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Birch Lumber

Category:

Description

Thickness : 25mm // 32mm // 38mm // 43mm // 50mm // 60mm
Width : 80 and up // 100 and up
Length : 300-950mm // 1000-1700mm // 1800-2000mm // 2100-2400mm // 2500mm and up

Elements
25x25mm // 32x32mm // 38x38mm // 43x43mm // 50x50mm // 60x60mm
Length : 300-550mm // 600-800mm // 850-950mm

 

Tolerances: -0.0mm, +2.0mm on thickness
-0.0mm, +4.0mm on width
-0.0mm, +10.0mm on length
Moistness: fresh cut or KD 6..14%
Volume: up to 600 cbm/month
Quality Requirements:
Grade “A”
  • 4 sides clear without any defects
  • false heartwood not allowed
Grade “B”
  • 3 sides clear
  • up to 2..3 knots with max. diameter 15mm per running meter allowed only on bottom face
  • false heartwood not allowed
Grade “C”
  • 1..3 faces clear
  • up to 2..3 sound knots with max. diameter 15mm per running meter allowed only on bottom face
  • false heartwood on bottom face is allowed up to 50% of the thickness of the element
Grade “Rustic”
  • up to 2..3 sound knots with max. diameter 40mm per running meter allowed on both faces
  • up to 1..2 dark knots with max. diameter 25mm per running meter allowed on both faces
  • false heartwood allowed without limitations
General
Requirements:
  • rot, insects, wormholes not allowed
  • face, end and edge cracks not allowed
  • ring shakes not allowed