This european standard supersedes and exceeds the former british standard bs 6073 class 0 spread of flame rating.
Concrete block wall fire rating.
51 mm thickness can be used in the joints of a 4 hour wall.
A fire resistance rating between the hourly ﬁ re resistance rating periods listed may be determined by linear in terpolation based on the equivalent thickness value of the concrete masonry unit.
Where the required frl does not include a value for structural adequacy e g 60 30 the wall must have a frl for structural adequacy equal to that required for integrity i e to achieve a frl of 60 30 the wall must be designed for 60 60 30.
The rated fire resistive periods for block walls can be determined by knowing this information and complying with table 721 1 2 item number 3 of the international building code ibc ref.
Of concrete masonry to fire is well established by extensive testing to be a function of the type of aggregate used in the manufacture of the masonry units and their equivalent thickness.
The requirements of astm c55 astm c73 astm c90 or astm c744 refs.
Where the required frl does not include a value for structural adequacy e g 60 30 clause 7 5 of as 3700 requires.
Equation 6 is used to compute the fire resistance of precast concrete wall panels constructed from two layer of concrete between which a layer of foam plastic is sandwiched.
Allowing for safe means of egress and a higher fire rating these blocks should no longer be looked at as just standard grey cmu.
203 mm limestone aggregate concrete masonry wall with a maximum control joint width of in.
Refer to table a.
13 mm a 1 in.
All thomas armstrong lightweight dense and airtec aerated blocks and achieve the very best possible resistance to fire rating of class a1 bs en 13501 1 2002.
Fire resistance rating of cmu finish table 721 3 2 95 5 linear interpolation from table 721 3 2 of the florida building code for exposed finish block mix 55.
If the foam plastic thickness is not smaller than 25 mm r n 0 59 in equation 6 is equal to 0 22.
Discover the fire resistance of our concrete blocks within our technical guidance.
Westbrook block is a proud producer of underwriters laboratories ul approved fire rated cmu both light weight and normal weight densities in 2 3 and 4 hour configurations.
Tests have been performed to determine the fire resistance of load bearing and non loadbearing walls of concrete blocks both solid and hollow made with two types of aggregate.
Establish the required fire resistance level frl for the wall.
13 14 6 15 shall apply.
The information from the tests has made it possible to make a more complete assessment of the fire resistance of concrete block walls but some further work is still.