Table 10 Hardwood’s strength classes (Values in standard reference condition U = 12%).

From: Optimization of roof slope, design and wood strength classes in timber Fink type truss

Class

fc0,k (MPa)

fv0,k (MPa)

Ec0,m (MPa)

ρap (kg/m3)

D20

20

4

10,000

500

D30

30

5

12,000

625

D40

40

6

14,500

750

D50

50

7

16,500

850

D60

60

8

19,500

1000

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