Verified Timber Grades
Verified Timber can be produced by two types of grading system, machine stress grading and visual grading. Timber graded under both systems is tested in the same way through random sampling and testing on a properly calibrated bending test machine. Rigid pass requirements must be adhered to by all Verified Timber licensees to ensure that standards of strength and stiffness are maintained.
Species | Grade | Bending strength (MPa) |
Compression strength (MPa) |
Tension strength (MPa) |
Modulus of elasticity (GPa) |
Fifth percentile modulus of elasticity (GPa) |
---|---|---|---|---|---|---|
Moisture condition - Dry (m/c = 16%) | ||||||
Radiata Pine & Douglas Fir | VSG10 | 20.0 | 20.0 | 8.0 | 10.0 | 6.7 |
VSG 8 | 14.0 | 18.0 | 6.0 | 8.0 | 5.4 | |
Moisture condition - Green (m/c = 25%) | ||||||
Radiata Pine & Douglas Fir | G8* | 11.7 | 12.0 | 4.0 | 6.5 | 4.4 |
*G8 is a visual grade which has been verified in the green condition for when the timber will be used in a service situation where the moisture condition may be 25% or over. |
Species | Grade | Bending strength (MPa) |
Compression strength (MPa) |
Tension strength (MPa) |
Modulus of elasticity (GPa) |
Fifth percentile modulus of elasticity (GPa) |
---|---|---|---|---|---|---|
Moisture Condition - Dry (m/c = 16%) | ||||||
Radiata Pine & Douglas Fir | MGS15 | 41.0 | 35.0 | 23.0 | 15.2 | 11.5 |
MGS12 | 28.0 | 25.0 | 14.0 | 12.0 | 9.0 | |
MSG10 | 20.0 | 20.0 | 8.0 | 10.0 | 7.5 | |
MSG 8 | 14.0 | 18.0 | 6.0 | 8.0 | 5.4 | |
MSG 6 | 10.0 | 15.0 | 4.0 | 6.0 | 4.0 |
Note: A producer can offer other species or grades with different stresses and moduli subject to verification in accordance with the standard NZS3622:2004.