However, these just aren't employed as a contingency against those infrequent requests for a one-time shipment of a small volume of plywood. The above referenced Design for Code Acceptance thus concludes, "as can be seen from these examples, most tested wood products have a flame spread index less than , making them acceptable under current building codes for a wide range of interior finish uses. There are also some effective on-site treatments that may be applied to finished surfaces. Of all wood products included in the test, only solid Northern White Pine with a range of values from to and solid Ponderosa Pine with a range from to produced results outside the upper limit for Class C. According to their website, www.
Of all wood products included in the test, only solid Northern White Pine with a range of values from to and solid Ponderosa Pine with a range from to produced results outside the upper limit for Class C. The asker of the second probably just wants to know the rating of our untreated panels. As of this writing, only particle board core and medium density fiber board core are available with a Class A rating, and these are subject to quantity restrictions. There are also some effective on-site treatments that may be applied to finished surfaces. In that regard, many building codes and local regulations require a declaration in some form as to the flame spread of wood products used in projects in their jurisdiction. Among the remaining 39, the highest flame spread value was , with an overall range reported among those of 75 to They are determined by exposing the test specimens to a live flame source and plotting the burn over time. The report also lists test results for a total of 29 panel products of various configurations including paper and vinyl overlaid particle board, MDF, hardboard, and hardwood plywood, as well as factory finished hardwood plywood and MDO Douglas Fir plywood. The values thus produced generally represent a comparison to arbitrary flame spread values for asbestos cement board at zero 0 , and red oak flooring at These seemingly redundant but frequently asked questions often generate a certain amount of confusion. One such company with a sound reputation for their experience and knowledge regarding their product quality and code requirements is Firefree Coatings, Inc. However, these just aren't employed as a contingency against those infrequent requests for a one-time shipment of a small volume of plywood. Share your thoughts with us in the comments below. From this data, it is reasonable to conclude that most untreated wood products manufactured by Columbia Forest Products meet the requirements for Class "C. Combine that information with the previously acknowledged fact that wood will burn, and it becomes important to know a little more. It is important that before we begin this discussion we understand the difference between the terms "fire rated" and "fire retardant treated. Wood is also a versatile building material, providing both structural integrity and aesthetic beauty and warmth no pun intended. Any certification based on any actual test would have to state essentially what I have written above, and that is that products "similar" to the ones tested were found to meet Class C. Solid or composite wood panel products may also be available treated in some manner with fire retardant compounds. In fact, wood is probably the most common building material in use today. Numerous tests we have had conducted by an independent testing agency in accordance with ASTM E have all produced similar results. I would highly recommend getting as much information as possible from the treatment manufacturer before attempting this method. The above referenced Design for Code Acceptance thus concludes, "as can be seen from these examples, most tested wood products have a flame spread index less than , making them acceptable under current building codes for a wide range of interior finish uses. There have been a few attempts over time to treat veneer core with fire retardant treatments, all requiring a "blank" to be manufactured with a water proof glue so that they could be pressure treated with the fire retardant compounds in liquid suspension. This test, designated ASTM E, also called the Steiner Tunnel Test, stipulates the equipment design and conditions under which any product shall be tested, whether wood, aluminum, or gypsum board, to name a very few. Past treatments usually left the core with a very high moisture content which often led to instability, warp, core telegraphing, and checking, and as of this writing none are currently in use. This is a relative term referring to the measure by photo cell of the concentration of smoke developed from tested specimens.
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