About Atlas Concrete Our location The services we offer


Beam and Block Flooring

Load Span Tables
Typical beam layouts
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 1.91 4.86 4.34 4.54 4.14 4.28 3.95 3.28
x300x525 2.04 5.43 4.78 5.06 4.59 4.49 4.30 3.66
x300 2.26 5.50 5.43 5.50 5.20 5.49 4.99 4.25
xx300 2.68 5.50 5.50 5.50 5.50 5.50 5.50 5.50

 

  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 medium weight concrete block 1480kg/m3 underdrawn with plasterboard
  Live 1.5kN/m2 2.0kN/m2 2.5kN/m2 5kN/m2
  SWT Floating Screed Floating

Screed

 Floating Screed Screed
Layout Case kN/m2 0.29 1.33 0.29 1.33 0.29 1.33 1.33
x525 1.91 4.77 4.21 4.47 4.00 4.22 3.81 3.17
x300x525 2.04 5.25 4.69 4.98 4.44 4.70 4.27 3.56
x300 2.26 5.50 5.36 5.50 5.14 5.41 4.29 4.13
xx300 2.68 5.50 5.50 5.50 5.50 5.50 5.50 4.80


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 60mm screed. Assessed in accordance with BS 8110, Atlas Flooring 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 300mm centres 525mm centres
Infill block Floating Screed Floating Screed
(K=0.49W/m2K) 0.36 0.56 0.36 0.56