How To Select And Specify Macrocarpa Timber

How To Select And Specify Macrocarpa Timber

When specifying Macrocarpa timber you need to consider both the grade and dryness.

New Zealand Macrocarpa timber comes in a number of different grades, finishes and moisture content.

When specifying Macrocarpa, two things need to be considered:

1. Grade

  •  The quality can be either clears, dressing, or landscaping grade.
  • Clears is a grade free from knots and defects. It is available in most board sizes up to 300×50 although it is difficult to get in bigger sizes.
  • Dressing grade is a grade with small, tight knots and minor defects. It is available green sawn or dry, in most sizes up to 300×50 grade.
  •  Landscaping grade is a lower grade which has knots and defects that make it unsuitable for structural use (unless a more rustic appearance is required). It comes in a range of sizes 50×50, 100×50, 150×50, 200×50. It is usually sold green sawn and used in structures outside.

2. Dry or Green

  • Dry means the timber has been filleted and air dried, usually for a 12-month minimum for timber over 50mm thick. This ensures the timber has shrunk and stabilised. It is difficult to kiln dry Macrocarpa from green, as it suffers from cell collapse, splitting around knots, causing problems with dressing and machining. Larger sizes are not dried – it is better that they dry in place.
  • Green means the timber has recently been milled from the log and has not been dried. It is available in all sizes, especially in the larger sizes.

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