These grades also apply to external stairs, handrails and balustrades.

These grades meet or exceed the durability performance requirements set out in NZS 3602:2003 for decking.



Eucalyptus botryoides, E. globoidea, E. microcorys, E. muelleriana, E. obliqua, E. pilularis, E. saligna

Beech - silver, red, black, hard.


Cypress (macrocarpa, lusitanica, Lawsons, Leyland)


All grades:

Decking timber shall be heartwood only (unless sapwood preservative treated to H3.2 as agreed by customer).  

Decay and incipient decay not allowed.

Thickness shall be no less than 25 mm for softwoods and 19mm for hardwoods.

Lengths shall be over 900 mm, with lengths 900-1200 mm comprising no more than 50% of the packet.


Want, wane and skip shall be no more than 5% of the cross section at any point.

Splits not allowed. Shakes not allowed.

Knots, holes, voids, bark-inclusion, bark-pockets, resin pockets, pith, want, wane, skip, sloping grain greater than 1/10 and other weakness-causing defect: Not more than 1/4 of cross section in combination.

Timber must be dried to 20% moisture or below (i.e. air dry) unless a higher moisture content is agreed to.

Premium Decking Grade

Pith not allowed.

Best (top) surface:

Standard Decking Grade

Best (top) surface:

Minimal wane and want allowed on top (better) surface. Minimal skip allowed on the top (better) surface of the profiled product.

General and Responsibilities

At least 95% of the consignment of graded timber shall meet the grade specifications above upon despatch.

Moisture level must be agreed to.

For tallying volumes call dimensions shall be used.

Call sizes (mm) 25 40 50 75 100 125 150 200 225 250 300
Actual dressed dry size (mm) 19 35 45 70 90 115 140 180 205 230 280


Once despatched the seller shall not be responsible for any subsequent deterioration of condition of the timber or defects arising from further processing. 

Farm Forestry Timbers reserve the right to revise our grading rules without notice. Grade revision 1.1 October 2013.

See Glossary for explanation of terms.