CLT C24 laminations (EN 16351) - Design Values
CLT C24 laminations (EN 16351) is a cross-laminated timber (clt) grade with reference design values to EN 16351 / EN 338 (C24 laminations). In Eurocode 5 terms its characteristic bending strength fm,k is 24 N/mm², compression parallel fc,0,k is 21 N/mm², and mean modulus E0,mean is 11 kN/mm² (EN 338 / EN 14080). Values are shown before adjustment factors; apply the relevant NDS C-factors or EC5 k_mod and γ_M for your load case.
Representative values. Based on C24 laminations (EN 338). Effective panel bending/shear stiffness follows the shear-analogy method for the specific layup - use the manufacturer's ETA or a design engine.
| fm,k | Bending strength | 24 N/mm² |
| ft,0,k | Tension parallel | 14.5 N/mm² |
| fc,0,k | Compression parallel | 21 N/mm² |
| fc,90,k | Compression perpendicular | 2.5 N/mm² |
| fv,k | Shear strength | 4 N/mm² |
| E0,mean | Mean MOE parallel | 11 kN/mm² |
| E0,05 | 5th-percentile MOE | 7.4 kN/mm² |
| ρk | Characteristic density | 350 kg/m³ |
| ρmean | Mean density | 420 kg/m³ |
Source: EN 16351 / EN 338 (C24 laminations). Reference values are shown before adjustment factors (NDS C-factors / EC5 k_mod, γ_M) - apply these per your load case in design.
Understanding these values
Under Eurocode 5 CLT C24 laminations (EN 16351) is described by characteristic values: bending fm,k 24 N/mm², shear fv,k 4 N/mm², compression parallel fc,0,k 21 N/mm² and perpendicular fc,90,k 2.5 N/mm². These are 5th-percentile figures, not allowable stresses - divide by the partial factor gamma_M (1.25 for cross-laminated timber (clt) under the recommended values) and multiply by k_mod for the service class and load duration, so the usable strength is materially lower than the number shown.
For CLT C24 laminations (EN 16351) the mean modulus E0,mean is 11 kN/mm², and the 5th-percentile modulus E0,05 used for stability is 7.4 kN/mm². Characteristic density is rho,k 350 kg/m³ with a mean of 420 kg/m³, which is the value that drives fastener and connection capacity rather than any of the strength figures - two grades of similar bending strength can give quite different screw and dowel resistances if their densities differ.
The CLT C24 laminations (EN 16351) figures above are representative of cross-laminated timber rather than of any one manufacturer's product. cross-laminated timber is proprietary: published design values differ between suppliers, and for CLT they also depend on the layup and the panel thickness you actually specify. Use this page for scheme design and take the specific product's evaluation report for the final check.