Building Material Fire Spread Rating

Fire Ratings of Archaic Materials and Assemblies iii Foreword Older buildings often contain materials that are fire safe but not list-ed in current fire ratings sources. For the purpose of applying flame spread limits to interior finish material NFPA Standard No.

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Building material fire spread rating. The Guideline on Fire Ratings of Archaic Materials and Assemblies. Class E flame spread rating over 500. 101 The Life Safety Code groups flame spread ratings into five classes.

Flame spread rating number is not the rate at which the flame actually spreads along the surface and is not an indication of the fire resistance of the material. Thus flame spread is one of the most tested fire performance properties of a material. Flame Spread Index 0 25 Allowed in Enclosed vertical exits.

This test measures how far and how fast the flames spread across the surface of the test sample. Flame Spread Index 26- 75 Allowed in Exit access corridors. In this test method the 508-mm-wide 732-m-long specimen completes the top of the tunnel furnace.

Reaction to fire tests Spread of flame Part 2. In general the NBCC sets the maximum flame-spread rating for interior wall and ceiling finishes at 150 which can be met by most wood products. The first is based on the ASTM E-84UL 723 Test for Surface Burning Characteristics of Building Materials The second is based on ASTM E-108UL 790 Test for Fire Performance of Roofing Materials.

To achieve a Class 0 Fire Rating products must meet specific British Standards and pass a series of tests designed to test flame spread and propagation. The resulting flame spread rating FSR is expressed as a number on a continuous scale where cement-asbestos board is 0 and red oak is 100. Foam plastic building materials shall have a flame spread index of not more than 75 and a smoke developed index of not more than 450 when tested in accordance with the Tunnel Test ASTM International E 84 Standard Test Method for Surface Burning Characteristics of Building Materials unless other more stringent requirements are mandated by the building code.

How does a product achieve the Class 0 Fire Rating. The tunnel is calibrated to an index of 0 for non-combustible materials and 100 for red oak flooring plank. The lower the FSI rating the better the material is at resisting the spread of flames.

This lack of documentation hin-ders the modernization and reuse of our nations building stock. The International Code Council ICC and affiliate group the International Building Code IBC develop standards related to building construction. The surface ontop of the noncombustible base cant be thicker than 18th inch 32mm b.

Flame spread is primarily a surface burning characteristic of materials and a flame-spread rating is a way to compare how rapid flame spreads on the surface of one material compared to another. The product must first meet the fire propagation requirements as outlined in BS 476-61989A12009. A product must be also be classified as a Class 1 building material for BS 476 - 71997.

Material has a noncombustible base with a surface that doesnt have a flame spread index greater than 50 when tested in accordance with ASTM E84. Where Does Class A Flame Spread Rating Come From. Materials with a flame spread greater than red oak have an FSR greater than 100.

Class B flame spread rating 26-75. These ratings are based on the organizations flame spread index FSIa measure of how quickly a material can burn and spread flames. Materials with Class A Flame Spread Rating are those that hit a certain threshold indicating less flame spread andor slower time to travel as compared to other materials below Class A.

Class D flame spread rating 201-500. Smoke Developed Index 0-450. Flame spread index is less than 25 when tested with ASTM E84 or UL 723 even if the material is cut.

UL 723 ASTM E84 Test for Surface Burning Characteristics of Building Materials ASTM E84 - 15a Standard Test Method for Surface Burning Characteristics of Building Materials. Flame-spread rating requirements are applied in the National Building Code of Canada NBC primarily to regulate interior finishes. Lateral spread on building and transport products in vertical configuration Amendment 1 6060 ISOTC 92SC 1.

Class A flame spread rating 0-25. The flame-spread rating of finish materials to acceptable levels especially for those areas requiring a flame-spread rating no greater than 25. Class C flame spread rating 76-200.

Hourly Fire-Resistance Ratings Flame spread classes roofing classes and hourly ratings are confusing terms and they sometimes get misused. When looking for fire-resistant building materials a Class A Fire Rated label for instance indicates that the material has the highest level of fire resistance. 26 rows Flame-spread used to describe the surface burning characteristics of building materials is.

Numerous flame spread tests are used but the one cited by building codes is ASTM E 84 also known as NFPA 255 and UL 723 the 25-ft tunnel test.