Quick Answer: How Is Flame Spread Rating Calculated?

What is the flame spread rating of drywall?

Surface Burning Characteristics: CertainTeed Type X Gypsum Board has a Flame Spread rating of 15 and Smoke Developed rating of 0, in accordance with ASTM E 84, (UL 723, UBC 8-1, NFPA 255, CAN/ULC-S102)..

What does ASTM E 84 mean?

Standard test method for surface burning characteristicsASTM E 84. Standard test method for surface burning characteristics of of building materials. The flame spread Index and Smoke Developed Index values obtained by the ASTM E 84. test are used by code officials and regulatory agencies in the acceptance of interior finish. materials for various applications.

What is the difference between Class 1 and Class 0 fire rating?

To Summarise: Class 1 – Protects your surface from the spread of flames. Class 0 – Protects your surface from the spread of flames AND limits the amount of heat released from the surface during a fire.

What is Class 3 surface spread of flame?

Class 3 – Surface of medium flame spread. This refers to surfaces on which during the first 1½ mins of test, the spread of flame does not exceed 265mm and the final spread of flame does not exceed 710mm under the relevant test conditions.

What is class O paint?

Class 0 – is an additional level of protection for walls or ceilings where limited combustibility is required in high-risk areas, such as escape routes. To comply with Class O materials must have a Class 1 Surface Spread of Flame and low fire propagation index, in accordance with BS 476 Part 6.

What is a Class A material?

Class A fires involve solid materials of an organic nature such as wood, paper, cloth, rubber and plastics that do not melt. Class B fires involves liquids. … Class D fires involve flammable metals such as magnesium, aluminium, titanium, sodium and potassium.

How is flame spread measured?

The tunnel test measures how far and how fast flames spread across the surface of the test sample. … The resulting flame spread rating (FSR) is expressed as a number on a continuous scale where inorganic reinforced cement board is 0 and red oak is 100. The scale is divided into three classes.

What is the maximum flame spread index for insulation materials?

To those of us who work with thermal and acoustical insulation, however, it seems basic that exposed insulation material should meet the building code requirements of at least being rated 25/50 by ASTM E84, which translates to a Flame Spread Rating of 25 or less and a Smoke Developed Rating of 50 or less in the so- …

What does flame spread 0 mean?

The number indicates the relative rate at which flame will spread over the surface of a material, as compared with flame spread on asbestos-cement board (rated zero) and on red oak (rated 100).

What is class A fire rating mean?

A material rated as Class A would have a lower flame spread, and therefore a better performance rating, than a Class C material. The results of the flame spread test results in a numeric rating. If the numeric value is less than 25, then a Class A flame spread index is assigned.

What is a Class C wall finish?

Class C interior finish materials shall be permitted for wainscotting or paneling of not more than 1,000 square feet of applied surface area in the grade lobby where applied directly to a noncombustible base or over furring strips applied to a noncombustible base and fireblocked as required by Section 803.3. 1.

What does UL 723 mean?

Surface Burning CharacteristicsThe ANSI/UL 723 (ASTM E84) Surface Burning Characteristics of Building Materials test is typically used to determine the relative surface burning characteristics of materials used as coverings for walls and ceilings. … The test provides a means to describe a material’s fire and heat response during a controlled burn.

At what temperature does Styrofoam catch on fire?

When burning, expanded polystyrene behaves like other hydrocarbons such as wood, paper, etc. If EPS is exposed to temperatures above 212° F (100° C), it begins to soften, to contract and finally to melt.

Can you leave foam board insulation exposed?

Q: Can FOAMULAR® be left exposed in interior applications? A: No. To comply with building codes, all foam plastics must be covered with a 15 minute thermal barrier. Gypsum board, ½” thick is a common covering.

Is pink foam board flammable?

“Rigid polyurethane and polyisocyanurate foams will, when ignited, burn rapidly and produce intense heat, dense smoke and gases which are irritating, flammable and/or toxic. … Therefore, foam can be particularly hazardous during construction or renovation, as it is often exposed.

What does smoke developed index mean?

Smoke-developed index (abbreviated SDI) is a measure of the concentration of smoke a material emits as it burns. Like the Flame Spread Index, it is based on an arbitrary scale in which asbestos-cement board has a value of 0, and red oak wood has 100.

What is the fire rating of 5/8 drywall?

1 hourNorm Abram replies: The 5/8-inch, “fire-code” drywall (called Type X) increases a wall’s fire rating to a minimum of 1 hour, from the 30-minute rating for standard ½-inch drywall. And it’s not just thickness that makes the difference.

What is Class A Class 1 fire rating?

With a flame spread of 25 or less, cellulose has a Class 1 Fire rating. Walls with cellulose insulation are one-hour (or greater) fire walls and can help control the spread of fire. It also has a very low smoke development index level.

What does CFL s1 mean?

Cfl – s1. combustible materials – medium contribution to fire. D – s1 d0. D – s2 d0. D – s3 d0.

What is 2hr fire rating?

Does a 2-hour fire rating mean that a building will last for 2-hours in a fire? No. The ratings relate only to the ability of individual components and assemblies in a building to meet the required performance in the standard test.

What is the R value of 1 inch Styrofoam?

Extruded polystyrene (XPS) Easily recognized by its blue, green, or pink color, XPS falls in the middle of the three types of rigid-foam insulation in both cost and R-value (about R-5 per inch). XPS comes unfaced or with a number of different plastic facings.