EN 771 -4:2011+A1:2015  
 
 Annex D   
This regional  deviation to the EN 771 -4:2011+A1:2015  has been prepared by KWS :  
This deviation contains changes, additions  and deletions as shown in the flowing :  
5 Requirements  for AAC masonry  
Clause 5.5 Compressive strength : added  Table  
 
Compressive strength  and Density  
Strength Class  Compressive Strength (N/mm2) Density Class  Mean Dry Density(kg/m3) 
Min. Mean Value  Min. Single Value  Lower Limit  Upper Limit  
2 2.5 2.0 350 300 350 
400 350 400 
450 400 450 
500 450 500 
550 500 550 
4 5.0 4.0 600 550 600 
650 600 650 
700 650 700 
800 700 800 
6 7.5 6.0 650 600 650 
700 650 700 
800 700 800 
8 10.0 8.0 800 700 800 
900 800 900 
1000  900 1000  
 
Clause 5. 6 Thermal properties : added  Table  
Thermal conductivity  
Strength Class  Compressive Strength (N/mm2) 
ASTM C 518  
EN 1745:2012  Min. Mean Value  Min. Single Value  
300 0.59 0.085  
350 0.68 0.098  
400 0.76 0.110  
450 0.85 0.122  
500 0.93 0.134  
550 1.02 0.15 
600 1.11 0.16 
650 1.18 0.17 
700 1.25 0.18 
750 1.35 0.20 
800 1.46 0.21 
850 1.56 0.23 
900 1.66 0.24 
950 1.73 0.25 
1000  1.80 0.26 
Note:  From ACI 122R -02 , V alore (1980) plotted oven -dry density of straight line that can be expressed by the equation 
{kc=0.072e0.00125d (S.I. units) , where d=oven -dry density in Ib/ft3[kg/m3]} 
 
Clause 5. 9 Water Vapour permeability : added Table  
 
Water Absorption (Optional)  
At time 10 min  Shall be declared by 
the Manufacturer   At time 30 min   
At time 90 min   
 