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https://www.gobrick.com/docs/default-source/read-research-documents/technicalnotes/16-fire-resistance-of-brick-masonry.pdf
A fire resistance rating is based on a fire resistance period and usually given in half-hour or hourly increments. As an example, a wall with a fire resistance period of 2 hours and 25 minutes may only attain a fire resistance rating of 2 hours. It is also referred to as a fire rating, fire resistance classification or hourly rating.
https://masonryadvisorycouncil.org/wp-content/uploads/2018/08/September-Whats-Happening-in-Masonry-Fire-Rating.pdf
pants of a room. If the fire rating is actually 2 hours and 25 minutes, it is classi-fied as a 2 hour rated wall. The longest fire rating for a masonry wall is 4 hours. A typical 8” cmu is rated at 2 hours. The rick Industry Associa-tion (IA) at their website www.gobrick.com has a technical note #16 - Fire Resistance of rick Mason-
https://ncma.org/resource/fire-resistance-ratings-of-concrete-masonry-assemblies/
For example, for an 8-in. (203-mm) limestone aggregate concrete masonry wall with a maximum control joint width of ½ in. (13 mm), a 1 in. (25 mm) thickness (measured perpendicular to the face of the wall) of ceramic fiber in the joint can be used in walls with fire resistance ratings up to 3 hours, while a 2 in. (51 mm) thickness can be used in the joints of a 4-hour wall.
https://www.concreteconstruction.net/_view-object?id=00000154-22dd-db06-a1fe-73ddecc50000
construction is considered to be fire-resistant if it has a 4-hour fire rating or can withstand complete combustion of contents without collapse. How ratings are determined On these pages, masonry walls that provide 1-, 2-, 3-, and 4-hour fire rat-ings are shown. These ratings are from the National Institute of Standards and Te c h n o l o g y, the American Insurance
https://www.concreteconstruction.net/_view-object?id=00000154-22db-db06-a1fe-73dbfc0e0000
Because masonry, of course, is noncombustible, masonry assem-blies usually reach the tempera-ture increase criterion first. Although fire tests have been c o n d u c t e d o nm a n ym a s o n r yw a l l s , not all conceivable combinations of unit size, shape, and core area have been tested. However, the fire resistance of untested con-
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