What fire rating is plywood?
What fire rating is plywood?
B rating
Correctly treated plywood should achieve a B rating. Rates the density and opacity of smoke produced by the material, which indicates the level of toxicity. Only three grades can be obtained, s1 – s2 – s3, the order being from lowest to highest opacity.
What is Class I fire rating?
A class 1 fire rating is the best fire rating of materials that can be achieved. Class A fire ratings indicate a flame spread rating somewhere between zero and 25. Materials that fall into Class A or Class 1 include things like brick, gypsum wallboard, and fiber cement exterior materials.
Is plywood a Class C?
Lumber, plywood, and other wood-based materials typically fall into Class B or Class C when tested and evaluated in accordance with ASTM E84. All ratings are based on the ASTM E84 test method.
Can you get fire-retardant plywood?
Fire retardant plywood specially treated with chemicals that act as a physical barrier to fire. The sheet material works by utilizing two mechanisms. One of them is reducing the flammability of fire-resistant plywood by lowering the rate at which flames travel and subsequently slowing down combustion.
What does APA rated plywood mean?
APA Rated Sheathing is rated for use as subfloor, wall, roof, diaphragm and shear wall sheathing. It is suitable for use in a range of construction and miscellaneous applications where strength and stiffness are required. 2.1 Adhesive Bond Classification.
What is a1 plywood?
Applications. Grade A-1 hardwood plywood is a premium product and is considerably more expensive than lesser grades. It is typically specified for use only in applications where both sides of the plywood will be clearly seen, such as cabinet door and drawer fronts and eye level shelves.
What class is plywood?
In the United States, there are four basic softwood (construction) plywood veneer grades you need to worry about: A, B, C and D. Occasionally, you may run into a fifth grade called “C-plugged.” Each sheet will have two grades, such as AC. The first letter is the face veneer grade, and the second is for the back veneer.
What is a Class A fire?
Class A fires are fires involving solids. This type of fuel could be paper and cardboard, common in offices and manufacturing. It could be furniture, or fixtures and fittings. It could even be the structure of the building.
What are class fires?
Class A fires are fires in ordinary combustibles such as wood, paper, cloth, rubber, and many plastics.
What is the fire rating of plywood?
Class A Fire-Rated Plywood Class A is the most desirable category for fire-rated plywood as it indicates a flame spread index of 25 or less. For fire-retardant wood to be substituted for a noncombustible material, it is required to have a Class A rating. Inorganic materials like tile and brick also fall under the Class A category.
What is a fire rated?
Fire-resistance rating. A fire-resistance rating typically means the duration for which a passive fire protection system can withstand a standard fire resistance test. This can be quantified simply as a measure of time, or it may entail a host of other criteria, involving other evidence of functionality or fitness for purpose.
