About Atlas Concrete Our location The services we offer


Beam and Block Flooring

Load Span Tables
Typical beam layouts - 225mm
Ground floors - Clear spans in metres for medium weight concrete block 1480kg/m3
  Live 1.5kN/m2 2.0kN/m2 2.5kN/m2 5kN/m2
  SWT Floating Screed Floating

Screed

 Floating Screed Screed
Layout Case kN/m2 0.16 1.20 0.16 1.20 0.16 1.20 1.20
x525 2.25 7.50 6.73 7.06 6.38 6.66 6.09 5.05
x300x525 2.47 7.50 7.50 7.50 7.09 7.39 6.78 5.65
x300 2.87 7.50 7.50 7.50 7.50 7.50 7.50 6.54
xx300 3.23 7.50 7.50 7.50 7.50 7.50 7.50 7.50

  Live Loadings
1.5kN/m2 Typically domestic houses and flats
2.0kN/m2 Hospital wards, common rooms
2.5kN/m2 Domestic floors carrying stud partitions. Garage floors with mesh in screed
5.0kN/m2 Industrial storage



Subsequent floors - clear spans in metres for block type as shown + 50mm bonded screed underdrawn with plasterboard
  Floor Mass Live 1.5kN/m2 2.0kN/m2 2.5kN/m2 5kN/m2
Block Weight   Medium Dense Medium

Dense

 Medium Dense Medium Dense
Layout Case kg/m2                
x510 M 361
D 402		 6.68 6.43 6.34 6.13 6.05 5.87 5.03 4.92
x285x510 M 383
D 423		 7.41 7.15 7.05 6.83 6.73 6.54 5.63 5.51
x285 M 425
D 460		 7.50 7.50 7.50 7.50 7.50 7.50 6.51 6.40
xx285 M 461
D 486		 7.50 7.50 7.50 7.50 7.50 7.50 7.50 7.45


Live Loadings as above.

 

Floor Mass Fire Resistance
A floor mass of 300kg/m3 can be achieved using medium weight concrete infill blocks 1480kg/m3 together with a 50mm screed. A floor mass of 365kg/m3 may be achieved using dense concrete infill blocks 1960kg/m3 together with a 50mm screed. Assessed in accordance with BS 8110, Atlas Deep Beam will achieve 0.5 hours fire resistance and when underdrawn with 12.5mm plasterboard will have a nominal fire rating of 1hour.


U- values of Atlas Flooring
Medium weight concrete 285mm centres 510mm centres
Infill block Floating Screed Floating Screed
(K=0.49W/m2K) 0.4 0.7 0.4 0.7