Hollow Concrete Block Wall Fire Rating

Table 1 fire resistance rating period of concrete masonry assemblies refs.

Hollow concrete block wall fire rating.

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. 4 or c 331 ref. Thomas armstrong concrete blocks limited www thomasarmstrong co uk the following tables show the nominal fire resistance periods for our various block types.

Single wythe walls multi wythe walls and wall with surface treatments depend on the influence of grouting and the effect of filling the cores of hollow units with fill materials. The fire resistant rating of masonry walls namely. 203 mm limestone aggregate concrete masonry wall with a maximum control joint width of in. Equivalent thickness in for standard concrete block widths 1cores can be filled with grout loose fill insulation or aggregate meeting astm c 33 ref.

If you fill all the cells. The figures are in accordance with bs 5628 3 and bs en 1996 1 2. Single wythe concrete masonry wall. Concrete masonry fire resistance.

Walls composed of hollow concrete masonry units having a nominal thickness of 8 inches or greater and having a fire resistance rating of at least 2 hours shall be classified as 4 hours when the hollow spaces are completely filled with perlite or vermiculite grout or a material such as expanded slag clay shale slate or sand. 4 hour rating requires a 6 deep lightweight unit 4 hour rating requires an 8 deep normal weight unit. Austral bricks technical manual 1 fire and sound resistance of block masonry page 4 of 14 design of besser wall system for fire step 1 establish requirements establish the required fire resistance level frl for the wall. 1 0 fire 03 1 1 design of walls for fire resistance 03 1 2 general design construction considerations 06 1 3 frl for integrity and insulation 07 1 4 frl for structural adequacy for un reinforced and reinforced masonry 08 2 0 sound 22 2 1 the ncc bca requirements 22 2 2 design of walls for sound insulation 22.

For example for an 8 in. 1 hour rating requires a 6 deep block 2 hour rating requires a 10 deep block if you need to achieve a 4 hour fire rating you can either use a 12 deep lightweight block or you can fill all the core holes with sand grout or perlite. Where the required frl does not include a value for structural adequacy e g 60 30 clause 7 5 of as 3700 requires. 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.

Standard northwest block wall ratings. 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. 1 2 3 aggregate type in the minimum required equivalent thickness in. 51 mm thickness can be used in the joints of a 4 hour wall.