Permitted dimensional deviations

The maximum permitted dimensional deviations from nominal sizes for sawn timber are shown in the following tables:

Maximum permitted dimensional deviation for sawn-surface sawn timber
Dimension		Dimensional deviation
Thickness and width ≤ 100 mm		- 1.0 … + 3.0 mm
Thickness and width ≥ 100 mm		- 2.0 … + 4.0 mm
Length when sorted according to length		- 25 … + 50 mm
Length when cut to the specified size		±2.0 mm

Maximum permitted dimensional deviation for dimensioned sawn timber
Dimension	Dimensional deviation
Thickness and width ≤ 100 mm	±1.0 mm
Thickness and width ≥ 100 mm	±1.5 mm
Length when sorted according to length	- 25 … + 50 mm
Length when cut to the specified size	±2.0 mm

Maximum permitted dimensional deviation for all-round planed sawn timber
Dimension	Dimensional deviation
Thickness ≤ 20 mm	±0.5 mm
Thickness ≥ 20 mm¹	±1.0 mm
Width ≤ 100 mm	±1.0 mm
Width ≥ 100 mm	±1.5 mm
Length when sorted according to length	- 25 … + 50 mm
Length when cut to the specified size	±2.0 mm
1) The maximum permitted dimensional deviation for thickness in floorboards is always ± 0,5 mm

The average values for the actual thickness and width of pieces belonging to a batch of sawn timber cannot, however, be less that the nominal size. In the VII quality, greater dimensional deviations than given above are permitted.