Siberian Larch, Heartwood, Planed Square Edge (PSE) for Cladding or Fencing or Decking (pack)


Our slow grown Siberian Larch is one of the best available in the UK, carefully selected to ensure durability and denseness.

This versatile 21 x 145mm planed square wood is superb for board-on-board cladding, decking, reveals around windows, doors, louvres, corners, fencing slats, and much more.

The wood design has 2 unique planed faces that are reversible: smooth one side and sawn finished the other.

You choose! This Larch will turn a beautiful silvery grey colour if left to weather.

Alternatively, stain finish or maintain its colour with oil.

No additional treatment required for use in cladding, decking and fencing applications above ground.

For fixing cladding or Fencing, we recommend: Timber Cladding Stainless Steel A2 Countersunk Screws 4.0×45 or Annular Ring Stainless Steel Nails 2.65x 50mm


  • Ex 25x150mm Planed Square Siberian Larch SertiWOOD® Heartwood 21x145mm
  • Natural golden brown colour
  • Slow grown and selected for durable heartwood
  • Can be stained, painted or treated with SertiWOOD® for a weathered aesthetic
  • Suitable for both open and closed designs
  • Available in long lengths
  • Suitable for horizontal and vertical applications
  • Sourced from Sustainable Forests and FSC Certified
  • Meets UK and European Cladding Regulations CE Marked to EN14915, BS1186, BS8605
  • Timber Quality is A/B Grade.

Additional information

Weight 30 kg
Unique Profile Reference and Profile Size

Pack length (mtr)

Number of Pieces in a Pack (each)

Linear metres in a Pack

Square metres in a Pack (m2)

Approximate number of Fixings required per Pack

Environmental Certification


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