hazard.
(C) Class C. Class C tests shall be applicable to roof coverings that are effective against light test exposure, that afford a light degree of fire protection to the roof deck, that do not slip from position, and that do not present a flying brand hazard.
<< ادامه مطلب را در فایل پیوست مطالعه فرمایید >>
