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British Larch Decking

British larch is a tough and naturally durable softwood grown in local woodlands that is suitable for decking. British larch is ideal for tight budgets.




Decking profiles


England and Wales


Prone to splitting

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Technical Specification

  • British larch
  • Larix decidua
  • Legal and well managed forests in England and Wales
  • Supplied by Vastern Timber (
  • Grade : Grade A BS1186-3 1990 Class 2 / EN942:2007 J30 Grade B BS1186-3 1990 Class 3 / EN942:2007 J50
  • Finished thickness of 21mm
  • Overall finished widths 95mm / 140mm
  • Random lengths 1.8mt – 3.6mt+, allowing small % down to 1.5mt
  • Available in various profiles
  • Moisture content of 16 – 20%
  • Durability EN350-2 Moderately Durable. Class 3
  • Supplied uncoated. No treatment required.


British larch ranges in colour from pinky-brown in the heartwood, to creamy-white in the sap band. Depending on the grade, there will be some or many dark brown knots and occasional resin pockets along the length of the board.

British larch weathers relatively slowly, often taking two years to reach a silver-grey patina. Larch is quite consistent and is not reactive, and as such, will weather relatively evenly. North facing locations may weather to a darker grey than those facing South.

Desired service life
Frequently wet 15 yrs.

Movement class

Resistance to impact

Working properties
Good workability. Takes fixings satisfactorily although can be prone to splitting.

570 – 650 Kg / m3

British larch contains resin rather than oil or tannin.


VDEC1 (140mm) / VDEC2 (95mm / 140mm) / VDEC3 (95mm)


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