Oak boards and elements

Grade “A”
* 4 sides clear without any defects
* sapwood, heartwood not allowed

Grade “A1”
* 3 sides clear
* up to 2..3 sound knots with max. diameter 10mm per running meter allowed only on bottom face
* sapwood, heartwood not allowed

Grade “B”
* up to 2..3 sound knots with max. diameter 25mm per running meter allowed only on top face
* up to 2..3 dark non-lose knots with max. diameter 15mm per running meter allowed on both faces
* sapwood, heartwood not allowed

Grade “C”
* knots with diameter 35mm allowed on both faces
* up to 1..2 sound knots with max. diameter 50mm per running meter allowed
* heartwood up to 50% length of the board only on bottom face is allowed
* through sapwood is allowed

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