Limitation of allowable wood defects
The knots are healthy and light-colored, including cracks (width of cracks should not exceed 0.5 mm), fused and partially fused
Rib knots than 2 mm healthy edges
Dark knots that are jointed and partially jointed
Unjointed knots, stapled knots, lapwing knots, rotted, tobacco knots
Knots fallen out, falling out
Cracks are not through: Plate cracks up to 10 mm deep
Flack, chip, scrape, scuff, gouge
Defect of the spike joint
Allowed, up to 35 mm in diameter
Allowed, up to 25 mm in diameter
Allowed, up to 15 mm in diameter
Allowed, up to 8 mm in diameter
With a total length no more than 300 mm
No more than 1/5 of the width or thickness
Not allowed
Allowed 1 pc for 1 meter of the length of the girder with length no more than 4 cm width no more than 2 mm
Within the permissible size deviations
No more than 1 pc with a diameter no more than 4 mm for 1 m length
Within the permissible size deviations