Strength Grading
Softwood
Most carcassing (constructional) softwood is imported already stamped with a strength grade of either C16 or C24. However, there are circumstances when higher quality grades of softwood, which do not normally come pre-graded, are required with a strength grade. For these applications our graders are able to visually strength grade the softwoods as shown in the table below. We can stamp the timber or supply a certificate to show that each piece has achieved the required grade.
| Species | Grading Rule | C14 | C16 | C18 | C22 | C24 |
|---|---|---|---|---|---|---|
| Douglas fir- Larch (Canada, USA) | BS 4978 | GS | SS | |||
| Redwood (imported) | BS 4978 | GS | SS | |||
| Southern pine | BS 4978 | GS | SS | |||
| Western red cedar (imported) | BS 4978 | GS | SS | |||
| Whitewood (imported) | BS 4978 | GS | SS |
Hardwood
Unlike softwood, hardwood is not normally imported strength graded. For applications where this is required, our graders are able to visually strength grade a selection of hardwoods. We can then supply the timber either stamped or with a certificate to show that each piece has met the required grade. These hardwoods include the following:
| Species | Grading Rule | D30 | D40 | D50 | D60 | D70 |
|---|---|---|---|---|---|---|
| Balau | BS 5756 | HS | ||||
| Ekki | BS 5756 | HS | ||||
| Greenheart | BS 5756 | HS | ||||
| Iroko | BS 5756 | HS | ||||
| Oak | BS 5756 | TH1,THB | THA |