Framing Timber - Machine graded
Stress grading is the only way to accurately verify the structural strength of timber. New Zealand has very strict rules and regulations on stress grading (SG), so that each piece of timber under the SG program can be relied upon to perform structurally as expected. SG timber is first visually sorted to make sure it meets the minimum visual criteria and is then passed through either a sonic or mechanical grader to determine each piece of timbers minimum modulus of elasticity.
SG timber is grouped according to this modulus of elasticity and branded so that the SG grade is identified. For example, SG 8 has a minimum modulus of elasticity of 8 GPa.
Examples of Use
- Lintels
- Floor joists
- Roof beam
- General Framing
- Trusses
Number One Framing: F7, Outdoor Premium, Standard and Better. This is a high quality, multi-purpose construction and remanufacturing product that provides both strength, stiffness and appearance depending on application.
Number Two Framing: This product is extensively used as an internal and external chemical- free or treated framing product.
Merch: This grade is commonly used for economy furniture making, defect docking and treated non-structural applications.
Industrial: This is the lowest grade to come out of the radiata pine sawlog. This product is suitable for packaging, pallet manufacture and defect docking.
Number Two Cuttings: This medium yield cuttings grade allows for cross cutting of medium length clear wood for remanufacture. Each piece will yield 70% of its length in clear cuttings that are 600mm and over in length.
Number Three Cuttings: This economy cuttings grade allows for cross cutting of short length clear wood for remanufacture. Each piece shall yield 60% of its length in clear cutting that are 250mm and over in length.
Framing Timber - Visual Graded For timber characteristics
Visual grading is commonly used where the timber is required to have a set knot ratio or is used in an appearance application.
In a visual grading process, a trained grader examines each and every piece of timber produced. This visual inspection is undertaken in accordance with either hardwood or softwood visual grading standards, which define rules to the type’s sizes and positions of physical characteristics that are allowed in each grade
The size and position of knots and other potential strength reducing characteristics in each piece is compared with the size and position of these characteristics allowed in the various grading classifications.
The highest grades allow fewer and smaller characteristics in each piece of timber.
Framing Timber - Non Structural
Examples of Use
- Ceiling Framing: A cost effective alternative to structural timber that hasn’t met the grading requirements.
- Temporary Use: Long lasting, cost efficient easy solution for your temporary structures. Perfect for making pallets or bins.
- Concrete Formwork: Non Structural Timber is a good economical option for use in concrete forming.
Non Structural Timber is our low cost option for temporary construction and framework. This grade is timber that has passed through stringent machine stress graders and has not met the high standards.
