Technical Aspects of Cypress  
 
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Here are the physical, mechanical and design properties of cypress and  
how they compare to Western Red Cedar, which is used in many of the  
same applications. 
 

  Cypress West. Red Cedar
Specific Gravity .46 .32
Density (lbs/ft cubed) 31.4 22.4
Static Bending-Dry Lumber    
     Modulus of rupture (lbs/in squared) 10,600 7,500
     Modulus of elasticity (millions lbs/in squared) 1.44 1.11
     Work to maximum load (in-lbs/ft cubed) 8.2 5.8
Impact Bending-Dry Lumber    
     Height of drop causing failure (in) 24 17
Compression parallel to grain-Dry Lumber    
     Maximum crushing strength (lbs/in squared) 6,360 4,560
Compression perpendicular to grain-Dry Lumber    
     Fiber stress at proportional limit (lbs/in squared) 730 460
Tension perpendicular to the grain-Dry Lumber    
     Maximum tensile strength (lbs/in squared) 270 220
Shear parallel to grain-Dry Lumber    
     Maximum shearing strength (lbs/in squared) 1000 990
Side Hardness (lbs) 510 350
Flame Spread Rating 145-150 70
  
 
 

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