Wooden Fire Rated Door Construction

- Apr 30, 2019-



Photo 1 shows a sample of the construction of a wooden panel door commonly used in residential and business occupancies. This type of door cannot meet the test for fire rating under NFPA 252 because of the thin cross-sections of its panels where they join the rails and stiles. A modern door such as this one will be made up of many pieces of wood laminated together with the grain running in different directions so that it is less likely to warp. Older doors will be made up of solid wood rails and stiles with thin wood panels in between. Another type of door that cannot meet the test for fire rating under NFPA 252 is the honeycomb core (hollow-core) wood door, commonly used in residential and business occupancies. This door is made up of two thin veneers of wood separated by a honeycomb of thin wood or fiberboard strips.

 

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Photo 2 shows the construction of a slab door with a particle-board core. This type of door is made of a slab of particle board (wood fibers and adhesive) with a wood veneer glued to both faces. This type of door can meet the test for fire ratings up to one hour according to NFPA 252 and is frequently used in fire-rated assemblies in residential and business occupancies.


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Photo 3 shows the construction of a wooden slab door with a gypsum (kalamein) core. This type of door appears similar to a slab door with a particle-board core except that the core is gypsum material like that used in drywall board. This type of door can meet the test for higher levels of fire rating under NFPA 252 than the particle-board core. This March 15, 2013 Page 5 of 5 door type is frequently used in fire-rated assemblies in schools, patient-care facilities, and commercial buildings. It is also manufactured of steel instead of wood veneer and is filled with gypsum material.

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